| 许华强,王林,孙约兵,戴子纯,邓凯,王童玉,梁学峰.不同钝化剂对土壤镉有效性与生物可给性的对比影响研究[J].农业环境科学学报,2025,44(4):919-929. |
| 不同钝化剂对土壤镉有效性与生物可给性的对比影响研究 |
| Comparison of effects of different amendments on availability and bioaccessibility of cadmium in soils |
| 投稿时间：2024-03-22 |
| DOI：10.11654/jaes.2024-0250 |
| 中文关键词: 钝化修复 镉 有效性 生物可给性 化学形态 |
| 英文关键词: immobilization remediation cadmium availability bioaccessibility chemical speciation |
| 基金项目:国家自然科学基金项目（41571322）；中国农业科学院科技创新工程项目（CAAS-CSGLCA-2020302） |
| 作者 | 单位 | E-mail | | 许华强 | 农业农村部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室, 农业农村部环境保护科研监测所, 天津 300191 | | | 王林 | 农业农村部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室, 农业农村部环境保护科研监测所, 天津 300191 | wanglin2017@caas.cn | | 孙约兵 | 农业农村部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室, 农业农村部环境保护科研监测所, 天津 300191 | | | 戴子纯 | 农业农村部环境保护科研监测所公共实验室, 天津 300191 | | | 邓凯 | 农业农村部环境保护科研监测所公共实验室, 天津 300191 | | | 王童玉 | 农业农村部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室, 农业农村部环境保护科研监测所, 天津 300191 | | | 梁学峰 | 农业农村部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室, 农业农村部环境保护科研监测所, 天津 300191 | |
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| 中文摘要: |
| 为探究不同钝化剂对土壤镉（Cd）有效性和生物可给性的影响，本文开展土培实验，研究施用巯基坡缕石（MP）、羟基磷灰石（HAP）、铁改性生物炭（FeBC）对酸性（湘潭）和弱碱性（济源）土壤 Cd有效性、化学形态及生物可给性的影响，并通过体外消化与连续提取的联合实验及冗余分析揭示其作用机制。结果表明：添加MP和HAP显著降低供试土壤的Cd有效性，最大降低率分别为82.27%和47.88%；FeBC显著提高Cd有效性。施用MP显著降低济源和湘潭土壤肠阶段的Cd生物可给性，最大降幅分别为97.97%和 51.11%；施用 HAP显著降低湘潭土壤肠阶段的 Cd生物可给性，最大降幅为 54.13%；施用高剂量 FeBC则显著提高两种土壤胃阶段的Cd生物可给性。施用MP和HAP促进土壤Cd由可交换态向铁锰氧化物结合态转化；施用FeBC则促进土壤碳酸盐结合态和铁锰氧化物结合态Cd转化为可交换态Cd。联合实验和冗余分析的结果表明，生物可给态Cd主要来源于可交换态Cd，3种钝化剂主要通过调控可交换态 Cd的溶出来影响 Cd的生物可给性。研究表明，3种钝化剂中 MP的钝化效果最佳，在降低土壤Cd污染带来的健康风险方面具有较好的应用价值。 |
| 英文摘要: |
| A soil incubation experiment was conducted in this study to investigate the effects and mechanisms of three different passivating agents on the availability, chemical forms, and bioaccessibility of cadmium（Cd）in two distinct soils. Mercapto-palygorskite（MP）, hydroxyapatite（HAP）, and iron-modified biochar（FeBC）were used as passivating agents. Paddy soil（acid）collected from Xiangtan and fluvo-aquic soil（weakly alkaline）from Jiyuan were utilized as test soils. A combined experiment of in vitro digestion and sequential extraction as well as redundancy analysis（RDA）were employed to reveal the functional mechanisms of these agents on the bioaccessibility of Cd. The findings showed that MP and HAP treatments significantly reduced the available Cd concentrations in two soils, with maximal reduction rates of 82.27% and 47.88%, respectively, whereas the addition of FeBC significantly increased Cd availability. MP treatments significantly reduced the Cd bioaccessibility in the intestinal phase in Jiyuan and Xiangtan soils, with maximal reductions of 97.97% and 51.11%, respectively. HAP addition significantly decreased Cd bioaccessibility in the intestinal phase in Xiangtan soil, with a maximal reduction of 54.13%. Conversely, the addition of high-dose FeBC significantly increased Cd bioaccessibility in the gastric phase in both soils. Application of MP and HAP promoted the conversion of exchangeable Cd to Fe/Mn oxide-bound Cd in both soils, while FeBC treatments advanced the conversion of carbonate-bound Cd and Fe/Mn oxide-bound Cd to exchangeable Cd in two soils. The results of the combined experiment and RDA indicated that exchangeable Cd was the primary source of bioaccessible Cd in both soils, and the three amendments influenced Cd bioaccessibility mainly by affecting the dissolution of exchangeable Cd. MP is the most effective among the three amendments, and has promising application potential in reducing the health risks associated with soil Cd pollution. |
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