微塑料对土壤磷吸附的影响
Effect of microplastics on soil phosphorus adsorption
唐子超 1唐晋 1梁伦套 1黎彦均 1蒋艳雪 1方芳 1郭劲松1
作者信息
- 1. 重庆大学 环境与生态学院,重庆 400045
- 折叠
摘要
微塑料是一类土壤中广泛存在的新兴污染物,其对土壤磷吸附的影响尚不明确.文中分析了0.1%～10%含量微塑料对土壤磷吸附特性的影响及机制.结果表明,微塑料会使得吸附第一阶段液膜扩散阶段速率显著提升(p<0.05).与纯土壤(qe=6.456 mg/g)相比,含量1%以下的微塑料显著降低了土壤磷吸附容量(p<0.05),但5%以上的微塑料显著提升了土壤磷吸附容量(p<0.05).同等含量下,微塑料粒径越小,微塑料-土壤体系的磷吸附量越大.微塑料可与磷竞争吸附位点,降低了微塑料-土壤体系对磷的吸附,但微塑料也可直接吸附磷,故当微塑料为 5%及以上时,微塑料-土壤体系对磷的吸附量升高.因此,土壤微塑料污染可显著改变土壤对磷的吸附特性,且与微塑料的含量和粒径等因素密切相关.
Abstract
Microplastics are emerging pollutants widely present in soil,and their effects on soil phosphorus(P)adsorption are still unclear.This paper examined the effects of 0.1%to 10%microplastics on soil P adsorption and the underlying mechanisms.The results showed that microplastics could significantly increase the rate of liquid film diffusion stage in the first stage of the adsorption process(p<0.05).Compared with the pure soil(qe= 6.456 mg/g),the soil P adsorption capacity was significantly reduced by microplastics with less than 1%concentration(p<0.05).However,the soil P adsorption capacity was significantly increased by microplastic with concentrations higher than 5%(p<0.05).Additionally,the smaller the particle size of microplastics,the greater the P adsorption capacity of soil with the same microplastic concentration.Microplastics could compete with P for adsorption sites,which reduced the adsorption of P in the microplastic-soil system.However,microplastics could also directly adsorb P,leading to an increase in the P adsorption capacity of microplastic-soil system when microplastic concentration were more than 5%.Therefore,microplastics pollution in soil could significantly change P adsorption characteristics,which closely related to the microplastics concentration and particle size.
关键词
微塑料/土壤/磷/吸附Key words
microplastics/soil/phosphorus/adsorption引用本文复制引用
基金项目
国家自然科学基金(32001195)
国家重点研发计划(2019YFD1100501)
出版年
2024
国家科技期刊平台
NSTL
万方数据