| 基于铅稳定同位素的多金属复合污染土壤源解析新思路——以西南地区某矿区农田为例 |
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| 引用本文： | 王刘炜,程敏,邓渠成,侯仁杰,侯德义.基于铅稳定同位素的多金属复合污染土壤源解析新思路——以西南地区某矿区农田为例[J].土壤,2022,54(5):1032-1040. |
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| 作者姓名： | 王刘炜 程敏 邓渠成 侯仁杰 侯德义 |
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| 作者单位： | 清华大学环境学院,清华大学环境学院,广西民族大学政治与公共管理学院,清华大学环境学院；东北农业大学水利与土木工程学院,清华大学环境学院 |
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| 基金项目： | 国家自然科学基金项目（42077118）和国家重点研发计划项目（2020YFC1808000）共同资助。 |
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| 摘 要： | 我国土壤环境质量状况不容乐观，多金属复合污染问题突出。识别土壤多金属污染成因，是土壤污染源头预防与长效治理修复的关键。铅稳定同位素是一种强有力的源解析手段，基于不同环境样品之间存在的特异性铅同位素比值，能够定量解析潜在污染源对于土壤重金属积累的贡献率。然而不同来源环境样品之间常存在同位素信号交叠的问题，这种情形严重影响同位素源解析技术的应用。本文以我国西南某矿区典型多金属复合污染农田土壤为例，基于铅稳定同位素分析，结合矿物学分析，对土壤铅来源进行定量解析，并针对其它重金属来源进行外推。同位素源解析结果表明，人为源对于土壤重金属的贡献率高达61% ~ 89%，矿渣浸沥与矿区道路扬尘为主要的污染途径。矿物学分析能够辅助印证铅稳定同位素分析结果，在一定程度上克服由于污染源信号重叠造成的源解析困难。通过相关分析，可以将铅同位素源解析的结果合理外推，在一定程度上解释其它重金属元素的来源。本文提出的源解析新思路能够高效、准确地解析多金属复合污染土壤中重金属元素的来源，尤其适用于我国土壤多金属复合污染集中连片存在、成因复杂的现状，具有很强的现实意义。
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| 关 键 词： | 土壤污染 源解析 同位素 矿物学分析 重金属 |
| 收稿时间： | 2022/1/28 0:00:00 |
| 修稿时间： | 2022/3/24 0:00:00 |
Fresh Insights into Source Identification of Multi-elements in Soil with Stable Pb Isotope: A Case Study of Mining-affected Agricultural Land |
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| WANG Liuwei,CHENG Min,DENG Qucheng,HOU Renjie,HOU Deyi.Fresh Insights into Source Identification of Multi-elements in Soil with Stable Pb Isotope: A Case Study of Mining-affected Agricultural Land[J].Soils,2022,54(5):1032-1040. |
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| Authors: | WANG Liuwei CHENG Min DENG Qucheng HOU Renjie HOU Deyi |
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| Institution: | School of Environment, Tsinghua University,School of Environment, Tsinghua University,School of Politics and Public Administration, Guangxi University for Nationalities,School of Environment, Tsinghua University; School of Water Conservancy and Civil Engineering, Northeast Agricultural University,School of Environment, Tsinghua University |
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| Abstract: | Soil contamination is a major environmental concern in China. Among various contaminants, heavy metals have attracted much attention due to their toxicity to human beings and the ecosystems. Source identification of soil metals is crucial for soil remediation. Stable lead (Pb) isotope analysis is a powerful tool for source identification, since the distinct isotope signatures among environmental samples act as fingerprints for quantitative calculation of source contributions. However, overlapping of Pb isotope compositions among various environmental samples often occur, making source identification difficult or even impossible. In this study an integrated approach for the source identification of multi-elements in soil is proposed. Stable Pb isotopes, with the help of mineralogical approaches, have successfully been applied for the source identification of a multi-metal contaminated agricultural soil in a typical mining district in Southwest China. Quantitative analysis of source contributions reveals that anthropogenic sources account for 61% ~ 89% of soil metal accumulation. Stable isotope analysis indicates that mining waste leaching and mining dust raising from the road both contribute to soil contamination, but the signals of these two processes are overlapped, making it impossible to distinguish the contributions of each. Mineralogical analysis has therefore been used to aid in source identification. Considering that concentrations of other metals correlate well with Pb, it is suggested that the results from lead isotope analysis could be further extrapolated to reveal the sources of other soil metals. |
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| Keywords: | Soil contamination source apportionment stable isotope mineralogical analysis heavy metal |
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