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Study on passivation effect of different passivators on Cd contaminated soil in Enshi
Vol 4, Issue 1, 2023
VIEWS - 107 (Abstract)
Abstract
In order to solve the problem of cadmium (CD) pollution in Enshi mountain vegetable soil, pot experiment was used to study the effects of different passivators (biochar, hydroxyapatite, lime powder, fly ash and mixed organic passivators) on the passivation effect of Cd in the test soil and the yield, quality and Cd content of Chinese cabbage. The results showed that except the lime powder treatment inhibited the growth of Chinese cabbage, other treatments promoted the fresh weight and plant height of Chinese cabbage, and the fly ash treatment increased the fresh weight of Chinese Cabbage by 109.72% Hydroxyapatite, lime powder and mixed passivator increased soil ph by 25.18%, 36.61% and 28.21% respectively. Each treatment had no significant effect on the activities of soil urease, cellulase and sugarcane enzyme; Biochar and mixed passivator treatment significantly increased phosphatase activity by 52.85% and 69.82%, while lime powder treatment significantly inhibited phosphatase activity. The five passivator treatments all reduced the content of heavy metal Cd in Chinese cabbage. Among them, biochar, hydroxyapatite, lime powder and mixed passivator all achieved significant absorption inhibition effect, and lime powder was the best, reducing 73.80%. Each treatment had no significant effect on the quality of Chinese cabbage. Biochar and mixed passivator treatment reduced the total Cd content in soil by 27.21% and 46.98% respectively; The treatment of lime powder and mixed passivator reduced the ion-exchange CD43 in soil 67%, 47.35%. The application of five passivators can reduce the CD content of Chinese cabbage. The mixed passivator treatment not only does not affect the yield and quality of Chinese cabbage, but also enhances the soil enzyme activity and reduces the proportion of total Cd and effective CD (ionic and water-soluble) in the soil.
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Prof. Jesus Simal Gandara
Food Science, the University of Vigo, Spain
