Effects of Low Molecular Organic Acids on the Removing of Pb,Cd in Calcareous Soils

doi:10.14088/j.cnki.issn0439-8114.2018.06.010

Abstract

Abstract: The effects of citric acid, malic acid and tartaric acid on leaching of Pb,Cd in contaminated soil were researched by oscillating methods. The results showed that compared with the control,desorption amount of Cd significantly increased with the addition of citric acid,malic acid and tartaric acid（P<0.05）. Malic acid and tartaric acid inhibited the desorption of Pb in different degree. Citric acid in low concentration inhibited but promoted in high concentration（>10.0 mmol/L） the desorption of Pb. The desorption rate curve indicated that the effect of the same or different organic acid on different heavy metal or the same heavy metal（promotion and inhibition） varied obviously. The desorption distribution coefficient of Pb（K_d） presented bell-shaped distribution,but the K_d of Cd decreased with organic acid increasing.

Key words: low molecular organic acids, leaching desorption, calcareous soil, Cd, Pb

CLC Number:

LIU Gui-hua, REN Jing, HU Gang, QIN Song, FAN Cheng-wu. Effects of Low Molecular Organic Acids on the Removing of Pb,Cd in Calcareous Soils[J]. HUBEI AGRICULTURAL SCIENCES, 2018, 57(6): 43-46.

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