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| Effects of polyaspartic acid on cadmium availability and adsorption-desorption behavior in Cd-gradient soils |
| Received:July 04, 2025 |
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| KeyWord:polyaspartic acid（PASP）;cadmium bioavailability;adsorption and desorption;soil remediation |
| Author Name | Affiliation | E-mail | | LI Yanmei | College of Land Resources and Environment, Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China, Jiangxi Agricultural University, Nanchang 330045, China
Jiangxi Huagan Environmental Technology R&D Co., Ltd., Nanchang 330096, China | | | WANG Wei | College of Land Resources and Environment, Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China, Jiangxi Agricultural University, Nanchang 330045, China | | | LIN Xiaobing | National Red Soil Improvement Engineering Technology Research Center, Jiangxi Institute of Red Soil and Germplasm Resources, Nanchang 331717, China | | | LIU Changzheng | College of Land Resources and Environment, Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China, Jiangxi Agricultural University, Nanchang 330045, China | | | LIU Shiyu | College of Land Resources and Environment, Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China, Jiangxi Agricultural University, Nanchang 330045, China | 397013250@qq.com | | XU Zhentang | Jiangxi Huagan Environmental Technology R&D Co., Ltd., Nanchang 330096, China | | | ZHANG Qin | College of Land Resources and Environment, Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China, Jiangxi Agricultural University, Nanchang 330045, China | | | HU Benliu | Jiangxi Huagan Environmental Technology R&D Co., Ltd., Nanchang 330096, China | |
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| Abstract: |
| To investigate the regulatory mechanism of polyaspartic acid（PASP）on cadmium bioavailability in contaminated soils, and to determine its optimal operational conditions and the response patterns under varying cadmium concentration gradients. In this study, two typical Cd-contaminated agricultural soils were investigated using BCR sequential extraction, batch adsorption -desorption experiments, and kinetic modeling to assess the effects of PASP（molecular weight：4 000 - 5 000 Da）on Cd speciation and adsorption - desorption behavior. The results demonstrated that the addition of PASP at 10 mg·kg-1 significantly increased the content of bioavailable Cd（P<0.05） by facilitating the transformation of less active Cd fractions into the acid-soluble form, without inducing significant changes in soil pH. Freundlich isotherm analysis revealed that PASP reduced the Cd adsorption capacity of the soil, increased the desorption rate, and lowered the hysteresis index, collectively indicating that PASP inhibits Cd adsorption and promotes its desorption. According to the Elovich model, Cd adsorption proceeded through three distinct phases：rapid（0 - 1 h）, slow（1 - 10 h）, and equilibrium（>10 h）. The most effective Cd activation occurred at pH 6 and temperatures between 15-25 ℃, with background Cd levels exerting minimal influence. This study offers theoretical insights essential for advancing PASP-enhanced phytoremediation strategies for Cd-contaminated soils. |
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