Polylactic acid microplastics and polyhydroxyalkanoate microplastics affect cadmium mobility by regulating sediment geochemical properties

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Wang Li, Hanwen Huangdeng, Xiaofei Zhao, Bo Zu, Jiawen Li
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引用次数: 0

Abstract

Purpose

Microplastics may affect the bioavailability of heavy metals in sediments primarily through direct adsorption. However, the potential of microplastics to alter the distribution of heavy metal chemical forms by interfering with the geochemical properties of sediments which may indirectly affect the bioavailability of heavy metals, has been overlooked. This study investigated the impact of two widely used biodegradable microplastics, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), on the distribution of cadmium (Cd2+) in cadmium-contaminated sediments.

Methods

Varying concentrations and particle sizes of PLA and PHA were added to Cd-pre-contaminated sediment and incubated under simulated submersion conditions for 60 days. The distribution of Cd2+ fraction in the sediment was determined, and the influence of biodegradable microplastics on cadmium mobility, through the regulation of sediment geochemical properties, was assessed.

Results

Compared to the control group, the pH value and organic matter content of sediments treated with biodegradable microplastics significantly decreased, which in turn caused a transformation in the chemical form of cadmium. Higher concentrations and smaller particle sizes significantly promote a shift in cadmium components toward acid-soluble forms, thereby enhancing the mobility of cadmium in sediments, thereby amplifying its environmental toxicity.

Conclusion

These results emphasize the potential of biodegradable microplastics to indirectly affect the mobility of cadmium by regulating sediment geochemical properties.

Abstract Image

聚乳酸微塑料和聚羟基烷酸微塑料通过调节沉积物地球化学特性影响镉的迁移性
目的 微塑料可能主要通过直接吸附作用影响沉积物中重金属的生物利用率。然而,微塑料可能会通过干扰沉积物的地球化学特性来改变重金属化学形态的分布,从而间接影响重金属的生物利用率,这一点却被忽视了。本研究调查了两种广泛使用的可生物降解微塑料--聚乳酸(PLA)和聚羟基烷酸(PHA)--对镉污染沉积物中镉(Cd2+)分布的影响。结果与对照组相比,用可生物降解的微塑料处理过的沉积物的 pH 值和有机物含量明显降低,从而导致镉的化学形态发生变化。较高的浓度和较小的粒径可明显促进镉成分向酸溶性形式转变,从而增强镉在沉积物中的流动性,进而扩大其环境毒性。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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