| 决策单元-多点增量采样(DUMIS)在镍污染地块基坑清挖效果评估中的应用 |
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| 引用本文： | 赵晓峰,宋静,李娟,唐伟,龙健,毛娟,吕品洁,潘云雨.决策单元-多点增量采样(DUMIS)在镍污染地块基坑清挖效果评估中的应用[J].环境科学研究,2021,34(6):1449-1455. |
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| 作者姓名： | 赵晓峰 宋静 李娟 唐伟 龙健 毛娟 吕品洁 潘云雨 |
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| 作者单位： | 贵州师范大学地理与环境科学学院,贵州 贵阳 550001;中国科学院南京土壤研究所,江苏 南京 210008;中国科学院南京土壤研究所,江苏 南京 210008;中国科学院大学,北京 100049;贵州师范大学地理与环境科学学院,贵州 贵阳 550001;中国科学院南京土壤研究所,江苏 南京 210008;贵州师范大学,贵州省山地环境信息系统与生态环境保护重点实验室,贵州 贵阳 550001;安徽师范大学生命科学学院,安徽 芜湖 241000;中国科学院南京土壤研究所,江苏 南京 210008;南京中荷寰宇环境科技有限公司,江苏 南京 210009 |
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| 基金项目： | 国家标准化委员会推荐性国家标准制定项目“土壤质量决策单元-多点增量采样法”No.20193378-T-326贵州省科技计划项目No.[2019]1238贵州省教育厅项目No.Grant Nos. KY[2018]040 |
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| 摘 要： | 为评估现行采样方法在土壤清挖效果评估中的不确定性，以某Ni污染地块土壤清挖后遗留的基坑坑底为研究对象，用现行采样方法和决策单元-多点增量采样方法（Decision unit multi increment sampling，DUMIS）分别采集基坑坑底土壤，分析土壤中w（Ni）的变化情况，并评估DUMIS方法现场采样和室内制样的误差.结果表明:①现行采样方式下，7个坑底采样单元（每个采样单元9点混合）中土壤w（Ni）的变异系数为71.7%，属强变异；现场平行双样w（Ni）的相对偏差为42.6%，不符合平行双样最大允许误差要求；所有样品的w（Ni）均未超过土壤清理目标值（90.5 mg/kg），但个别采样单元的土壤w（Ni）较接近清理目标值.②DUMIS方式下，将基坑底部划分为一个决策单元，均匀布设50个分样采样点位，并在现场采样和实验室制样过程均进行3次重复采样；实验室制样三重复w（Ni）的相对标准偏差（Relative standard deviation，RSD）分别为1.3%、1.5%和1.7%，现场采样三重复w（Ni）的RSD为4.0%，数据精度较高；基坑坑底土壤w（Ni）的平均值为36.6 mg/kg，远低于土壤清理目标值.研究显示，DUMIS方法样本代表性强，数据重现性好，决策可靠，适合用于基坑清挖效果评估.
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| 关 键 词： | 决策单元 多点增量采样 镍(Ni) 样品代表性 数据精度 |
| 收稿时间： | 2020-10-15 |
Application of Decision Unit-Multi Increment Sampling (DUMIS) in Effect Assessment of Pit Excavation at a Ni Contaminated Site |
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| Abstract: | In order to evaluate uncertainties associated with the existing sampling method for compliance evaluation of soil excavation, the existing sampling method and the Decision Unit Multi Increment Sampling (DUMIS) method were used to collect soil samples from a pit bottom at a Ni-contaminated site. The soil samples were analyzed for the content of Ni and the errors of field sampling and sample preparation were evaluated using the DUMIS method. The results showed that: (1) According to the existing sampling method (9 subsamples per subarea), the Ni content in the soil samples from 7 subareas of the pit bottom had high heterogeneity with a variation coefficient of 71.7%. The relative deviation of field duplicate samples was 42.6%, which exceeded the maximum allowable errors of duplicate samples. The Ni content in all soil samples was below the remediation target (90.5 mg/kg) with a few samples having Ni content close to the target value. (2) According to the DUMIS method, 50 increments were evenly distributed at the pit bottom, which was considered one decision unit. Triplicates were prepared for field sampling and sample preparation. The relative standard deviation (RSD) of Ni in the triplicate samples was 1.3%, 1.5% and 1.7%, respectively. The RSD of Ni in field triplicate samples was 4.0%, which indicated high data quality. The average Ni content in soils at the pit bottom was 36.6 mg/kg, which was far below the target value. The results show that the DUMIS method is suitable for compliance assessment of soil excavation due to its robust sample representativeness, good data reproducibility, and reliability in decision-making. |
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