Accumulation, bioavailability and potential ecological risk of seven heavy metals – chromium (Cr), nickel (Ni), copper (Cu), zinc (Zn), arsenic (As), cadmium (Cd) and lead (Pb) – have been analyzed in agricultural soil aggregates with particle size of > 1 mm, 0.25–1 mm, 0.05–0.25 mm, and < 0.05 mm from the Fenhe River Basin (FRB). Accumulation factor (AF) analysis demonstrated that heavy metals tend to be enriched in < 0.05 mm soil aggregate. The bioavailability to plants of Cu, Zn, and Cd was higher than that of other metals and increased with the decrease in soil aggregate particle sizes. Risk assessment code (RAC) of Ni, Cu, Zn and Cd were 13.84%–21.08%, 7.13%–13.74%, 32.08%–51.82% and 29.38%–43.82%, indicating that Cu, Zn, Cd and Ni had a low to very high risk to other ecosystems, and the smaller the particle size (0.05–0.25 mm and < 0.05 mm), the greater ecological risk.

中文翻译：

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en河流域土壤团聚体中重金属的分布与生物利用度

分析了七种重金属（铬（Cr），镍（Ni），铜（Cu），锌（Zn），砷（As），镉（Cd）和铅（Pb））的积累，生物利用度和潜在的生态风险。 from河流域（FRB）的粒径> 1 mm，0.25-1 mm，0.05-0.25 mm和<0.05 mm的农业土壤团聚体中。累积因子（AF）分析表明，<0.05 mm的土壤聚集体中富含重金属。Cu，Zn和Cd对植物的生物利用度高于其他金属，并且随着土壤团聚体颗粒尺寸的减小而增加。Ni，Cu，Zn和Cd的风险评估码（RAC）为13.84％–21.08％，7.13％–13.74％，32.08％–51.82％和29.38％–43.82％，表明Cu，Zn，Cd和Ni具有对其他生态系统具有低到非常高的风险，并且粒径较小（0.05-0。