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【期刊论文】Time-dependent degradation and toxicity of the herbicide diclofop-methyl in algal suspensions
蔡喜运, Cai XY, Ye J, Sheng GY, Liu WP
Environ. Sci. Pollut. Res., 2009, 16(4), 459-465,-0001,():
-1年11月30日
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【期刊论文】Mathematical Model for Cyclodextrin Alteration of Bioavailability of Organic Pollutants
蔡喜运, Liu Huihui, Cai Xiyun*, Chen Jingwen
Environmental Science & Technology,-0001,():
-1年11月30日
While many cyclodextrin-based applications have been developed to assess or enhance bioavailability of organic pollutants, the choice of cyclodextrin (CD) is largely empirical, with little consideration of pollutant diversity and environmental matrix effects. This study aimed at developing a mathematical model for quantifying CD alteration of bioavailability of organic pollutants. Cyclodextrin appears to have multiple effects, together contributing to its bioavailability-enhancing property. Cyclodextrin is adsorbed onto the adsorbent matrix to different extents. The adsorbed CD is capable of sequestrating organic pollutants, highlighting the role of a pseudophase similar to solid environmental matrix. Aqueous CD can reduce adsorption of organic pollutants via inclusion complexation. The two effects cancel each other to a certain degree, which determines the levels of organic pollutants dissolved (comprising freely dissolved and CD-included forms). Additionally, the CDincluded form is nearly identical in biological activity to the free form. A mathematical model of one variable (i.e., CD concentration) was derived to quantify effects of CD on the bioavailability of organic pollutants. Model analysis indicates that alteration of bioavailability of organic pollutants by CD depends on both CD (type and level) and environmental matrix. The selection of CD type and amendment level for a given application may be predicted by the model.
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【期刊论文】Relation of diclofop-methyl toxicity and degradation in algae cultures
蔡喜运, Cai XY, Liu WP, Jin MQ, Lin KD
Environ. Toxicol. Chem., 2007, 26(5), 970-975,-0001,():
-1年11月30日
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蔡喜运, Cai XY, Liu WP, Chen SW
J. Agric. Food Chem., 2005, 53(17), 6744-6749,-0001,():
-1年11月30日
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蔡喜运, Yu Zhang, Xiyun Cai, Weina Xiong, Hao Jiang, Haitong Zhao, Xianhai Yang, Chao Li, Zhiqiang Fu, Jingwen Chen
PLoS ONE,-0001,():
-1年11月30日
Effects of pH on adsorption and removal efficiency of ionizable organic compounds (IOCs) by environmental adsorbents are an area of debate, because of its dual mediation towards adsorbents and adsorbate. Here, we probe the pH-dependent adsorption of ionizable antibiotic oxytetracycline (comprising OTCH2+, OTCH±, OTC−, and OTC2−) onto cyclodextrin polymers (CDPs) with the nature of molecular recognition and pH inertness. OTCH± commonly has high adsorption affinity, OTC− exhibits moderate affinity, and the other two species have negligible affinity. These species are evidenced to selectively interact with structural units (e.g., CD cavity, pore channel, and network) of the polymers and thus immobilized onto the adsorbents to different extents. The differences in adsorption affinity and mechanisms of the species account for the pH-dependent adsorption of OTC. The mathematical equations are derived from the multiple linear regression (MLR) analysis of quantitatively relating adsorption affinity of OTC at varying pH to adsorbent properties. A combination of the MLR analysis for OTC and molecular recognition of adsorption of the species illustrates the nature of the pH-dependent adsorption of OTC. Based on this finding, γ-HP-CDP is chosen to adsorb and remove OTC at pH 5.0 and 7.0, showing high removal efficiency and strong resistance to the interference of coexisting components.
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