“两控区”城市降水、降尘中重金属元素分布特征及其相关性——以都匀市为例

发布时间：2018-06-22 02:24

本文选题：降水 + 降尘　；参考：《生态环境学报》2016年09期

【摘要】：为了解"两控区"降水、降尘中重金属元素的污染现状及其在大气作用过程中的相互影响,于2015年3月—2016年2月,对"两控区"贵州都匀市降水、降尘样品分别进行逐次和逐月采集,利用电感耦合等离子体质谱仪(ICP-MS)对样品中重金属元素(Zn、Mn、As、Cu、Ni、V、Cr、Cd等)进行测定,分析样品中重金属元素的季节分布特征,并对同一种元素在降水和降尘中的相关性进行探讨。研究结果表明:降水中重金属元素的质量浓度范围为0.08~13.80μg·L-1,其中Zn质量浓度最高,其次依次为Mn、As、Cu、Ni、V、Cr、Cd;与《地表水环境质量标准》中Ⅰ类水体标准相比,降水中的重金属元素均未超标;降尘中Cu、As、Cd、Zn较富集,分别为土壤背景值的381.0、2.6、2.7、1.2倍。从季节变化看,降水中多数重金属元素表现为夏季最低,春季最高,降尘中重金属元素的季节变化不明显。降水、降尘中Zn、Mn、As、Cu、Ni、V、Cr、Cd等的沉降量随季节变化具有相似规律性,相关系数分别为0.70、0.66、0.97、0.78、0.53、0.43、0.94、0.67,主要与降雨强度、元素的赋存形态及其在气溶胶中的粒径分布有关。
[Abstract]:In order to understand the pollution status of heavy metal elements in precipitation and dust fall in "two control areas" and their interaction in the process of atmospheric action, precipitation in Duyun City, Guizhou Province, from March 2015 to February 2016, was studied. The dust fall samples were collected step by step and month by month. The heavy metal elements in the samples were determined by inductively coupled plasma mass spectrometer (ICP-MS), and the seasonal distribution characteristics of heavy metal elements in the samples were analyzed. The correlation of the same element in precipitation and dust fall was discussed. The results show that the mass concentration range of heavy metal elements in precipitation is 0.08 ~ 13.80 渭 g / L ~ (-1), among which Zn concentration is the highest, followed by Mn-As-CuCuLi _ (+) V _ (+) Cr ~ (1) CD, and the heavy metal elements in precipitation do not exceed the standard when compared with the "Surface Water Environmental quality Standard". The concentration of Cu _ (2 +) ~ (2 +) ~ (2 +) in dustfall was 1.2 times of that of soil background value (381.0) ~ (2.6) ~ (2. 7) ~ (-1) ~ (-1). In terms of seasonal variation, most heavy metal elements in precipitation are the lowest in summer and the highest in spring, but the seasonal variation of heavy metal elements in dust fall is not obvious. The precipitation and precipitation of Zn ~ (2 +) mn ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +), Zn ~ (2 +) mn ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) and so on, have similar regularity with seasonal variation, and the correlation coefficient is 0.70 ~ 0.6@@
【作者单位】：贵州大学资源与环境工程学院;
【基金】：国家自然科学基金项目(41265008) 贵州省环境保护厅环境科技项目(黔环科[2011]6号) 贵州省重点学科建设项目(黔学位合字ZDXK[2016]11号)
【分类号】：P426.6;X51

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