[微塑料在蔬菜土壤中共存对镉生物有效性的影响]。

Q2 Environmental Science
Zhi-Wang Feng, Qi Liu, Han-Zhou Wu, Ji-Zhou Li, Ning-Yuan Zhu, Yi-Min Wang
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引用次数: 0

摘要

土壤中重金属-微塑料的多重污染屡见不鲜,但这方面的生态风险研究还比较缺乏。在为期60天的盆栽试验中,采用不同生物可降解微塑料(MPs)和重金属镉(Cd)污染生菜土壤。分析了土壤的基本理化性质、Cd有效性以及Cd在生菜中的积累和转移效应。此外,利用三维荧光光谱分析了土壤溶解有机质(DOM)的组成特征。结果表明,MPs降低了土壤阳离子交换容量(CEC)和铵态氮(NH4+-N)含量,增加了土壤溶解有机碳含量。MPs和Cd的多重污染显著增强了土壤DOM的微生物源特征,降低了DOM的腐殖化程度,显著削弱了DOM的原生特性。Cd- cacl2含量与土壤总Cd含量呈显著正相关,与土壤化学性质相关性不显著。MPs增加了生菜根系Cd积累,对叶片Cd积累无显著影响(P>0.05)。莴苣根、叶中Cd的积累主要受土壤中总Cd含量和Cd- cacl2含量(R>0.85, P<0.05)的影响,并随着土壤DOM腐殖质化程度和腐殖质样物质含量的增加而减少。本研究可为土壤微塑料与重金属复合污染的生态风险评价提供数据支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Effects of Microplastics Coexisting in Vegetable Soil on the Change of Cadmium Bioavailability].

The multiple contamination of heavy metal-microplastics occurs frequently in soil; however, ecological risk research on this subject is still lacking. In a 60-day pot experiment, lettuce in soils was contaminated with different biodegradable microplastics (MPs) and heavy metal cadmium (Cd). The basic physicochemical properties of the soil, Cd availability, and the accumulation and transfer effects of Cd in lettuce were analyzed. Additionally, three-dimensional fluorescence spectroscopy was used to analyze the composition characteristics of soil dissolved organic matter (DOM). The results indicated that MPs reduced the soil cation exchange capacity (CEC) and the content of ammonium nitrogen (NH4+-N) while increasing the content of soil dissolved organic carbon. The multiple contamination of MPs and Cd significantly enhanced the microbial source characteristics of soil DOM, reduced the humification degree of DOM, and significantly weakened its autochthonous characteristics. There was a significant positive correlation between the Cd-CaCl2 content and the total Cd content in the soil, while the correlation with soil chemical properties was not significant. MPs increased the accumulation of Cd in lettuce roots, with no significant effect on the accumulation of Cd in the leaves (P>0.05). The accumulation of Cd in lettuce roots and leaves was mainly influenced by the total Cd content in the soil and the Cd-CaCl2 content (R>0.85, P<0.05) and decreased with the increase in the humification degree of soil DOM and the content of humic-like substances. This study can provide data support for the ecological risk assessment of composite pollution of soil microplastics and heavy metals.

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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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