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Microplastics can affect soil properties and chemical speciation of metals in yellow-brown soil

Ecotoxicology and Environmental Safety 2022 79 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Lingshi Yin Yuannan Long, Xiaofeng Wen, Lingshi Yin Lingshi Yin Xiaofeng Wen, Lingshi Yin Changbo Jiang, You Zhang, Changbo Jiang, Changbo Jiang, Yuannan Long, Changbo Jiang, Lingshi Yin Xiaofeng Wen, Yuannan Long, Lingshi Yin Lingshi Yin Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Changbo Jiang, Zhenyu Zhou, Zhenyu Zhou, Yuannan Long, Xiaofeng Wen, Xiaofeng Wen, Lingshi Yin You Zhang, Xiaofeng Wen, Lingshi Yin Xiaofeng Wen, Xiaofeng Wen, Lingshi Yin Xiaofeng Wen, Xiaofeng Wen, Changbo Jiang, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Lingshi Yin Lingshi Yin You Zhang, Zhenyu Zhou, Zhenyu Zhou, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Zhenyu Zhou, Xiaofeng Wen, Ziyi Kang, Yuannan Long, Ziyi Kang, Yuannan Long, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, You Zhang, Xiaofeng Wen, Zhenyu Zhou, Lingshi Yin Lingshi Yin Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Qiaoling Sun, Xiaofeng Wen, Xiaofeng Wen, You Zhang, Lingshi Yin Lingshi Yin Xiaofeng Wen, Yuannan Long, You Zhang, Xiaofeng Wen, Zhenyu Zhou, Lingshi Yin Lingshi Yin Lingshi Yin Xiaofeng Wen, Yuannan Long, Yuannan Long, Xiaofeng Wen, Xiaofeng Wen, Xiaofeng Wen, Zhenyu Zhou, Xiaofeng Wen, Xiaofeng Wen, Xiaobao Nie, Yuannan Long, Xiaofeng Wen, Xiaofeng Wen, Zhiyuan Wu, Lingshi Yin You Zhang, Changbo Jiang, Changbo Jiang, Zhenyu Zhou, Lingshi Yin Zhenyu Zhou, Lingshi Yin Lingshi Yin Lingshi Yin Xiaofeng Wen, Yuannan Long, Lingshi Yin Xiaofeng Wen, You Zhang, Xiaofeng Wen, Lingshi Yin Xiaofeng Wen, Lingshi Yin Lingshi Yin

Summary

Researchers added five polymer types (LLDPE, PA, PU, PS, LDPE) at various concentrations to yellow-brown soil and measured their effects on soil physicochemical properties and the speciation of cadmium, copper, lead, and zinc. MPs shifted heavy metal distribution toward more bioavailable fractions, suggesting that microplastic contamination can increase the extractability and potential toxicity of co-occurring metals in soil.

Polymers

LDPE PA PE PS PU

Although the influence of microplastics (MPs) in different soil environments has been investigated, their effects on the physiochemical properties and chemical speciation of heavy metals in yellow-brown soil remains unknown. This study aimed to determine the effects of various concentrations of linear low-density polyethylene (LLDPE), polyamide (PA), polyurethane (PU), polystyrene (PS), and low-density polyethylene (LDPE) MPs on the yellow-brown soil environment and chemical speciation of the heavy metals cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn). MPs influenced the physicochemical properties and chemical speciation of heavy metals in yellow-brown soil. The physicochemical properties of yellow-brown soil can be altered by changing the concentrations of LDPE MP. The relationship between changes in field capacity (FC) and LDPE concentrations was approximately linear. The physiochemical properties of yellow-brown soil containing added PA, PU, and LDPE MPs were substantially improved (control vs. MPs): FC, 39 % vs. 42.50 % for PU, cation exchange capacity (CEC) 45.77, 56.65, and 57.44 cmol.kg for PA, PU, and LDPE respectively, and organic matter (OM) content, 40.16 vs. 51.68 g.kg for PA. The LLDPE and PU MPs also simultaneously affected the chemical speciation of heavy metals in yellow-brown soil. The LLDPE MPs increased the acid-soluble (45.17-54.67 % (Cd-F1), 7.24-11.30 % (Cu-F1), 4.20-7.23 % (Pb-F1), 21.21-31.47 % (Zn-F1)) and reducible (24.02-29.41 % (Cd-F2), 25.69-34.95 % (Cu-F2), 74.29-81.07 % (Pb-F2), 28.77-34.19 % (Zn-F2)) fractions of heavy metals, which increased their bioavailability. However, PU MPs reduced the ecological risk of heavy metals in yellow-brown soil by increasing the content of the residual fraction (26.11-40.21 % (Cd-F4), 47.63-59.67 % (Cu-F4), 17.25-26.76 % (Pb-F4), 32.63-50.46 % (Zn-F4)). Changes in the properties of yellow-brown soil and the impact of MPs on heavy metals, might change the chemical speciation of heavy metals. The impact of MPs on heavy metals in yellow-brown soil requires further investigation.

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