摘要
以湖南石门雄黄矿区为研究区域,共采集水样品7个,土壤表层样品23个,采用高效液相色谱-电感耦合等离子体质谱法(HPLC-ICP-MS)对所采集的水样品和土壤样品中的As形态进行了分析研究,并分别利用单因子指数法和生态风险指数法评价了研究区土壤中的As污染程度和生态危害风险.结果表明:流经矿区的黄水河样品中As的含量明显远远高于不流经矿区的水样品中的As含量,水样品中的As主要以As5+形态存在,所占平均比例为96.5%;修复后土壤中的As含量比原污染土壤中的As含量明显降低,修复后土壤中的生物可利用As占21.2%~54.0%,含量范围为3.52~24.90μg/g;原污染土壤中的生物可利用As占12.6%~80.3%,含量范围为37.7~2578.6μg/g,土壤中的生物可利用As主要以无机As(As^3+,As^5+)形态存在且As^5+的含量大于As^3+;原污染土壤中的As污染程度远大于修复后土壤,修复后土壤中的As多属于轻度污染.
A total of 7 water samples and 23 top soils were collected from Shimen realgar mine in Hunan province.The speciation of arsenic in water and soil samples were analyzed using high performance liquid chromatography-inductively coupled plasma mass spectrometry.The degree of arsenic contamination and the risk of ecological hazard in the soil of the study area were evaluated using the single factor index and the ecological risk index.The results indicated that the concentration of arsenic in the yellow river water samples flowing through the mining area is significantly higher than that in the water samples that do not flow though the mining area.The speciation of arsenic in the water samples is mainly As5+,accounting for 96.5%.The content of arsenic in the remediated soil is significantly lower than that in the original contaminated soil.The bioavailable arsenic in the remediated soil account for 21.2%~54.0%,range from 3.52 to 24.90μg/g.The bioavailable arsenic in the original contaminated soil accounted for 12.6%~80.3%,ranging from 37.7 to 2578.6μg/g.The bioavailable arsenic in soil mainly existe in the form of inorganic arsenic(As^3+,As^5+)and the content of As^5+ is higher than that of As^3+.The arsenic pollution of original contaminated soil was much greater than that of the remediated soil,and the arsenic pollution of the remediated soil is mostly mild.
作者
刘崴
胡俊栋
路国慧
Liu Wei;Hu Jundong;Lu Guohui(National Research Center for Geoanalysis,Beijing 100037,China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2020年第4期96-102,共7页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(41301565)
中国地质科学院基本科研业务费项目资助(CSJ202014)
中国地质大调查项目资助(DD20190589)。
关键词
砷
形态
矿区
污染评价
arsenic
speciation
mining area
pollution assessmen
