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Böhme F Rinklebe J Stärk HJ Wennrich R Mothes S Neue HU 《Environmental science and pollution research international》2005,12(3):133-135
Background Estimations of gaseous mercury volatilization from soils are often complex, stationary and expensive. Our objective was to develop a mobile and more simple, easy to handle and more cost-effective field method allowing rapid estimates of potential Hg emissions from soils.
Methods. The study site is located in Germany, about 100 kilometers south-westerly of Berlin and influenced by the river Elbe and its tributary Saale river. The site is representative for a lot of other floodplain locations at the river Elbe and highly polluted with Hg and other heavy metals. For our study we developed a system consisting of a glass chamber gas, two gold traps, a battery operated pump and a gas meter. Adsorbed total gaseous mercury (TGM) in the gold traps was determined by use of atomic absorption spectrometry (AAS).
Results and Discussion. In contrast to the common used flux chambers we designed a chamber without inlet and named it gas suck up chamber (GSC). TGM fluxes determined with the GSC showed a very close linear correlation (r = 0.993) between the TGM content in the gold traps and the corresponding pumped gas volume. The TGM adsorbed, increased proportional with increasing gas volume indicating homogenous concentrations of gaseous mercury in the soil air sucked. In contrast to the commonly used dynamic flux chamber with the aim of precisely measuring actual fluxes of Hg from a defined soil area, we focused on developing of a measurement system which will allow rapid estimates of potential Hg emissions of a site. Earlier research at the study site indicated a high potential for releasing volatile Hg from the soil to the atmosphere. Indeed, due to the high Hg content of the soil significant amounts of TGM could be detected and no shortage was reached.
Conclusion. Our initial measurements are still too few in number neither to generalize the achieved results nor discuss controlling factors and processes. However, we are pleased to communicate that the developed GSC is well suited to become an effective sampling set up to rapidly estimate the magnitude of Hg volatilization from soils.
Outlook. Further measurements at other polluted locations are necessary to verify the GSC method. In addition the use of a mercury analyzer instead of gold traps is planned for faster risk assessments. 相似文献
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Hg、Cd对阿匍虾虎鱼及黑褐新糠虾的急性毒性影响 总被引:2,自引:2,他引:2
通过在水中添加重金属Hg、Cd的方法,获得了这两种金属对阿匍虾虎鱼和风褐新糠虾的96h半致死浓度(LC50),结果表明Hg对阿匍虾虎鱼和黑褐新糠虾的96h急性毒性要比Cd的大,且Hg、Cd对黑褐新糠虾的96h急性毒性要比阿匍虾虎鱼的大。 相似文献
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应用大流量大气采样器采集的TSP样品测定了长春市4个功能区及一个对照点的大气颗粒汞浓度。结果表明,大气颗粒汞体积浓度(Cv)与单位重量颗粒物上的汞含量(Cm)在时间上呈相似的变化趋势,采暖期高于非采暖期。而在空间上则相反,Cv市区大于对照点,对Cm则对照点大于市区,说明了大气颗粒汞主要结合在细粒径的颗粒物上。TSP与大气颗粒汞浓度呈正相关关系,它是大气颗粒汞浓度的决定性因素;降水是影响大气颗粒汞的主要气象因子,燃煤与地面扬尘是大气颗粒汞的两个主要来源。 相似文献
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贵州梵净山自然保护区大气汞的沉降 总被引:7,自引:0,他引:7
以铜仁汞矿为点源,研究对梵净山汞的辐射、沉降及流通影响.在海拔500m的梵净山定位测定,应用Mosbag方法,评价梵净山Hg的干湿沉降的累积是115μg·m-2·a-1,干沉降大约占总沉降的50%,通过测定苔藓生物量和Hg含量估算Hg的总沉降量为850μg·m-2·a-1,Hg的流通量平均为210μg·m-2·a-1,Hg的总沉降占总流通量80%.Hg在梵净山沉降累积随高度变化关系明显,海拔2000m以下时汞的沉降累积量较大,和苔藓植物指示汞含量变化关系相一致. 相似文献