摘要
微塑料是一种广受关注的新型污染物.本研究探讨了老化前后的聚氯乙烯(PVC)微塑料(PVC微塑料)与镉(Cd)对小麦的联合毒性.自然光解老化后的PVC微塑料表面发生C—Cl键断裂并伴随C=O的生成,而C=O的出现提高了PVC微塑料表面的亲水性,进一步提高了老化PVC微塑料对Cd的吸附量.根据小麦生长发育期间叶和根生物量的差异,评估PVC微塑料对Cd毒性作用,研究结果发现,原始和老化的PVC微塑料不影响Cd对小麦叶的毒性,但是老化后的PVC微塑料可以提高低浓度Cd对小麦根的生长抑制作用.老化PVC微塑料与Cd的协同效应可能归因于老化微塑料可以提高Cd在小麦体内的生物富集量.
Microplastic is a new type of pollutant that has received wide attention.This study explored the combined toxicity of polyvinyl chloride(PVC)microplastics and cadmium(Cd)to wheat before and after natural aging treatment.The surface of PVC microplastic after natural photoaging under C—Cl bond breakage accompanied by the generation of C=O,and the appearance of C=O improves the hydrophilicity of the surface of PVC microplastic,which subsequently enhances the adsorption capacity of Cd.According to the difference in leaf and root biomass during wheat growth and development,the joint toxicity of PVC microplastic and Cd was evaluated:virgin and aged PVC microplastic exhibit negligible effects on the toxicity of Cd to wheat leaves,while aged PVC microplastic exhibit great potential to increase the inhibitory effect on the growth of wheat roots for low concentrations of Cd.The synergistic effect of altered PVC microplastic and Cd may be attributed to the fact that aged microplastics can increase the bioaccumulation of Cd in wheat.
作者
顾馨悦
徐修媛
咸泽禹
张语珊
王超
谷成
GU Xinyue;XU Xiuyuan;XIAN Zeyu;ZHANG Yushan;WANG Chao;GU Cheng(School of the Environment,Nanjing University,Nanjing,210023,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第9期2633-2639,共7页
Environmental Chemistry
基金
国家自然科学基金(21906079)资助。
关键词
聚氯乙烯
老化微塑料
重金属
小麦
联合毒性
polyvinyl chloride
aged microplastics
heavy metals
wheat
joint toxicity
