维普中文期刊产品整合服务

Adsorption and desorption of Cu2+ on paddy soil aggregates pretreated with different levels of phosphate

查看全文 作　　者：Jun [1]Dai;Wenqin [2]Wang;Wenchen [3]Wu;Jianbo [1]Gao;Changxun [1]Dong 高影响力作者 机构地区：[1]College of Sciences, Nanjing Agricultural University, Nanjing 210095, China;[2]College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;[3]South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2017年第29卷第5期,共10页高影响力期刊 基　　金：supported by the Science and Technology Support Plan Program of Jiangsu Province(No.BY2016077-03) 摘　　要：Interactions between anions and cations are important for understanding the behaviors of chemical pollutants and their potential risks in the environment.Here we prepared soil aggregates of a yellow paddy soil from the Taihu Lake region,and investigated the effects of phosphate(P) pretreatment on adsorption-desorption of Cu^(2+) of soil aggregates,free iron oxyhydrates-removed soil aggregates,goethite,and kaolinite with batch adsorption method.The results showed that Cu^(2+) adsorption was reduced on the aggregates pretreated with low concentrations of P,and promoted with high concentrations of P,showing a V-shaped change.Compared with the untreated aggregates,the adsorption capacity of Cu^(2+) was reduced when P application rates were lower than 260,220,130 and110 mg/kg for coarse,clay,silt and fine sand fractions,respectively.On the contrary,the adsorption capacity of Cu^(2+) was higher on P-pretreated soil aggregates than on the control ones when P application rates were greater than those values.However,the desorption of Cu^(2+) was enhanced at low levels of P,but suppressed at high levels of P,displaying an inverted V-shaped change over P adsorption.The Cu^(2+) adsorption by the aggregate particles with and without P pretreatments was well described by the Freundlich equation.Similar results were obtained on P-pretreated goethite.However,such P effects on Cu^(2+)adsorption-desorption were not observed on kaolinite and free iron oxyhydrates-removed soil aggregates.The present results indicate that goethite is one of the main soil substances responsible for the P-induced promotion and inhibition of Cu^(2+) adsorption. 关 键 词：Paddy soil AGGREGATES Copper(Ⅱ) Adsorption and desorption
相关文献

参考文献(47)

耦合文献(87)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费