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The use of bentonite and organic amendments for remediation of Cd contaminated fields: An environmental perspective
Author(s) -
Pei Penggang,
Xu Yingming,
Zheng Shunan,
Liang Xuefeng,
Sun Yuebing,
Lin Dasong,
Wang Lin
Publication year - 2020
Publication title -
land degradation and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.403
H-Index - 81
eISSN - 1099-145X
pISSN - 1085-3278
DOI - 10.1002/ldr.3797
Subject(s) - environmental remediation , soil quality , environmental science , soil contamination , soil water , soil conditioner , amendment , bentonite , contamination , soil organic matter , vermicompost , environmental chemistry , organic matter , soil fertility , agronomy , chemistry , nutrient , soil science , biology , ecology , paleontology , organic chemistry , political science , law
A successful technique for remediation of cadmium (Cd) contaminated soil could not only reduce its availability but also improve soil biological function. However, there are few studies that evaluate the efficiency of remediation of Cd‐contaminated soil within a sustainability framework. Therefore, a field study was conducted to investigate the remediation effectiveness and environmental impact of Cd‐contaminated vegetable soils using bentonite (B), bentonite + mushroom residue (BMR1, BMR2), and bentonite + vermicompost (BVC1, BVC2). Soil Cd bioavailability were inhibited after applying of B, BMR and BVC, and the most significant reduction of CaCl 2 ‐ and HCl‐Cd was obtained at BMR2, being 45.5 and 24.9% decreases, respectively, relative to the control groups. Meanwhile, the concentration of Cd in the edible parts of vegetables was reduced by amendments and lettuce and leafy lettuce met the maximum limit of contaminants in vegetables (0.2 mg kg −1 ) (GB2762‐2017). Combined treatments had greater effects on soil fertility parameters (e.g., higher values of available N, P and K, soil organic matter, and microbial biomass C and N) as well as microbial community composition which were characterized by significant increases in the Shannon and the Simpson indices, and the quantity and abundance of dominant genera. These findings offer evidence that combined amendments could be more efficiently used for the remediation of Cd‐contaminated soils, with the goal of low Cd availability in soil and uptake in the vegetables, and improving soil quality.