Remediation effect of different passivation agents on cadmium in phosphogypsum contaminated soil

doi:10.14088/j.cnki.issn0439-8114.2020.12.014

Abstract

Abstract: In order to understand the remediation effect of passivation agents on the phosphogypsum contaminated soil, a pot experiment was carried out to investigate the effect of different combinations of passivation agents [iron scraps（I,I1 and I5 represents 1% and 5% respectively）, flyash（F,F1 and F5 represents 1% and 5% respectively） and superphosphate（S,S1 and S5 represents 1% and 5% respectively）]on remediation of cadmium in phosphogypsum contaminated soil, and on the growth as well as the cadmium accumulation of maize seedlings. The results showed that except for I5+F1+S1 and I5+F5 treatments, which could inhibit the plant height and dry weight of up-ground parts of maize seedlings, other treatments had no significant effect on the growth of maize seedlings. All treatments tested could increase the electrical conductivity of phosphogypsum contaminated soil, besides, I1+F5, I5+F1+S1 and I5+F5 treatments could also dramatically increase the soil pH. All treatments could decrease the available cadmium concentrations in soil. I5+S5, I5+F1+S1 and I5+F5 treatments had the biggest drop compared with CK, which were 39.13%、45.65% and 41.30%, respectively. All treatments could decrease the cadmium concentration of up-ground parts of maize seedlings. Compared with CK, the cadmium concentration of up-ground parts of I5+S5, I5+F1+S1 and I5+F5 treated maize seedlings decreased by 29.47%, 21.95% and 31.71%, respectively. All treatments could effectively reduce the activity of cadmium in phosphogypsum contaminated soil. In addition, I5+S5 treatment could significantly decrease the cadmium accumulation of maize seedlings without effecting their growth.

Key words: phospogypsum, maize seedling, immobilization remediation, cadmium

CLC Number:

WANG Xian-hui, LONG Tao, ZHANG Jian-kun, ZHOU Chun-zhuang, TANG Yun-lai, LIU Ji-kai. Remediation effect of different passivation agents on cadmium in phosphogypsum contaminated soil[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(12): 68-71.

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