Influence of Exogenous Humic Acid on Heavy Metal Cd Activity in Clayey Farmland Soil

ZHANG Di-meng; HU Yan-ping; WANG Zhen-hua; LI Qing-yun; LI Guan-ya

doi:10.11988/ckyyb.20181110

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Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (2) : 68-71. DOI: 10.11988/ckyyb.20181110

AGRICULTURAL WATER CONSERVANCY

Influence of Exogenous Humic Acid on Heavy Metal Cd Activity in Clayey Farmland Soil

ZHANG Di-meng, HU Yan-ping, WANG Zhen-hua, LI Qing-yun, LI Guan-ya

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Abstract

The effects of two different extrogenous humic acids on the activity of Cd in clayey farmland were examined by measuring the content of total Cd, DTPA-Cd and MgCl₂-Cd after leaching treatment. After two humic acid treatments, the total content of Cd content in the soil remained unchanged in general, the content of DTPA-Cd decreased from 0.421 mg/kg to 0.313 mg/kg, and the content of MgCl₂-Cd declined from 0.2 mg/kg to 0.169 mg/kg. When leaching time increased from 1 day to 5 days, the total content of Cd also remained unchanged overall, DTPA-Cd decreased from 0.325 mg/kg to 0.265 mg/kg, and MgCl₂-Cd reduced from 0.196 mg/kg to 0.165 mg/kg. In conclusion, both the exogenous humic acids could remove Cd in the soil of clayey farmland.

Key words

farmland soil / humic acid / soil leaching / total Cd / DTPA-Cd / MgCl₂-Cd

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ZHANG Di-meng, HU Yan-ping, WANG Zhen-hua, LI Qing-yun, LI Guan-ya. Influence of Exogenous Humic Acid on Heavy Metal Cd Activity in Clayey Farmland Soil[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(2): 68-71 https://doi.org/10.11988/ckyyb.20181110

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