Abstract:The complexation effect between ciprofloxacin (CIP), sulfamerazine (SMR) and perfluorooctanoic acid (PFOA) and typical heavy metal cations (Cu2+, Pb2+, Zn2+, Cd2+) was investigated by automatic potentiometric titration method and the titration curves were used to derive the binding constants logK between the metals and ligands. Aqueous speciation distribution of various metallic complexes at different pH values were then calculated. Results showed that Cu2+ could form stable complexes Cu(cip±)2+、Cu(cip±)22+、Cu(cip-·cip±)+ with CIP and the binding affinity of Cu2+ was much stronger than that of Pb2+, Zn2+ and Cd2+. Four metal cations all could complex with SMR, while with little difference. Since PFOA molecule carried a lot of F atoms, it behaved like strong acid and no significant complexation effect was observed between PFOA and four metal ions.
童非, 顾雪元. 重金属离子与典型离子型有机污染物的络合效应研究[J]. 中国环境科学, 2014, 34(7): 1776-1784.
TONG Fei, GU Xue-Yuan. Study on complexation effect between heavy metal cations and typical ionic organic pollutants. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1776-1784.