Reduction of Soil Cadmium Bioavailability by Using Industrial Byproduct Phosphorus Slag

更新时间:2023-05-28

【摘要】In this study, an alternative and cost-effective industrial byproduct phosphorus slag（PS） was utilized to treat simulated Cd-contaminated soil. The modified European Community Bureau of Reference（BCR） sequential extraction procedure was applied to assess the ability of PS to reduce Cd mobility in contaminated soil by the incubation experiments. The results showed 2%（W/W） PS reduced the exchangeable fraction of Cd by 99.7%, which also increased the pH, electrical conductivity, cation exchange capacity, available phosphorus, and available silicon of the soil. The results suggested that the PS could decrease Cd bioavailability and improve soil nutrition. This was demonstrated by the pot experiments. The Cd accumulation in both pakchoi（Brassica chinensis L.） leaf and root was reduced along with the reduction of the Cd translocation factor（TF） and the bioaccumulation factors（BCF） in pakchoi. In Cd-contaminated soil(3.16 mg·kg–1), the 2%（W/W） PS reduced the Cd content in the leaf and root of pakchoi by 70.7% and 58.7%, respectively. Meanwhile, the increase of the chlorophyll content in pakchoi and the promotion of pakchoi root system development suggested healthy plant growth in the PS treated soil.

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