| 重庆缙云山降水中不同形态汞的含量及其沉降量 |
| 摘要点击 3227 全文点击 1465 投稿时间：2014-09-12 修订日期：2014-10-29 |
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| 中文关键词 汞 汞形态 湿沉降 沉降量 重庆 |
| 英文关键词 mercury mercury species precipitation deposition fluxes Chongqing |
| 作者 | 单位 | E-mail | | 覃蔡清 | 西南大学资源环境学院, 土壤多尺度界面过程与调控重庆市重点实验室, 重庆 400715 | 18883319112@163.com | | 王永敏 | 西南大学资源环境学院, 土壤多尺度界面过程与调控重庆市重点实验室, 重庆 400715 | | | 彭玉龙 | 西南大学资源环境学院, 土壤多尺度界面过程与调控重庆市重点实验室, 重庆 400715 | | | 王定勇 | 西南大学资源环境学院, 土壤多尺度界面过程与调控重庆市重点实验室, 重庆 400715
重庆市三峡库区农业面源污染控制工程技术研究中心, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | dywang@swu.edu.cn |
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| 中文摘要 |
| 于2013年4月至2014年3月连续1 a,利用湿沉降自动采样器采集了重庆缙云山的雨水样品,分析了样品中不同形态汞的含量,并计算其沉降量. 结果表明,降水中总汞(THg)、溶解态汞(DHg)、颗粒态汞(PHg)、活性汞(RHg)、总甲基汞(MeHg)、溶解态甲基汞(DMeHg)、颗粒态甲基汞(PMeHg)的含量范围分别为7.47~120.11、2.51~43.03、2.28~77.99、0.14~15.14、2.58×10-2~101.62×10-2、0.30×10-2~72.29×10-2、1.45×10-2~63.55×10-2 ng·L-1. 在计算各形态汞体积加权平均含量(VWM)的基础上,分别算出其年沉降通量为:42.71、23.51、19.20、5.87、0.61、0.34、0.27 μg·(m2·a)-1. MeHg占THg的比例是0.07%~3.79%(平均1.34%),而PHg占THg的比例以及PMeHg占MeHg的比例分别是10.49%~89.30%(平均49.95%)、4.31%~98.86%(平均43.14%). 除MeHg外,其它形态汞的含量和沉降量都表现出了明显的季节变化特征,THg、DHg、PHg的含量均为冬季最高而夏季最低,RHg的含量在春冬季明显高于秋夏季. THg、DHg、MeHg、DMeHg的沉降量与降雨量具有相同的季节变化趋势,均为春季>夏季>秋季>冬季,RHg的沉降量也是春季最大,而冬季最小. 缙云山大气汞沉降不仅受到降雨量、降雨频率以及其它气象条件的影响,也受到了人为活动的干扰. |
| 英文摘要 |
| Concentrations of mercury (Hg) species in precipitation were measured during the period from April 2013 to March 2014 in Jinyun Mountain, Chongqing, and corresponding deposition fluxes were also estimated. The result showed that the ranges of concentration of total mercury (THg), dissolved mercury (DHg), particulate mercury (PHg), reactive mercury (RHg), total methyl mercury (MeHg), dissolved methyl mercury (DMeHg), particulate methyl mercury (PMeHg) were 7.47-120.11, 2.51-43.03, 2.28-77.99, 0.14-15.14, 2.58×10-2-101.62×10-2, 0.30×10-2-72.29×10-2, and 1.45×10-2-63.55×10-2 ng·L-1, respectively. And their estimated annual deposition fluxes were 42.71, 23.51, 19.20, 5.87, 0.61, 0.34 and 0.27 μg·(m2·a)-1, respectively. The proportion of MeHg in THg ranged from 0.07% to 3.79% with a mean value of 1.34%, and both PHg and PMeHg in precipitation accounted for approximately 50% of THg (ranged from 10.49% to 89.30%) and TMeHg (ranged from 4.31% to 98.86%). Obvious seasonal variations of Hg concentrations and deposition fluxes were observed, with the highest VWM levels of THg, DHg and PHg occurring in winter and the lowest value occurring in summer. And the RHg concentrations in precipitation in winter and spring were significantly higher than those found in summer and autumn. The variations of deposition fluxes of THg, DHg, MeHg, DMeHg had a similar seasonal trend with the rainfall, decreasing from spring to summer and to autumn and then to winter. The maximum deposition fluxes of RHg also appeared in spring and the minimum value occurred in winter. The wet deposition of Hg in Jinyun Mountain was influenced by rain amount, rainfall frequency and other meteorological conditions. Hg levels in the precipitation were also affected by human activities. |
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