| 张璠,赵玉杰,马秀兰,周其文,刘潇威,张铁亮,郭新蕾,王祖光,宋志廷,王继军.基于DGT技术分析土壤重金属Cd、Ni的老化特征[J].农业环境科学学报,2019,38(11):2487-2495. |
| 基于DGT技术分析土壤重金属Cd、Ni的老化特征 |
| Aging characteristics of Cd and Ni in soil based on DGT technology |
| 投稿时间：2019-02-25 |
| DOI：10.11654/jaes.2019-0196 |
| 中文关键词: 老化 DGT 镉 镍 土壤 |
| 英文关键词: aging DGT cadmium nickel soil |
| 基金项目:公益性行业（农业）科研专项项目（201403014-01）；国家科技支撑项目（2015BAD06B03-1）；国家重点研发计划项目（2016YFD0800301-01） |
| 作者 | 单位 | E-mail | | 张璠 | 吉林农业大学资源与环境学院, 长春 130118
农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | | | 赵玉杰 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | yujiezhao@126.com | | 马秀兰 | 吉林农业大学资源与环境学院, 长春 130118 | 491277643@qq.com | | 周其文 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | zhouqiwen@cae.org.cn | | 刘潇威 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | | | 张铁亮 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | | | 郭新蕾 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | | | 王祖光 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | | | 宋志廷 | 农业农村部环境保护科研监测所, 天津 300191
农业农村部农产品质量安全环境因子控制重点实验室, 天津 300191 | | | 王继军 | 农业农村部环境保护科研监测所, 天津 300191 | |
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| 全文下载次数: 1912 |
| 中文摘要: |
| 为明确重金属在土壤中的老化进程，锁定关键影响因子，采用梯度扩散薄膜（DGT）技术探究了外源添加Cd和Ni两种重金属在6种不同类型土壤中的老化特性，并探讨了影响重金属老化过程的关键因子。结果表明：Cd、Ni在不同土壤中的老化过程差异性明显，Ni比Cd更易老化。进入土壤中的重金属老化过程大致分为3个阶段，添加后20~30 d为快速老化阶段，30~60 d为缓慢老化期，除个别高污染土壤外，其余土壤均在60 d后基本达到平衡。数据分析结果表明，6种土壤中Cd、Ni的老化平衡浓度由初始浓度决定，初始浓度、CEC等因子为影响Cd、Ni老化速率的主控因素。DGT作为一种原位、非破坏性、不引入外源离子的监测技术，可以动态展示土壤外源添加重金属在老化过程中的活性变化，对评估土壤重金属污染风险具有重要参考价值。 |
| 英文摘要: |
| The bioavailability of heavy metals entering the soil gradually decrease with aging time, and their toxicities are weakened. This process is greatly affected by the physical and chemical properties of the soil and the types and concentrations of the heavy metal. To study the aging process of exogenous heavy metals in the soil and analyze the influences of soil properties on the aging process, it is critical to assess the pollution risk of heavy metals. In the present study, the diffusive gradients in thin-films(DGT) technique was employed to investigate the aging characteristics of Cd and Ni in six types of soils. The aging process was fitted by a three-parameter isotope dilution equation, and the main factors were clarified by the Lasso model and the DPS method. The results showed that the aging process of Cd and Ni in different soils had significant differences, and the bioavailability of Ni decreased faster than that of Cd. The aging process of Cd and Ni could be divided into three stages generally. The period of rapid aging lasted about 20 to 30 days; the period of slow aging lasted about 30 to 60 days; and the final stage, the balance period lasted about 60 days, these features were true in all soil types except in some highly polluted soil. The equilibrium concentrations of Cd and Ni in the six soils were determined based on the initial total concentrations before the aging process. Another factor affecting the aging rate of Cd and Ni was the cation exchangeable capacities(CEC). DGT, as a non-destructive insitu technique, could represent dynamic changes in the bioavailable heavy metals during the aging process of exogenous heavy metal entering the soil. |
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