DGT和CaCl<sub>2</sub>提取下冶炼场地及周边土壤Cd固液分配特征

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Abstract The available Cd content in soil around smelting sites is high and easy to migrate. Based on DGT and CaCl₂ extraction methods, the available Cd contents and their partition coefficients in various types of soil around a typical smelting site were analyzed, and a regression prediction model was constructed. The results showed that the available Cd content in the slag mixed soil, forest surface soil, and deep soil was higher, with extraction values of 23.2, 1.90, and 2.53μg/kg, respectively, while the deep farmland soil, miscellaneous fill soil, and plain fill soil were low, with values of 0.03, 0.05 and 0.03μg/kg, respectively. The solid-liquid partitioning coefficients (K_d) of Cd in soil were the highest in mixed fill, plain fill, and slag mixed soil, followed by clay and farmland soil, and lowest in fully weathered soil and forest soil. The K_d values of Cd determined by DGT were generally higher than that of CaCl₂ extraction. The soil-liquid ratio and the pH of the CaCl₂ extraction solution significantly affected the determination results of the K_d value (P<0.05). CaCl₂ results could accurately predict K_d values determined by DGT using linear regression (P<0.05).

Key words： diffusive gradients in thin-films (DGT) soil solid-liquid partitioning coefficients soil-liquid ratio regression prediction model heavy metals

Received: 16 February 2022

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X53

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	Articles by authors
	ZHOU Zi-ruo
	PENG Chi
	JIANG Zhi-chao
	LIU Xu
	GUO Zhao-hui
	XIAO Xi-yuan

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ZHOU Zi-ruo,PENG Chi,JIANG Zhi-chao等. Solid - liquid partitioning of Cd in soils around a smelting site based on DGT and CaCl₂ extraction[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4248-4254.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/4248

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