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Cd^(2+)与环丙沙星共存时在石英砂中的吸附特征及作用机理 被引量:4
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作者 孟秀 徐绍辉 林青 《环境科学学报》 CAS CSCD 北大核心 2021年第2期536-547,共12页
为探讨重金属与兽药抗生素共存时在土壤及地下水砂层中的吸附行为及机理,以重金属镉(Cd)和环丙沙星(Ciprfloxacin,CIP)为研究对象,石英砂为介质,通过批平衡实验法,研究不同Cd^(2+)浓度、pH及离子强度等因素下Cd^(2+)与环丙沙星共存时在... 为探讨重金属与兽药抗生素共存时在土壤及地下水砂层中的吸附行为及机理,以重金属镉(Cd)和环丙沙星(Ciprfloxacin,CIP)为研究对象,石英砂为介质,通过批平衡实验法,研究不同Cd^(2+)浓度、pH及离子强度等因素下Cd^(2+)与环丙沙星共存时在石英砂上的吸附行为及其交互影响.结果表明:①环丙沙星在石英砂上的吸附可分为两个阶段,6 h内为快速吸附,6~24 h为慢速吸附,24 h后达到吸附平衡;Cd^(2+)在石英砂上的吸附表现为瞬时吸附,且吸附行为不受环丙沙星浓度的影响;环丙沙星在石英砂上的吸附动力学过程用伪二级动力学模型拟合效果最优,其次是伪一级动力学方程,颗粒内扩散方程拟合效果最差.②不同Cd^(2+)浓度对环丙沙星吸附的影响不同,当Cd^(2+)浓度较低(5、20 mg·L^(-1))时,Cd^(2+)的存在对吸附起促进作用;当Cd^(2+)浓度为100 mg·L^(-1)时,Cd^(2+)的存在对吸附起抑制作用;pH越高,离子强度越大,石英砂对环丙沙星的吸附量越低,而石英砂对Cd^(2+)的吸附则表现为pH越高,吸附量越大,离子强度越高,吸附量越小;不同Cd^(2+)浓度、pH及离子强度对CIP吸附的影响程度与CIP浓度有关,CIP浓度越低,影响越显著;除了pH为7的条件外,CIP对Cd^(2+)在石英砂上的吸附基本没有影响.③Freundlich方程能较好地拟合不同条件下CIP在石英砂中的吸附曲线,R2均大于0.949,且大部分n值在0.326~0.651之间,说明石英砂对CIP的吸附是非线性的.④Cd可与CIP中的羧基(—COOH)和羰基(C=O)发生络合作用形成络合物而被石英砂所吸附. 展开更多
关键词 环丙沙星 石英砂 吸附动力学 影响因素
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Monitoring the levels of brominated and organophosphate flame retardants in passenger cars:Utilisation of car air filters as active samplers
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作者 Long KTran Chang He +7 位作者 Dam Hoang Phuc Leisa-Maree LToms Xianyu Wang meng xiu Jochen FMueller Adrian Covaci Lidia Morawska Phong KThai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期142-150,共9页
Filters in residential and office air conditioning(A/C)systems have been used as sampling devices for monitoring different pollutants.However,cabin air filters(CAFs)in the A/C system of passenger cars have not been ut... Filters in residential and office air conditioning(A/C)systems have been used as sampling devices for monitoring different pollutants.However,cabin air filters(CAFs)in the A/C system of passenger cars have not been utilised for this purpose.In this study,we collected22 used CAFs from passenger cars in Hanoi,Vietnam to analyse for 8 polybrominated diphenyl ethers(PBDEs)and 10 organophosphate esters(OPEs).All the analytes were detected in more than 50%of samples with the exception of BDE153 and BDE154.The average concentrations of∑10OPEs and∑8 BDEs in the captured dust were 2600 and 40 ng/g,respectively with Tris(1-chloro-2-propyl)phosphate(TCIPP)and BDE209 as the dominant congener in OPE and BDE groups,respectively.CAFs are a potential tool to qualitatively assess the levels of semi-volatile chemicals in suspended dust in cars as a screening step for exposure assessment of those chemicals. 展开更多
关键词 Flame retardants Vehicle cabin Air quality Human exposure PBDES OPEs
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