Environmental Chemistry and Ecotoxicology最新文献

{"title":"Perinatal exposure to PBDE-47 decreases brain glucose metabolism in male adult rats: Associations with shifts in triiodothyronine and neurobehavior","authors":"Qian Sun ,&nbsp;Hui Gao ,&nbsp;Pei Li ,&nbsp;Luming Liu ,&nbsp;Chen Luo ,&nbsp;Jing Li ,&nbsp;Aiguo Wang ,&nbsp;Tao Xia ,&nbsp;Shun Zhang","doi":"10.1016/j.enceco.2024.11.002","DOIUrl":"10.1016/j.enceco.2024.11.002","url":null,"abstract":"<div><h3>Background</h3><div>The brominated flame retardant 2, 2′, 4, 4′-tetrabromodiphenyl ether (PBDE-47) is well known as a developmental neurotoxicant, yet the underlying mechanisms remain elusive. Increasing evidence has demonstrated that brain glucose metabolism perturbation plays a role in neural impairments. Nevertheless, whether this disturbance is involved in PBDE-47-induced neurotoxicity remains unknown.</div></div><div><h3>Objectives</h3><div>To explore the impacts of perinatal PBDE-47 exposure on brain glucose metabolism, and its link to thyroid hormones (THs) levels as well as neurobehavioral changes.</div></div><div><h3>Methods</h3><div>Female Sprague-Dawley rats were orally exposed to PBDE-47 at environmentally relevant levels (0.1, 1.0, and 10.0 mg/kg bw) from pre-pregnancy through weaning of offspring. The male offspring were continued to raise to 88 days after birth for follow-up experiments. Morris water maze and Open field tests were performed to assess the neurobehavioral alterations. The brain glucose metabolism was evaluated using ¹⁸F-labeled fluorodeoxyglucose (¹⁸F-FDG) positron emission tomography. Serum THs levels were measured via enzyme-linked immunosorbent assay.</div></div><div><h3>Results</h3><div>Perinatal exposure to PBDE-47 induced neurobehavioral impairments in adult male rats as evidenced by learning and memory impairments, hyperactivity and anxiety-like behavior. Moreover, positron emission tomography showed that the glucose metabolism in the whole and the specific brain regions were markedly declined. Interestingly, variations in brain glucose metabolism were associated with the increased serum triiodothyronine (T₃) levels, and both were linked to neurobehavioral disorders.</div></div><div><h3>Conclusion</h3><div>Exposure to environmentally related levels of PBDE-47 at critical developmental stages lowers glucose metabolism in the whole brain and in various brain regions, which is associated with behavioral and cognitive deficits in adult male rats. Moreover, the association may be influenced by the disturbance of T₃ homeostasis.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 84-96"},"PeriodicalIF":9.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Associations of polycyclic aromatic hydrocarbons exposure with mortality and effect modification by folate biomarkers in a prospective population","authors":"Siyu Duan ,&nbsp;Kairong Wang ,&nbsp;Chenming Gu ,&nbsp;Junmin Zhu ,&nbsp;Yafei Wu ,&nbsp;Ya Fang","doi":"10.1016/j.enceco.2024.10.009","DOIUrl":"10.1016/j.enceco.2024.10.009","url":null,"abstract":"<div><div>The associations of folate biomarkers and polycyclic aromatic hydrocarbons (PAHs) in the general population remain unclear. Therefore, this study aimed to examine whether folate biomarkers are associated with PAHs, and whether folate biomarkers can mitigate adverse health outcome caused by PAHs. This prospective cohort study included 11,246 participants from the National Health and Nutrition Examination Survey (NHANES), which documented 1,303 deaths over a mean follow-up of 9.1 years. Multivariable linear regression models were used to examine the relationship between urinary individual PAHs and folate biomarkers. Multivariable Cox proportional hazards regression models were used to calculate hazard ratios and 95 % CIs for the associations of PAHs and folate biomarkers with CVDs mortality and all-cause mortality. We found negative associations between folate in red blood cells (RBC) and urinary 1-Hydroxyphenanthrene (percentage change for a 2·7 fold-increase in folate −4.19 %, 95 % CI -5.80 % to −2.56 %CI), 2-Hydroxyfluorene (−6.66 %, −7.84 % to −5.49 %), 3-Hydroxyfluorene (−5.78 %, −6.77 % to −4.78 %)) and 1-Hydroxynapthalene (−2.75 %, −3.48 % to −2.01 %). The associations between serum folate and PAHs were consistent with those observed for RBC folate, and negative associations were also found between serum folate and 2-Hydroxynapthalene (−4.10 %, −5.26 % to −2.94 %). Within the lowest quartile of folate levels in RBC, there are strong associations of 2-Hydroxyfluorene, 3-Hydroxyfluorene, 1-Hydroxynapthalene, and 2-Hydroxynapthalene with elevated risk of CVDs mortality [HRs (95 % CI) &gt;1]. As folate levels in RBC increase to the third and fourth quartiles, these associations no longer exist [HRs (95 % CI) &lt;1, <em>P</em>-interaction&lt;0.05]. The positive associations between urinary PAHs and CVDs mortality are also eliminated as serum folate levels rise [HRs (95 % CI) &lt;1, <em>P</em>-interaction&lt;0.05]. Furthermore, we also found higher levels of folate in both RBC and serum can greatly reduce the adverse impact of 1-Hydroxynapthalene on all-cause mortality. Consistent results were also validated in daily dietary folate and the folic acid supplement intake. Our study highlighted a robust negative relationship between urinary PAHs and folate. Additionally, folate was found to effectively mitigate mortality caused by PAHs, although we did not observe a direct reduction in mortality attributable to folate.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 97-105"},"PeriodicalIF":9.0,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The plastisphere ecology: Assessing the impact of different pollution sources on microbial community composition, function and assembly in aquatic ecosystems","authors":"Muneer Ahmad Malla ,&nbsp;N.L. Malambule ,&nbsp;Isaac D. Amoah ,&nbsp;Jonathan Featherston ,&nbsp;Arshad Ismail ,&nbsp;Faizal Bux ,&nbsp;Sheena Kumari","doi":"10.1016/j.enceco.2024.10.010","DOIUrl":"10.1016/j.enceco.2024.10.010","url":null,"abstract":"<div><div>In aquatic ecosystems microplastics (MPs) provide new habitat for microbes, forming the plastisphere. While, the effect of different pollution sources on microbiome compositions, functions and assembly processes remains largely cryptic, and hence requires further investigation. Thus, in this study microplastic and surrounding water samples were collected from four different locations and performed meta-analysis to evaluate the impact of different pollution sources on microbial community composition, function and assembly in plastisphere and surrounding environment. Results demonstrated that pollution source had a significant effect on microbial diversity (<em>p</em> = 0.0012) and composition (PERMANOVA <em>F =</em> 16.386; <em>R</em>^<em>2</em> = 0.15, <em>p</em> &lt; 0.001) in surface water and plastisphere. Specifically, plastisphere harboured distinct microbial community and recruited unique taxa compared to surface water, suggesting that microplastics serve as new ecological habitats. We observed a clear shift in microbial community composition, with Bacteroidetes being significantly higher in surface water significantly, whereas α- and β-Proteobacteria dominated the plastic surface (<em>p</em> &lt; 0.05). These change in microbial communities were more likely due to unique chemical properties and substrates enrichment on plastic surfaces and different pollution sources. Genes involved in metabolism, signaling, cell motility, vesicular transport energy production and defence were significantly enriched in plastisphere (<em>p</em> = 0.001). The environmental factors such as DO and salinity drive the microbial communities in plastisphere. Niche-based selection process govern assembly in plastisphere microbiome, while as stochastic processes dominated the assembly process in aquatic microbial communities. These finding suggest that trajectory, continued microplastic emission and transport in aquatic ecosystems could pose serious planetary and health issues.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 75-83"},"PeriodicalIF":9.0,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A longitudinal study of mass loads of quaternary ammonium compounds in sludge associated with COVID-19 Stringency Index indicators in Beijing, China","authors":"Bipin Thapa ,&nbsp;Suman Sapkota ,&nbsp;Jingxuan Chen ,&nbsp;Jiawulan Zunong ,&nbsp;Yeerlin Asihaer ,&nbsp;Nourhan M. Khattab ,&nbsp;Menglong Li ,&nbsp;Ding Ding ,&nbsp;Sten H. Vermund ,&nbsp;Mushui Shu ,&nbsp;Yifei Hu","doi":"10.1016/j.enceco.2024.10.004","DOIUrl":"10.1016/j.enceco.2024.10.004","url":null,"abstract":"<div><div>This study estimated population normalized mass loads (PNML) of quaternary ammonium compounds (QACs) including alkyltrimethylammonium chloride (ATMAC), benzylalkyldimethylammonium chloride (BAC), and dialkyldimethylammonium chloride (DADMAC) and assessed their associations with COVID-19 containment policies. We collected daily sludge specimens from five wastewater treatment plants in Beijing from July 2020 to May 2022. Using liquid chromatography-tandem mass spectrometry, we determined QAC concentrations and backward-estimated their PNML. We used COVID-19 Oxford Stringency Index and its metrics to measure containment policies. We analysed the relationship between QACs and containment measures using linear regression models. Among QACs categories, ΣBAC had median PNML of 94.54 μg/person/day, ΣDADMAC had 282.36 μg/person/day, and ΣATMAC had 802.55 μg/person/day. The ΣQACs median PNML was 1186.12 μg/person/day. The PNML of QACs appeared to have general increasing trend over time and were significantly different across seasons. PNML increased on average by 11 μg/person/day (95 % CI: 3.2, 19) for ΣBAC per 10-unit increase in Stringency Index score. Notably, higher stringency levels in three index indicators — workplace closures, internal movement restrictions, and public gathering restriction were positively associated with higher ΣQACs PNML. Sludge derived QACs may reflect the magnitude of disinfectant use at different stages of pandemic control response.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 39-49"},"PeriodicalIF":9.0,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Industrial by-products (ferrous sulfate minerals and stone powder) can serve as amendments to remediate Cd-As paddy soil, alleviating Cd-As accumulation in rice","authors":"Dele Meng ,&nbsp;Shuoyu Li ,&nbsp;Zegui Li ,&nbsp;Zhencheng Li ,&nbsp;Peiyi Huang ,&nbsp;Yongjun Guo ,&nbsp;Huashou Li","doi":"10.1016/j.enceco.2024.10.007","DOIUrl":"10.1016/j.enceco.2024.10.007","url":null,"abstract":"<div><div>Our previous research has shown that industrial by-products such as ferrous sulfate mineral and stone powder as amendments can remediate Cadmium (Cd) and arsenic (As) soil. However, their role in the soil-rice system is unknown. Therefore, this article explored the effects of the combined use of industrial by-products and commercial conditioners on the accumulation of Cd-As in weakly alkaline and acidic soil-rice systems. Potted experiments shown that SL (stone powder+ferrous sulfate mineral) and SLW (stone powder+ferrous sulfate mineral+Weidikang conditioner) could reduce the availability of Cd-As in soil by adjusting soil pH and CEC, increase iron film content on the root surface, strengthening the “barrier” for fixing Cd-As. Brown rice Cd was lower than the national food safety standard of 0.20 mg kg⁻¹ (GB2762–2022). 1 % SLW could reduce brown rice As from 1.24 mg kg⁻¹ to 0.83 mg kg⁻¹. The results of field experiments confirmed the conclusion of pot experiments. SL and SLW not only reduced the accumulation of Cd-As in rice but also significantly increased rice yield by 16.58 % and 11.68 %, respectively. Compared to the two types of conditioning agents sold in the market, the material costs have been reduced by 79.1 % -86.5 % and 12.4 % -43.3 %, respectively. In summary, this study demonstrates that ferrous sulfate minerals and stone powder could efficiently remediate Cd-As pollution in paddy soil under different acid-base conditions, providing an application example for the resource utilization of industrial by-products for the remediation of Cd-As pollution in paddy soil.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 62-74"},"PeriodicalIF":9.0,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biosorption of Vanadium (V) and Chromium (VI) using abscised coconut leaves powder: Equilibrium and continuous packed bed column studies","authors":"Ankita S. Gawas,&nbsp;Poonam R. Sutar,&nbsp;Jyoti S. Gokhale","doi":"10.1016/j.enceco.2024.10.003","DOIUrl":"10.1016/j.enceco.2024.10.003","url":null,"abstract":"<div><div>The presence of heavy metals such as Vanadium (V) and Chromium (VI) in industrial waste are detrimental and toxic to our agricultural systems. Strategies involving the removal of heavy metals from industrial waste are the need of the hour. A low-cost biosorbent using abscised coconut leaves (ACL) was employed for successful biosorption of toxic heavy metals, namely Vanadium and Chromium from industrial waste in this study. The zeta potential, BET surface area, SEM, EDAX, XRD, FTIR characterization of ACL powder was carried out. Maximum adsorption capacities of 46.95 mg·g⁻¹ for V (V) and 40.33 mg·g⁻¹ for Cr (VI) was observed. Equilibrium studies demonstrated that 98 % Vanadium (V) was removed at pH 2 for a sorbent dosage of 10 g·L⁻¹ and 100 mgLl⁻¹ of initial metal ion concentration, whereas 99 % Chromium (VI) was removed at pH 1 for a sorbent dosage 10 g·L⁻¹ and 100 mg·L⁻¹ of initial metal ion concentration. Zeta potential studies further confirmed the involvement of anionic adsorption mechanism for biosorption of heavy metals. Column studies were further carried out to study effect of bed height, metal ion concentration and flow rate. The Yoon Nelson model was found to be the best fit for the breakthrough curve data. Furthermore, the experimental data was also tested for Bed Depth Service Time model, which is useful for the scale up of the process. Considering the abundance of this biosorbent and simple method of preparation, ACL powder can be considered as a promising cost-effective option for heavy metal removal from water.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 50-61"},"PeriodicalIF":9.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment on acute and multigenerational toxicity of 1,3-diphenylguanidine (DPG) on freshwater water fleas (Moina macrocopa): Developmental, reproductive and oxidative stress effects","authors":"Suman Thodhal Yoganandham ,&nbsp;Soo-Yeon Kim ,&nbsp;Younghoon Jang ,&nbsp;Junho Jeon","doi":"10.1016/j.enceco.2024.10.001","DOIUrl":"10.1016/j.enceco.2024.10.001","url":null,"abstract":"<div><div>Tire particles leach 1,3-diphenylguanidine (DPG) into aquatic environments, raising concern about the chemical, and ecological impact. This study investigated the acute and multigenerational chronic effects of DPG on freshwater water fleas (<em>Moina macrocopa</em>), focusing on toxicity, reproductive and growth implications, antioxidant responses and oxidative stress biomarkers. Acute exposure revealed dose-dependent mortality increase with a significant reduction in Chronic exposure to a sub-lethal concentration of 0.5 mg/L DPG across four generations (P0, F1, F2, and F3) demonstrated substantial declines in reproductive output and growth metrics, alongside increased reactive oxygen species (ROS)activity and suppressed antioxidant enzyme activities, including, superoxide dismutase (SOD), catalase (CAT). Glutathione levels (GSH and GSSG) were reduced, with elevated GSH/GSSG ratios suggesting disrupted redox homeostasis. Pearson correlation analysis highlighted significant relationships between DPG presence and physiological and biochemical parameters, indicating a potential cascade of adverse effects stemming from oxidative stress. These findings underscore the ecological risk of DPG exposure, warranting further investigation into its toxicological pathways to protect aquatic ecosystems.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 27-38"},"PeriodicalIF":9.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the ecotoxicity of extracts from sugarcane bagasse biochars activated with zinc chloride","authors":"Júlia Martins Carolino ,&nbsp;Gabrielle Schultz Braz ,&nbsp;Jaqueline do Carmo Lima Carvalho ,&nbsp;Filipe Gomes Fagundes ,&nbsp;Pablo Aislan Freitas e Silva ,&nbsp;Isis Orika Hernandez Rocha ,&nbsp;Marina Costa Patrocínio ,&nbsp;Evaneide Nascimento Lima ,&nbsp;Robson Pereira de Lima ,&nbsp;Magno André de Oliveira ,&nbsp;Augusto César da Silva Bezerra ,&nbsp;Osania Emerenciano Ferreira ,&nbsp;Alan Rodrigues Teixeira Machado","doi":"10.1016/j.enceco.2024.10.002","DOIUrl":"10.1016/j.enceco.2024.10.002","url":null,"abstract":"<div><div>Biochar derived from the pyrolysis of biomass is recognized for its carbon sequestration capacity. By adding physical or chemical activation steps, its properties can be enhanced, resulting in activated or modified biochar. However, investigating the possible toxic effects for safer application is necessary. In this study, we aimed to assess the ecotoxicological effects of extracts from biochars prepared from sugarcane bagasse activated with zinc chloride and heat treated at temperatures ranging from 300 to 1000 °C. Using <em>Artemia salina</em> as an indicator of toxicity, we observed variation in mortality ranging from 27.5 % to 100 % as the temperature varied between 1000 and 300 °C. The leachate from the sample prepared at 300 °C, which had the highest zinc content, presented an LC50 of 0.53 w/v. Phytotoxicity tests with <em>Lactuca sativa</em> revealed that extracts from biochars prepared at lower temperatures presented greater phytotoxicity, with reductions in relative germination, relative average radicle growth and the germination index. These results highlight the need to assess the ecotoxicological risks of activated biochar with zinc chloride. The sensitivities of <em>Artemia salina</em> and <em>Lactuca sativa</em> are promising for detecting these effects, suggesting that they are effective approaches for assessing environmental safety. These findings not only broaden our understanding of the adverse effects of activated biochar but also guide safe and sustainable practices for its future application.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 19-26"},"PeriodicalIF":9.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconstructing the past environmental conditions of southwestern India using estuarine sediment core","authors":"D'’Souza Nishitha ,&nbsp;Keshava Balakrishna ,&nbsp;A.K. Sudheer ,&nbsp;Gaddam Mahesh","doi":"10.1016/j.enceco.2024.09.003","DOIUrl":"10.1016/j.enceco.2024.09.003","url":null,"abstract":"<div><div>Geological archives can be examined via multiple proxies to uncover significant information about historical environmental changes. In comparison to single proxy approach, the use of multiple proxies can provide better resolution of the paleoenvironmental record. Thus, in the present study, to understand the paleoenvironmental conditions in the Kali coast in southwestern India, sedimentological, geochemical and isotopic (²¹⁰Pb, ¹³⁷Cs) proxies were used. The findings demonstrated that, in previous decades, the sedimentation rate varied from 0.5 to 1.0 cm/year under conditions with relatively higher hydrodynamic energy that were more common and fluctuating, allowing for larger sand particle deposition. However, in more recent years, finer particle deposition towards the surface has been observed under conditions with lower and more stable hydrodynamic energy, with a sedimentation rate of 1.87 cm/year. Additionally, the finer fractions displayed a strong correlation with the metal distribution, which was mostly governed by Fe-Mn oxides. Furthermore, it can be revealed that the environment was warm, humid, and marine-like between 1995 and 2000 based on chemical weathering intensity values and Rb/K ratios. A subtle shift to a freshwater habitat with relatively less warm, less humid climate occurred between 2000 and 2020. Therefore, similar research with longer depositional histories coupled with multiple proxies can help predict the future climatic shifts in decadal time scales.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 1-9"},"PeriodicalIF":9.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nanostructured bi-metallic biochar: An innovative approach for arsenic (III) removal from contaminated water","authors":"Tasrina Rabia Choudhury ,&nbsp;Md. Sajjad Hossain Sajib ,&nbsp;Sheikh Fahim Faysal Sowrav ,&nbsp;Shahidur R. Khan ,&nbsp;M. Nur E. Alam ,&nbsp;Md. Nurul Amin","doi":"10.1016/j.enceco.2024.09.002","DOIUrl":"10.1016/j.enceco.2024.09.002","url":null,"abstract":"<div><div>Possessing variable valence states, the element Arsenic (As) is intimidating the quality of the ecology and human health severely. In this study, eliminating As (III) from water-based solutions with great efficiency was done using Bagasse-Mn-Al, a sugarcane bagasse-derived biochar impregnated with Mn and Al. The Bagasse-Mn-Al composite yielded higher removal efficiency towards As (III) than the biochar itself. About 89.53 % of As (III) was removed within 65 min maintaining the very first concentration of As (III) at 400 μg/L, initial pH at 2–2.5, and adsorbent dosage at 0.625 g/L. The Bagasse-Mn-Al composite showed an adsorption potential maximum of 54.945 mg/g which is superior to most of the cheaply synthesized metal-impregnated biochar reported. Results from a variety of characterization techniques indicated that the •OH free radical in the Bagasse-Mn-Al composite mainly contributed to the removal of As (III) where oxidation and complexation were the major mechanisms. With high catalytic efficiency, this cost effectively produced metal-coated biochar showed easy and effective separation of As (III) from aqueous solution. Further, this study focuses on the high potential of Bagasse-Mn-Al adsorbent in the treatment of both ground and wastewater.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 10-18"},"PeriodicalIF":9.0,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}