Chemical Speciation and Bioavailability最新文献_第6页

Interface interactions between insecticide carbofuran and tea waste biochars produced at different pyrolysis temperatures 不同热解温度下杀虫剂呋喃与茶废生物炭的界面相互作用

Chemical Speciation and Bioavailability Pub Date : 2016-06-22 DOI: 10.1080/09542299.2016.1198928

S. S. Mayakaduwa, M. Vithanage, A. Karunarathna, D. Mohan, Y. Ok

{"title":"Interface interactions between insecticide carbofuran and tea waste biochars produced at different pyrolysis temperatures","authors":"S. S. Mayakaduwa, M. Vithanage, A. Karunarathna, D. Mohan, Y. Ok","doi":"10.1080/09542299.2016.1198928","DOIUrl":"https://doi.org/10.1080/09542299.2016.1198928","url":null,"abstract":"Abstract Biochars showed a potential as adsorbents for organic contaminants, however, have not been tested for carbofuran, which has been detected frequently in water. This study provides evidences for the use of infused tea residue derived biochar for carbofuran removal. Biochars were produced at 300, 500 and 700 °C by slow pyrolysis and were characterized by proximate and ultimate analysis, FT-IR, SEM, BET and pore size distribution. Pyrolysis temperature showed a pronounced effect on biochar properties. The maximum carbofuran removal was achieved at pH 5. Freundlich and Temkin models best fit the equilibrium data. Biochars produced at 700 °C showed the highest sorption intensity. The adsorption process was likely to be a favorable chemisorption process with electrostatic interactions between carbofuran molecules and biochar surface. Acid-base interactions, electrophilic addition reactions and amide bond formations are the possible mechanisms of carbofuran adsorption. Overall, biochars prepared from tea waste can be utilized as effective adsorbents for removal of aqueous carbofuran.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"28 1","pages":"110 - 118"},"PeriodicalIF":0.0,"publicationDate":"2016-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2016.1198928","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60041070","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: 36

Acute toxicity and gene responses induced by endosulfan in zebrafish (Danio rerio) embryos 硫丹对斑马鱼胚胎的急性毒性和基因反应

Chemical Speciation and Bioavailability Pub Date : 2016-06-13 DOI: 10.1080/09542299.2016.1198681

Y. Moon, Hwang-Ju Jeon, Tae-Hoon Nam, Sung-Deuk Choi, Byung-Jun Park, Y. Ok, Sung-Eun Lee

{"title":"Acute toxicity and gene responses induced by endosulfan in zebrafish (Danio rerio) embryos","authors":"Y. Moon, Hwang-Ju Jeon, Tae-Hoon Nam, Sung-Deuk Choi, Byung-Jun Park, Y. Ok, Sung-Eun Lee","doi":"10.1080/09542299.2016.1198681","DOIUrl":"https://doi.org/10.1080/09542299.2016.1198681","url":null,"abstract":"Abstract Endosulfan has been listed as a persistent organic pollutant, and is frequently found in agricultural environments during monitoring processes owing to its heavy use and persistent characteristics. This study was conducted to understand the effects of endosulfan on the development of zebrafish (Danio rerio) embryos by exposing them to a specific range of endosulfan concentrations. Exposing zebrafish embryos to endosulfan for 96 h yielded no acute toxicity until the concentration reached 1500 μg L−1, whereas malformed zebrafish larvae developed severely curved spines and shortened tails. About 50% of zebrafish larvae were malformed when exposed to 600 μg L−1 of endosulfan. Comparative gene expression using real-time quantitative polymerase chain reaction was assessed using endosulfan-exposed zebrafish embryos. CYP1A and CYP3A were significantly enhanced in response to endosulfan treatment. Two genes, acacb and fasn, encoding acetyl-CoA carboxylase b and fatty acid synthase proteins, respectively, were also up-regulated after treating zebrafish embryos with endosulfan. These genes are also involved in fatty acid biosynthesis. The genes encoding vitellogenin and Hsp70 increased in a concentration-dependent manner in embryos. Finally, biochemical studies showed that acetylcholinesterase activity was reduced, whereas glutathione S-transferase and carboxylesterase activities were enhanced in zebrafish embryos after endosulfan treatment. These biochemical and molecular biological differences might be used for tools to determine contamination of endosulfan in the aquatic environment.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"28 1","pages":"103 - 109"},"PeriodicalIF":0.0,"publicationDate":"2016-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2016.1198681","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60041027","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: 20

Sorptive affinity of ionic surfactants on silt loamy soil 离子表面活性剂对粉质壤土的吸附亲和力

Chemical Speciation and Bioavailability Pub Date : 2016-05-20 DOI: 10.1080/09542299.2016.1187578

Xing-chao Qi, Yanli Liu, Xiaohui Sun, Min Zhang, Chengliang Li

{"title":"Sorptive affinity of ionic surfactants on silt loamy soil","authors":"Xing-chao Qi, Yanli Liu, Xiaohui Sun, Min Zhang, Chengliang Li","doi":"10.1080/09542299.2016.1187578","DOIUrl":"https://doi.org/10.1080/09542299.2016.1187578","url":null,"abstract":"Abstract Due to their broad applications, ionic surfactants have already been released into or utilized in soil and environmental systems. However, current understanding on the sorption behavior of surfactants onto soils is still limited. This work systematically investigated the sorption kinetics and isotherms of one cationic surfactant, cetyltrimethylammonium bromide (CTAB), and one anionic surfactant, sodium dodecyl sulfate (SDS), onto a silt loamy soil to determine the governing sorption mechanisms. The pseudo-second-order rate equation described the sorption kinetics data better than the pseudo-first-order rate equation. Experimental data showed that the sorption equilibrium for CTAB and SDS were reached at 24 and 240 h, respectively. Langmuir equation was better than Freundlich equation in simulating the sorption isotherms of CTAB and SDS on the soil. Soil Langmuir maximum sorption capacity of CTAB was much higher than that to SDS. When the experimental temperature increased, the sorption of CTAB and SDS on the soil decreased. In addition, the sorptive process of the surfactants on the soil was spontaneous and exothermal, as indicated by the absolute values of Gibbs free energy and enthalpy. The results also indicated that physical sorption was the dominant mechanism for the sorption of the two surfactants on the soil. Findings from this work are crucial to understand the environmental behaviors of ionic surfactants.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"28 1","pages":"102 - 95"},"PeriodicalIF":0.0,"publicationDate":"2016-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2016.1187578","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60041019","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: 4

Hesperidin, a citrus flavonoid, increases the bioavailability of micronutrients of Gallus domesticus (chicken) eggshell: in vitro study 柑桔类黄酮橙皮苷提高家鸡蛋壳微量营养素生物利用度的体外研究

Chemical Speciation and Bioavailability Pub Date : 2016-05-17 DOI: 10.1080/09542299.2016.1182446

S. Siddique, Shamma Firdous, A. Durrani, Shaista Khan, A. Saeed

{"title":"Hesperidin, a citrus flavonoid, increases the bioavailability of micronutrients of Gallus domesticus (chicken) eggshell: in vitro study","authors":"S. Siddique, Shamma Firdous, A. Durrani, Shaista Khan, A. Saeed","doi":"10.1080/09542299.2016.1182446","DOIUrl":"https://doi.org/10.1080/09542299.2016.1182446","url":null,"abstract":"Abstract The consumption of citrus flavonoid, hesperidin may inhibit the bone loss. The purpose of this study was to evaluate the effect of hesperidin on the bioavailability of Ca, a probable reason to prevent bone loss. Citrus flavonoid (hesperidin) in combination with citric acid and ascorbic acid was scrutinized to estimate the bioavailability of micronutrients from chicken egg shells using in vitro method. Effect of citric acid, ascorbic acid and hesperidin on the bioavailability of minerals (Zn, Fe) and macro elements (Ca, Mg, P) was evaluated and the amounts required to get maximum bioavailability were concluded. The highest bioavailability of Ca, Mg, P, Fe and Zn was 89.25 ± 2.13, 92.28 ± 1.87, 40.32 ± 3.09, 32.81 ± 1.24 and 46.19 ± 0.83%, respectively after the addition of 3 g of citric acid, 100 mg of ascorbic acid and 4 mg of hesperidin per gram of chicken eggshell powder. Citric acid greatly affects the bioavailability of Ca, Mg, P, and Zn, whereas addition of ascorbic acid enhances the bioavailability of Fe, and hesperidin boosts the bioavailability (p < 0.05) of all micronutrients of the chicken eggshells.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"98 1","pages":"88 - 94"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2016.1182446","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60041010","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: 7

Hazard and risk assessment of human exposure to toxic metals using in vitro digestion assay 用体外消化法评估人体接触有毒金属的危害和风险

Chemical Speciation and Bioavailability Pub Date : 2016-05-12 DOI: 10.1080/09542299.2016.1180961

H. Alhadrami, L. Mbadugha, G. Paton

引用次数: 9

Review of progresses on clinical applications of ion selective electrodes for electrolytic ion tests: from conventional ISEs to graphene-based ISEs 离子选择电极在电解离子测试中的临床应用进展综述:从传统的离子选择电极到石墨烯离子选择电极

Chemical Speciation and Bioavailability Pub Date : 2016-04-15 DOI: 10.1080/09542299.2016.1169560

Rongguo Yan, S. Qiu, Lei Tong, Yin Qian

引用次数: 52

Computer-augmented modeling studies of Pb(II) and Cd(II) complexes with maleic acid in ethylene glycol–water mixture 乙二醇-水混合物中Pb(II)和Cd(II)与马来酸配合物的计算机增强模型研究

Chemical Speciation and Bioavailability Pub Date : 2016-04-04 DOI: 10.1080/09542299.2015.1109479

C. Nageswara Rao, Bogi Srinu, V. Gowri Kumari, B. Sailaja

引用次数: 4

Methods and recent advances in speciation analysis of mercury chemical species in environmental samples: a review 环境样品中汞化学物质形态分析方法及进展综述

Chemical Speciation and Bioavailability Pub Date : 2016-03-29 DOI: 10.1080/09542299.2016.1164019

M. Amde, Yongguang Yin, Dan Zhang, Jing-fu Liu

引用次数: 62

Pyrolysis temperature and steam activation effects on sorption of phosphate on pine sawdust biochars in aqueous solutions 热解温度和蒸汽活化对松木屑生物炭吸附磷酸盐的影响

Chemical Speciation and Bioavailability Pub Date : 2016-03-24 DOI: 10.1080/09542299.2016.1165080

Kangyi Lou, A. Rajapaksha, Y. Ok, Scott X. Chang

引用次数: 76

Chemical speciation of cadmium and lead and their bioavailability to cole (Brassica campestris L.) from multi-metals contaminated soil in northwestern China 西北多金属污染土壤中镉、铅的化学形态及其对油菜的生物有效性

Chemical Speciation and Bioavailability Pub Date : 2016-03-16 DOI: 10.1080/09542299.2016.1157005

Yiming Yang, Yu Li, Jihui Zhang

{"title":"Chemical speciation of cadmium and lead and their bioavailability to cole (Brassica campestris L.) from multi-metals contaminated soil in northwestern China","authors":"Yiming Yang, Yu Li, Jihui Zhang","doi":"10.1080/09542299.2016.1157005","DOIUrl":"https://doi.org/10.1080/09542299.2016.1157005","url":null,"abstract":"Abstract A pot experiment was conducted to study the relationship between speciation distribution of cadmium (Cd) and lead (Pb) and their availability to cole (Brassica campestris L.) grown on the Cd–Pb polluted soil in northwest of China. The results showed that Cd in the unpolluted soil was mainly bound to carbonate fraction (F2) and Fe–Mn oxide fraction (F3), and Pb was mainly bound to carbonate fraction (F2) and residual fraction (F5). However, marked change of Cd and Pb fractionation was observed with increasing soil Cd and Pb concentrations, where the concentrations of Cd in F1 (exchangeable fraction), F2 and F3 increased significantly (p < 0.001 for F1, F2 and F3), and Pb in F1, F2, F3 and F4 increased significantly (p < 0.001 for F1, F2, F3 and F4).The correlation analysis between the fraction distribution coefficient of Cd and Pb in the soil and Cd and Pb concentration accumulated in cole showed that both Cd and Pb in F1 fraction in the soil made the greatest contribution on the accumulation of Cd and Pb in cole. Higher bio-concentration factors (BCFs) and translocation factors (TFs) for Cd and lower BCFs and TFs for Pb were observed in the cole, respectively. Cd had higher accumulation in the edible parts of the cole, but Pb had lower accumulation in that. Therefore, Cd has higher risk to human health than Pb when people eat the coles grown in Cd–Pb polluted soil in northwestern China.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"28 1","pages":"33 - 41"},"PeriodicalIF":0.0,"publicationDate":"2016-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2016.1157005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60040641","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: 26