Heavy metal distribution in particle size fractions of floodplain soils from Dongchuan, Yunnan Province, Southwest China
Heavy metal distribution in particle size fractions of floodplain soils from Dongchuan, Yunnan Province, Southwest China
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DOI：
10.1007/s10661-020-08836-8
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发表时间：
2021-01
影响因子：
3
通讯作者：
Qian Zhang;Fangfang Zhang;Chengmin Huang
中科院分区：
文献类型：
--
作者：
Qian Zhang;Fangfang Zhang;Chengmin Huang
土壤中重金属的污染程度受土壤粒径分布的影响很大。然而，粒度提取过程中重金属的损失以及方解石在粒度方面对重金属去除的影响尚不清楚。本文研究了采自云南东川河漫滩的两个土壤样品和一个沉积物样品中Cu、Cd、Cr、Co、Ni、Zn、Pb、U和V在5个粒径（> 2、2-0.25、0.25-0.02、0.02-0.002和< 0.002 mm）中的分布。河漫滩土壤主要由砾石和砂组成（> 97%）。所有9种重金属在采样土壤和沉积物中的浓度随粒径的减小而显著增加。土壤中Cd和Cu的最大损失率分别为54%和8.6%，在土壤颗粒级提取过程中应予以考虑。纯方解石对溶液中重金属的去除量和去除率均为Pb 2 +> Cu 2 +> Cr 6+，其中Pb的去除率（93.13%）远高于Cu（24.56%）和Cr（10.71%），且随着方解石粒径的减小，Pb和Cr的去除率也随之增大。土壤中碳酸盐矿物的稳定化是东川高碳酸盐含量洪泛区土壤重金属污染控制的关键。
The heavy metal pollution level in soils is heavily affected by the soil particle size distribution. However, the heavy metal loss during particle size extraction and the effect of calcite on the heavy metals removal in terms of the particle size are unclear. In this study, the distribution of heavy metals (Cu, Cd, Cr, Co, Ni, Zn, Pb, U, and V) was determined in five particle fractions (> 2, 2–0.25, 0.25–0.02, 0.02–0.002, and < 0.002 mm) of two soil and one sediment samples collected from the floodplain of Dongchuan, Yunnan Province, Southwest China. The sampled floodplain soils were mainly composed of gravel and sand fractions (> 97%). The concentrations of all nine heavy metals in the sampled soils and sediment increase significantly with decreasing particle sizes. The maximal loss rate of Cd and Cu reaches 54% and 8.6%, respectively, which should be considered in the process of particle size fraction extraction in soils. The removal amount and removal rate of heavy metals in solution by pure calcite ranks in the order of Pb2+> Cu2+> Cr6+, while the removal rate of Pb (93.13%) is much higher than that of Cu (24.56%) and Cr (10.71%), which increase with the calcite particle size decreasing. The stabilization of carbonate minerals in soils is crucial for heavy metal pollution control in floodplain soils with high carbonate concentrations in Dongchuan, China.