Study on the remediation effect of five passirator application levels on cadmium contaminated soil in paddy fields

doi:10.14088/j.cnki.issn0439-8114.2022.16.005

Abstract

Abstract: Screening of soil passivators with high efficiency and low cost is of great significance in remediation of heavy metal polluted farmland soils. The effects of five typical passivators, i.e., lime-zeolite mortars, palygorskite, passivator of silicon-calcium, passivator of silicon-calcium-aluminium and passivator of silicon-calcium-magnesium at difference additions, on cadmium content in paddy soil and rice grain were investigated in this field experiment. The results showed that soil pH was increased by several passivators, of which the lime-zeolite treatment had the greatest effect on soil pH. The paddy soil with passivator of silicon-calcium had the lowest available cadmium content, and the maximum reduction rate was 15.9%. The Cd content in brown rice was significantly reduced by passivator of silicon-calcium, attapulgite and lime-zeolite at the dosage of 4 500 kg/hm², reaching the National Standard GB 2762—2017, and the rice was qualified for eating. Considering the beneficial effect of passivator of silicon-calcium on soil physical and chemical properties and crop growth, passivator of silicon-calcium could be used as an efficient precaution for safe utilization of cadmium contaminated paddy fields.

Key words: passivator, cadmium contamination, paddy field, effect of immobilization remediation

CLC Number:

ZHANG Qing-ya, LU Qi, LI Fan, LEI Wen-jie, HONG Xin, LI Kang-jun. Study on the remediation effect of five passirator application levels on cadmium contaminated soil in paddy fields[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(16): 30-34.

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