数字农科院2.0

Critical factors and cost estimation for the immobilization of cadmium-contaminated paddy fields for rice safety

文献类型： 外文期刊

作者： 李淑琪;;林大松;;霍莉莉;;吴波;;孙莉霞;;安毅;;夏雨晴

作者机构：

关键词： Cd · Soil · Immobilization · Impact factors · Remediation cost

期刊名称： JOURNAL OF SOILS AND SEDIMENTS

ISSN： 1439-0108

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Purpose This study aims to simplify the complex relationship between cadmium (Cd) content in rice and its influencing factors by analyzing key factors and remediation costs to ensure the safety of rice production on Cd-contaminated farmlands. Materials and methods In the research area, five 400 m² plots were established for passivation experiments, each with separate water inlets and outlets. Experimental units ranged from 5 to 18, with passivation material costs between 3,000 and 38,400 CNY/ha. Soil samples were collected using the plum blossom method, air-dried, and analyzed for pH, organic matter, nitrogen, phosphorus, potassium, and cadmium content. Mature rice samples were also collected to measure cadmium levels. Results and discussion At the 95% confidence level, the proportion of rice samples meeting the cadmium content standards ranged from 26.7% to 46.8%. The main influencing factors include soil available cadmium content (R = 0.15), soil pH (R = 0.231), and organic matter (R = 0.117). When rice Cd content ranges from 0.2 to 0.3 mg/kg, low-cost remediation (3,000–6,000 CNY/ha) can achieve a compliance probability exceeding 95%, while costs exceeding 6,000 CNY/ha indicate over-remediation. For rice Cd levels between 0.3 and 0.4 mg/kg, remediation costs of 6,000–9,000 CNY/ha are required to ensure a compliance rate ≥ 95%. The reduction efficiency of Cd content improves with increasing costs but shows no significant enhancement beyond 15,000 CNY/ha. Conclusions This study quantified the relationship between remediation costs and rice safety assurance. Results indicated that at a 95% confidence level, 26.7% to 46.8% of rice samples met Cd content standards post-treatment. Significant factors affecting compliance included soil acidity, pH, and organic matter, with remediation costs over 15,000 CNY/ha showing diminishing returns. It fitted the quantitative relationship between remediation cost and the reduction in Cd content in rice: y =-1.15 + 1.51 × (1-exp[-4 × 10−4x]), x represents cost of contaminated soil remediation (CNY/ha), and y represents Cd content reduction in rice (mg/kg).

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