pH值和阳离子对环丙沙星与土壤胶体共运移的影响

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Abstract Soil colloids play an important role in the transport and transformation of antibiotics in underground environments, but the transport forms of antibiotics in dissolved and colloidal states have not been fully studied. The co-transport characteristics of ciprofloxacin (CIP) and brown soil colloids under different pH and cationic conditions were studied by static adsorption and column experiments. The results showed that CIP transport was inhibited by brown soil colloids at pH 4.0. At pH 7.0 and 9.0, soil colloids had no significant effect on CIP transport, but some CIP was transported in the colloidal form. Compared with pH, cations (Na⁺/Ca²⁺) had more significant effects on the co-transport of CIP and soil colloids. Except for low NaCl concentration (0.001mol/L), CIP transport was inhibited by large amounts of deposited colloids on the quartz sand. With the increase of ionic strength and cationic valence, the inhibition effect weakened due to the decreased adsorption capacity of CIP on brown soil colloids. Under 0.01mol/L NaCl, CIP was activated with the release of soil colloids as the ionic strength in bulk solution decreased, but this phenomenon did not occur under CaCl₂, which can be explained by the DLVO theory and straining effect. In addition, CIP inhibited the transport of brown soil colloids under all tested conditions due to the increased surface charge heterogeneity and aggregation of colloids. Our findings demonstrated that the mobility of soil colloids and their adsorption capacity jointly determined the influence of colloids on CIP transport, and the antibiotic transport form not just the total amount should be carefully considered as assessing the potential environmental risks of antibiotics.

Key words： colloid ciprofloxacin co-transport quartz sand adsorption

Received: 07 February 2023

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X53

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	LIU Xiao-wen
	SHAO Ming-yan
	XU Shao-hui
	LIN Qing

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LIU Xiao-wen,SHAO Ming-yan,XU Shao-hui等. Effect of pH and cations on co-transport of ciprofloxacin and soil colloids[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4768-4779.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4768

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