摘要：In order to explore the effect of the amphoteric modifier dodecyl dimethyl betaine (BS-12) on the adsorption stability and morphology of copper along River,eight coastal soil samples of Cangxi (CX),Nanbu (CX),Jialing (JL),and Hechuan (HC) from Jialing River,Santai (ST),and Chuanshan (CS) from Fu River,Quxian (QX) and Guangan (GA) from Qu River were choose as the research objects.The adsorption and desorption of copper on original and BS-12 coexisted coastal soil samples were studied by batch treatment,and the morphological changes of copper adsorption were discussed.Results showed that: (1) The adsorption isotherms of Cu2+ on original and BS-12 coexisted soil samples were all accorded with Langmuir model,and the maximum adsorption amount (qm) of Cu2+ changed in 97.28~272.96 mmol/kg.The adsorption capacity of Cu2+on BS-12 coexisted soil was 1.07-2.52 times higher than that of the original soil (except JL).(2) The maximum desorption amount of Cu2+ in the tested soil sample was 5.10-51.05 mmol/kg.The Cu2+ adsorbed by BS-12 coexisted soil was easier to desorb than that in original soil,with the highest desorption rate of 42.8%.(3) Cu absorbed on original and BS-12 coexisted soil were all the highest in carbonate binding form.Cu content in ion exchange form of BS-12 coexisted soil was higher than that of original soil,and Cu content in carbonate binding and Fe-Mn oxidation form was lower than that of original soil (except HC).(4) Cation exchange capacity (CEC) of original soil had a significant positive correlation with qm and carbonate bound copper content,while total organic carbon (TOC) had a significant negative correlation with Fe-Mn oxidation and organic bound copper.The change of pH in BS-12 coexisted soils significantly affected the copper content in ion-exchanged and Fe-Mn oxide forms.Organic bound copper in BS-12 coexisted soil significantly affected by CEC and TOC.
关键词：BS-12;Coastal soil;Cu2+;Adsorption and desorption;Morphological characteristics
