Chemosphere最新文献

筛选
英文 中文
Per- and polyfluoroalkyl substances in food and beverages: determination by LC-HRMS and occurrence in products from the Belgian market. 食品和饮料中的全氟烷基和多氟烷基物质:通过 LC-HRMS 进行测定以及比利时市场产品中的出现情况。
Chemosphere Pub Date : 2024-10-01 Epub Date: 2024-10-13 DOI: 10.1016/j.chemosphere.2024.143543
Virginie Van Leeuw, Svetlana V Malysheva, Guillaume Fosseprez, Adrien Murphy, Chaymae El Amraoui Aarab, Mirjana Andjelkovic, Nadia Waegeneers, Els Van Hoeck, Laure Joly
{"title":"Per- and polyfluoroalkyl substances in food and beverages: determination by LC-HRMS and occurrence in products from the Belgian market.","authors":"Virginie Van Leeuw, Svetlana V Malysheva, Guillaume Fosseprez, Adrien Murphy, Chaymae El Amraoui Aarab, Mirjana Andjelkovic, Nadia Waegeneers, Els Van Hoeck, Laure Joly","doi":"10.1016/j.chemosphere.2024.143543","DOIUrl":"10.1016/j.chemosphere.2024.143543","url":null,"abstract":"<p><p>Per- and polyfluoroalkyl substances (PFAS) are industrial chemicals encompassing thousands of compounds. Due to their persistent, bioaccumulative and toxic character, PFAS have become environmental contaminants, and exposure to these chemicals may lead to adverse health effects. This study aimed to provide a sensitive analytical method for the quantification of 25 PFAS in food including food for the young population and beverages, and to gather the missing occurrence data for the dietary exposure evaluation for the Belgian population. More than a decade ago, such assessment was performed only for PFOS and PFOA and is currently outdated. For the determination of PFAS in foodstuffs, an extraction based on a \"quick, easy, cheap, effective, rugged, and safe\" (QuEChERS) protocol and combined with a two-step purification using solid-phase extraction (SPE) was optimised. The quantitative analysis was performed by liquid chromatography high-resolution mass spectrometry (LC-HRMS). The method was validated, and the achieved limits of quantification (LOQs) ranged from 0.002 to 0.3 μg/kg, with the exception of HFPO-DA (1 μg/kg). The LC-HRMS analysis of 268 food products from the Belgian market demonstrated that 43% of samples contained at least one PFAS with a maximum of eleven PFAS measured in a stew of wild pork. PFOS was the most detected compound found in 19% of samples, followed by PFBA (18%) and PFOA (15%), while PFTeDA, PFPeS, PFHpS, PFDS, PFUnDS, PFDoDS, PFTrDS, Minor F53B and HFPO-DA were not detected. The concentrations of the different PFAS in commercial food varied from <LOQ to 2.85 μg/kg, with only one crab sample exceeding the maximum level for PFOA set by the Commission Regulation (EU) 2023/915.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":"366 ","pages":"143543"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142483152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sulfur dioxide absorption by novel green solvents of deep eutectic solvents: Modeling screening. 深共晶溶剂的新型绿色溶剂对二氧化硫的吸收:模型筛选。
Chemosphere Pub Date : 2024-10-01 Epub Date: 2024-10-09 DOI: 10.1016/j.chemosphere.2024.143512
Atefe Rajabi, Reza Haghbakhsh, Amir Goshadrou
{"title":"Sulfur dioxide absorption by novel green solvents of deep eutectic solvents: Modeling screening.","authors":"Atefe Rajabi, Reza Haghbakhsh, Amir Goshadrou","doi":"10.1016/j.chemosphere.2024.143512","DOIUrl":"10.1016/j.chemosphere.2024.143512","url":null,"abstract":"<p><p>Sulfur dioxide (SO<sub>2</sub>), produced mainly from the combustion of coal, is the most important cause of acidic rain, skin diseases, and environmental issues. To overcome the environmental problems, SO<sub>2</sub> must be captured on an industrial scale before it is released into the air. In chemical industries, organic solvents are used for partial absorption of SO<sub>2</sub>. However, those organic solvents have negative environmental effects. Thus, proposing environmentally friendly and green solvents for SO<sub>2</sub> absorption is vital for industries. Recently, increased attention has been paid to capturing SO<sub>2</sub> using Deep Eutectic Solvents (DESs) as the most recently introduced category of green solvents. This study performed a comprehensive screening study on the investigation of the performance of various simple and complicated models for SO<sub>2</sub> solubilities in a wide range of different nature DESs. For this purpose, the most updated and largest SO<sub>2</sub> solubility data bank in DESs involving 976 data points for 63 different nature DESs over wide temperature and pressure ranges has been gathered from open literature. For model screening, for the physical absorption models, the performances of SRK and CPA as the simple cubic and complicated sophisticated equations of state, NRTL and UNIQUAC as the well-known activity coefficient models, and for the chemical absorption models, RETM were investigated and compared. For physical absorption models, coupling an equation of state with the UNIQUAC activity coefficient model i.e. CPA-UNIQUAC, SRK-UNIQUAC, and also using simple SRK-SRK models led to the best performances. Compared to all investigated models, RETM as the chemical absorption model showed the best performance with the AARD% value of 12.95. This shows the importance of considering the chemical absorption mechanism for SO<sub>2</sub> absorption by DESs. Finally, general guidelines for using different modeling approaches were proposed to be considered by the researchers.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":" ","pages":"143512"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142402347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Extraction of bio-hydroxyapatite from devilfish (Loricariidae) for the fluoride and cadmium adsorption from water and its feasible photocatalytic properties. 从魔鬼鱼(Loricariidae)中提取生物羟基磷灰石用于吸附水中的氟和镉及其可行的光催化性能。
Chemosphere Pub Date : 2024-10-01 Epub Date: 2024-10-15 DOI: 10.1016/j.chemosphere.2024.143535
Hilda G Cisneros-Ontiveros, Luis F Zubieta-Otero, Nahum A Medellín-Castillo, Alfredo I Flores-Rojas, Mario E Rodriguez-Garcia
{"title":"Extraction of bio-hydroxyapatite from devilfish (Loricariidae) for the fluoride and cadmium adsorption from water and its feasible photocatalytic properties.","authors":"Hilda G Cisneros-Ontiveros, Luis F Zubieta-Otero, Nahum A Medellín-Castillo, Alfredo I Flores-Rojas, Mario E Rodriguez-Garcia","doi":"10.1016/j.chemosphere.2024.143535","DOIUrl":"10.1016/j.chemosphere.2024.143535","url":null,"abstract":"<p><p>In this study, the adsorption capacity of bio-hydroxyapatite (Bio-HAp) from devilfish for the removal of F<sup>-</sup> and Cd(II) from aqueous solutions was investigated. This material was synthesized according to a 2FI factorial experimental design by varying the extraction conditions for Bio-HAp, including the type of pretreatment (alkaline and peroxide), the calcination temperature from 550 to 850 °C, and the sonication process. The maximum adsorption capacities were 8.48 and 83.56 mg g<sup>-1</sup> for F<sup>-</sup> and Cd(II), respectively. Statistical analysis showed the importance of the type of pretreatment, temperature, and sonication for adsorption. The predicted optimal conditions were Bio-HAp extracted from bone with peroxide pretreatment, calcination at 550 °C and sonication. The surface of the Bio-HAp was found to be mesoporous and basic in character. TGA, FT-IR and SEM-EDS characterizations confirmed the presence of F<sup>-</sup> and Cd(II) on the Bio-HAp surface and confirmed the adsorption mechanisms by electrostatic forces, ion exchange, and chemisorption. The Praunitz-Rake model of adsorption isotherm showed better agreement with the equilibrium adsorption data of F<sup>-</sup> and Cd(II) at pH 7. Furthermore, photodegradation experiments showed 100% degradation methylene blue (MB) under natural sunlight. This study indicates an effective photodegradation process, suggesting high adsorption capacity of the samples. The use of devilfish as an adsorbent promises to be a viable and sustainable option for the removal of fluoride and cadmium from water, and for use in photodegradation experiments.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":"366 ","pages":"143535"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142483146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new approach on the management of landfill leachate reverse osmosis concentrate: Solar distillation coupled with struvite recovery and biological treatment. 管理垃圾填埋场沥滤液反渗透浓缩物的新方法:太阳能蒸馏与硬石膏回收和生物处理相结合。
Chemosphere Pub Date : 2024-10-01 Epub Date: 2024-10-18 DOI: 10.1016/j.chemosphere.2024.143574
Konstantinos Tsompanoglou, Athanasia Iliopoulou, Petros Mastoras, Athanasios S Stasinakis
{"title":"A new approach on the management of landfill leachate reverse osmosis concentrate: Solar distillation coupled with struvite recovery and biological treatment.","authors":"Konstantinos Tsompanoglou, Athanasia Iliopoulou, Petros Mastoras, Athanasios S Stasinakis","doi":"10.1016/j.chemosphere.2024.143574","DOIUrl":"10.1016/j.chemosphere.2024.143574","url":null,"abstract":"<p><p>The management of reverse osmosis (RO) concentrate remains a challenging task for operators of Landfill Leachates Treatment Plants. In this article we suggest an integrated treatment scheme for RO concentrate that combines solar distillation, struvite precipitation to reduce ammonia content of the distillate and biological treatment of the supernatant either with mixed cultures of bacteria or with microalgae. Experiments in a pilot-scale solar still, equipped with underfloor heating system, showed that the production rate of the distillate ranged up to 3.17 L/d m<sup>2</sup>. The distillate was characterized by elevated average concentrations of ammonium nitrogen; 2028 mg/L and 1358 mg/L in the two experiments conducted, respectively. A decreasing trend on concentrations of NH<sub>4</sub><sup>+</sup>-N was noticed during these experiments, while the opposite was observed for COD. Struvite recovery experiments showed that the optimum Mg:NH<sub>4</sub>:PO<sub>3</sub> ratio was that of 2:1:5.8. Under these conditions, the NH<sub>4</sub><sup>+</sup>-N removal reached 88%. Further treatment of the process supernatant into a 4-L hybrid sequencing batch reactor with biocarriers and activated sludge achieved NH<sub>4</sub><sup>+</sup>-N removal higher than 98% in Phases C and D, where 450 and 600 mL of supernatant were added, respectively. Similar removal was also observed in a 2-L bioreactor with microalgae Chlorella sorokiniana when 150 mL of struvite supernatant were added (Phase B) while further increase of the amount of added supernatant to 200 mL resulted to a sharp stop of NH<sub>4</sub><sup>+</sup>-N consumption (Phase C). Calculations for a landfill serving 20,000 inhabitants and a daily RO concentrate production of 6 m<sup>3</sup>/d showed that the required area for the construction of the solar still was 1893 m<sup>2</sup> and the volumes of the hybrid and the microalgae reactor were 54 m<sup>3</sup> and 60 m<sup>3</sup>, respectively. The recovered solid material of struvite process, after characterization for heavy metals and organic micropollutants, could be reused to the fertilizers industry.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":"366 ","pages":"143574"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142483122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Temperature-dependent highly active LaCaMgAl2O4 catalyst effect on carbon nanomaterial and hydrogen generation from polymethyl methacrylate plastic. 温度依赖性高活性 LaCaMgAl2O4 催化剂对碳纳米材料和聚甲基丙烯酸甲酯塑料制氢的影响。
Chemosphere Pub Date : 2024-10-01 Epub Date: 2024-10-13 DOI: 10.1016/j.chemosphere.2024.143540
Samikannu Prabu, Madhan Vinu, Kung-Yuh Chiang
{"title":"Temperature-dependent highly active LaCaMgAl<sub>2</sub>O<sub>4</sub> catalyst effect on carbon nanomaterial and hydrogen generation from polymethyl methacrylate plastic.","authors":"Samikannu Prabu, Madhan Vinu, Kung-Yuh Chiang","doi":"10.1016/j.chemosphere.2024.143540","DOIUrl":"10.1016/j.chemosphere.2024.143540","url":null,"abstract":"<p><p>The increasing accumulation of waste polymethyl methacrylate (PMMA) plastics presents a significant environmental challenge, while the demand for renewable energy sources continues to rise. Thermochemical recycling is a prospective technique for converting waste plastics into high-value chemicals, both economically and environmentally. In this work, the catalytic pyrolysis of waste PMMA plastics over LaCaMgAl<sub>2</sub>O<sub>4</sub> nanosheets (NSs) catalyst is being investigated for its potential to produce hydrogen and carbon nanotubes (CNTs) in a two-stage fixed-bed reactor. The yield and purity of the gaseous products, as well as carbon deposition, concerning the effects of temperature during the catalysis process. Additionally, a small portion of LaCa was incorporated into the MgAl<sub>2</sub>O<sub>4</sub> composite in the pre-catalysts under investigation. Analyzing the physicochemical properties of the carbon nanomaterials that form provides valuable insights into the workings of different catalysts. It's noteworthy that LaCaMgAl<sub>2</sub>O<sub>4</sub> NSs showed such large yields of H<sub>2</sub> (82.71 vol% H<sub>2</sub>) and CNTs (388 mg g<sup>-1</sup>) at 750 °C. The LaCaMgAl<sub>2</sub>O<sub>4</sub> NSs catalyst's impressive ability to produce CNTs and H<sub>2</sub> gas at high yields underscores its efficacy and potential for real-world catalytic pyrolysis applications. This study emphasizes the Nanocatalyst's potential for large-scale catalytic pyrolysis operations, providing a workable and efficient way of converting waste plastics into high-value products and renewable energy.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":"366 ","pages":"143540"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142483155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Occurrence of perfluoroalkyl compounds in commercially available baby food produced in different European countries - levels, dietary intake, and exposure assessment. 欧洲各国生产的市售婴儿食品中全氟烷基化合物的含量、膳食摄入量和暴露评估。
Chemosphere Pub Date : 2024-09-01 Epub Date: 2024-08-14 DOI: 10.1016/j.chemosphere.2024.143074
E Pasecnaja, V Bartkevics, D Zacs
{"title":"Occurrence of perfluoroalkyl compounds in commercially available baby food produced in different European countries - levels, dietary intake, and exposure assessment.","authors":"E Pasecnaja, V Bartkevics, D Zacs","doi":"10.1016/j.chemosphere.2024.143074","DOIUrl":"10.1016/j.chemosphere.2024.143074","url":null,"abstract":"<p><p>The presence of per- and polyfluoroalkyl substances (PFASs) in commercial baby food products from various European countries was investigated in this study. A total of 96 samples were collected and analyzed to assess PFASs levels, composition profiles, and potential dietary intake among infants. The results indicated detectable levels of PFASs in the sampled baby food products, with carboxylic acid prevalence over sulfonic acids. Among the various baby food groups studied, dry cereals exhibited the highest PFASs concentrations. This finding emphasizes the need for further monitoring and investigation of PFASs contamination in this specific food category. While the concentrations detected were generally low, they indicated the widespread presence of PFASs in various types of baby food. Furthermore, a preliminary exposure assessment was conducted on the basis of the measured PFASs concentrations, providing an initial insight into the potential exposure levels among infants from three months to three years old. Calculations based on two scenario types revealed the best-case scenario likely underestimating actual exposure, while the worst-case scenario occasionally exceeded the limits set by the governmental institutions. Further research is needed to understand the sources, pathways, and potential health effects of PFASs exposure in this vulnerable population.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":" ","pages":"143074"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141997081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Use of the threshold of toxicological concern (TTC) approach as an alternative tool for regulatory purposes: A case study with an inert ingredient used in pesticide products. 使用毒理学关注阈值 (TTC) 方法作为监管目的的替代工具:农药产品中使用的惰性成分案例研究》。
Chemosphere Pub Date : 2024-09-01 Epub Date: 2024-08-21 DOI: 10.1016/j.chemosphere.2024.143122
Mohamed A Ghorab, David Lieu, Evisabel A Craig
{"title":"Use of the threshold of toxicological concern (TTC) approach as an alternative tool for regulatory purposes: A case study with an inert ingredient used in pesticide products.","authors":"Mohamed A Ghorab, David Lieu, Evisabel A Craig","doi":"10.1016/j.chemosphere.2024.143122","DOIUrl":"10.1016/j.chemosphere.2024.143122","url":null,"abstract":"<p><p>This study investigates the potential of the Threshold of Toxicological Concern (TTC) as an alternative to traditional animal testing in pesticide regulatory risk assessments. The TTC is a principle that establishes exposure threshold values for chemicals with certain structural features, below which there is no appreciable risk to human health. A case study was conducted with α-terpineol, an inert ingredient proposed to be used at low concentrations in pesticide products, to compare a conventional risk assessment using animal data with one using the TTC method. For the conventional risk assessment, animal data showed that there was no toxicity endpoint of concern, which resulted in a qualitative assessment and no risks of concern identified. For the risk assessment using the TTC method, a 5th percentile no-observed-effect level (NOEL) selected based on α-terpineol's Cramer classification was used as a point of departure (POD) for a quantitative risk assessment that resulted in no risks of concern identified. Therefore, the same conclusion was reached with both approaches and α-terpineol is considered safe for use in pesticide products at low concentrations. A comparative analysis was also performed to determine the applicability of the TTC method in calculating potential dietary risk from common pesticide use patterns for chemicals that fall within different Cramer classes. Results showed that use of the TTC method may be feasible for inert ingredient risk assessments when chemicals are used in a pesticide product at concentrations below 1%. This research underscores the TTC as a valuable and robust tool for assessing the potential hazards from inert ingredient use in pesticide formulations, considering factors such as chemical properties and the concentrations at which a chemical may be used in pesticide products. These findings contribute to the ongoing efforts by the United States Environmental Protection Agency (US EPA) to reduce animal testing in chemical safety assessments. The TTC method presents a viable alternative for risk evaluations of chemicals used at low concentrations, with anticipated low exposure, and with a predicted low toxicity potential.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":" ","pages":"143122"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142001577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Organochlorine pesticides and their markers of exposure in serum and urine of children from a nodding syndrome hotspot in northern Uganda, east Africa. 东非乌干达北部点头综合征热点地区儿童血清和尿液中的有机氯农药及其暴露标记物。
Chemosphere Pub Date : 2024-09-01 Epub Date: 2024-08-29 DOI: 10.1016/j.chemosphere.2024.143191
Silver Odongo, Patrick Ssebugere, Peter S Spencer, Valerie S Palmer, Raquel Valdes Angues, Amos Deogratius Mwaka, John Wasswa
{"title":"Organochlorine pesticides and their markers of exposure in serum and urine of children from a nodding syndrome hotspot in northern Uganda, east Africa.","authors":"Silver Odongo, Patrick Ssebugere, Peter S Spencer, Valerie S Palmer, Raquel Valdes Angues, Amos Deogratius Mwaka, John Wasswa","doi":"10.1016/j.chemosphere.2024.143191","DOIUrl":"10.1016/j.chemosphere.2024.143191","url":null,"abstract":"<p><p>Nodding syndrome (NS) is a neurologic disorder of unknown etiology characterized by vertical head nodding that has affected children aged 5-18 years in East Africa. Previous studies have examined relationships with biological agents (e.g., nematodes, measles, and fungi), but there is limited data on the possible contributions of neurotoxic environmental chemicals frequently used as pesticides/insecticides to the development and progression of this disorder. We examined the levels of persistent organochlorine pesticides (OCPs) in children (5-18 years old) from Kitgum District, Northern Uganda. These children previously lived in internally displaced people's (IDP) camps, where they were exposed to various health risks, including contaminated food and water. Exposure to OCPs through contaminated food and water is postulated here as a potential contributor to NS etiology. We analyzed serum (n = 75) and urine (n = 150) samples from children diagnosed with NS, and from seizure-free household controls (HC), and community controls (CC). Samples were extracted using solid-phase extraction (SPE) and extracts were analyzed for OCPs using gas chromatography with a triple quadrupole mass spectrometry (GC-MS/MS). Mean levels of total (∑) ∑OCPs in serum samples from NS, HC and CC subjects were 23.3 ± 2.82, 21.1 ± 3.40 and 20.9 ± 4.24 ng/mL, respectively, while in urine samples were 1.86 ± 1.03, 2.83 ± 1.42, and 2.14 ± 0.94 ng/mL, respectively. Correlation and linear regression analysis indicated that potential markers for ∑hexachlorocyclohexanes (HCHs), ∑chlordane compounds (CHLs), ∑endosulfan and ∑dichlorodiphenyltrichloroethanes (DDTs) were γ-HCH, heptachlor-exo-epoxide, endosulfan-α and p,p'-DDD in NS cases while in controls were α -HCH, heptachlor, endosulfan-α and p,p'-DDE, respectively. Since, in some instances, higher OCP levels were found in controls vs. NS cases, we conclude that exposure to organochlorine pesticides is unlikely to be associated with the etiology of NS.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":" ","pages":"143191"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142115969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microplastic pollution in aquatic ecosystem: A review of existing policies and regulations. 水生生态系统中的微塑料污染:现有政策和法规回顾。
Chemosphere Pub Date : 2024-09-01 Epub Date: 2024-09-02 DOI: 10.1016/j.chemosphere.2024.143221
Muhammad Tariq Khan, Sajid Rashid, Unzile Yaman, Saeed Ahsan Khalid, Asif Kamal, Mushtaq Ahmad, Nasrin Akther, Md Abul Kashem, Md Faysal Hossain, Wajid Rashid
{"title":"Microplastic pollution in aquatic ecosystem: A review of existing policies and regulations.","authors":"Muhammad Tariq Khan, Sajid Rashid, Unzile Yaman, Saeed Ahsan Khalid, Asif Kamal, Mushtaq Ahmad, Nasrin Akther, Md Abul Kashem, Md Faysal Hossain, Wajid Rashid","doi":"10.1016/j.chemosphere.2024.143221","DOIUrl":"10.1016/j.chemosphere.2024.143221","url":null,"abstract":"<p><p>Environmental pollution due to plastic waste is a global challenge causing adverse impacts on the ecosystem and public health. Microplastic (MP) originates at the upstream processes such as industrial and household activities; however, their existence is affecting the downstream environment. Even though many governments and non-government organizations have taken technological and regulatory steps, these current efforts and strategies are insufficient to prevent the MP release in the environment. Thus, a multidisciplinary global approach is required, which must prioritize the reducing of plastic inputs to the environment. To regulate MP levels in the environment, worldwide reformative and preventive strategies are required because the issue is not limited to a single nation or region. In relation to marine plastic waste, a number of multilateral agreements and measures exist at global level. Several regulatory measures have been examined by regulatory bodies with the intention of safeguarding the environment from excessive MP contamination. However, neither of the frameworks in place is specifically made to stop the increased MP pollution in the environment. Therefore, this review focused on the preventive measures taken by the government and non-government organizations for MP control through legislations. The study also critically discussed MP-related policies aiming to increase the viability and efficiency of implementing future plastic management. This review is expected to provide the basic guidelines for formulating MP standards in the environment.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":" ","pages":"143221"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142134721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using ligand regulation, metal replacement, and ligand doping strategies on Zr-FUM to improve methane separation from coalbed gas. 在 Zr-FUM 上使用配体调节、金属置换和配体掺杂策略来改进煤层气中的甲烷分离。
Chemosphere Pub Date : 2024-09-01 Epub Date: 2024-09-02 DOI: 10.1016/j.chemosphere.2024.143253
Yixuan Yu, Yi Zhou, Kunpeng Liu, Baogang Zhao, Yufei Kang, Tianjun Sun
{"title":"Using ligand regulation, metal replacement, and ligand doping strategies on Zr-FUM to improve methane separation from coalbed gas.","authors":"Yixuan Yu, Yi Zhou, Kunpeng Liu, Baogang Zhao, Yufei Kang, Tianjun Sun","doi":"10.1016/j.chemosphere.2024.143253","DOIUrl":"10.1016/j.chemosphere.2024.143253","url":null,"abstract":"<p><p>Developing adsorbents suitable for industrial applications that can effectively enhance the separation of methane (CH<sub>4</sub>) from nitrogen (N<sub>2</sub>) in coalbed gas is crucial to improve energy recovery and mitigate greenhouse gas emissions. In this study, three modification strategies were implemented on Zr-FUM, including ligand regulation, metal replacement, and ligand doping, to synthesize Zr-FDCA, Al-FUM, and Zr-FUM-FA, with the aim of improving the performance of CH<sub>4</sub>/N<sub>2</sub> separation under humid conditions. The results demonstrated that the promotion of robust orbital overlap and strengthened electrovalent bonding on adsorbents can selectively enhance CH<sub>4</sub> adsorption. As a result, Zr-FUM-FA achieved a saturated CH<sub>4</sub> adsorption capacity of 1.37 mmol/g, a CH<sub>4</sub> working window of 307 s, and a CH<sub>4</sub>/N<sub>2</sub> sorbent selection parameter (Ssp) of 47.31, exceeding the performance of most reported adsorbents. Analyses of the pore structure, surface morphology, and functional groups revealed that the presence of an ultramicropore proximity to CH<sub>4</sub>, reduced static resistance, and enhanced electrovalent bond were key factors for CH<sub>4</sub> separation. Grand Canonical Monte Carlo and Density Functional Theory studies indicated that the introduction of -C-H- in FA played a crucial role in enhancing CH<sub>4</sub> adsorption. Optimization of adsorption parameters using the Aspen adsorption package showed that in a dual-adsorbent bed system, the recovery and purity of CH<sub>4</sub> in Zr-FUM-FA reach 99.5% and 97.3%, respectively, providing important theoretical support for the improvement of CH<sub>4</sub> recovery in the pressure swing adsorption process from coalbed gas.</p>","PeriodicalId":93933,"journal":{"name":"Chemosphere","volume":" ","pages":"143253"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142134740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信