Arsenic, antimony and mercury chemical forms and behavior in volcanic emissions

收集了21种不同于萨摩岩岛火山温度的富马酚气体。凝结水中汞浓度为120 ~ 13.5万ng/l。汞与氯离子浓度呈高度正相关。这一事实表明富马酸气体中的汞有可能以氯化物的形式排出。然而，利用热力学数据计算化学平衡，否定了汞在富马酚气体中以氯化物形式释放的可能性。然而，汞排放的根源并不简单，因为富马酸温度与汞浓度之间并没有相关性。得到了当温度较高时，汞以金属汞蒸气的形式存在于还原性富马酚气体中的结果。并对主要分布在南九州地区的地热水和矿区周围地表水以及地下水中砷、锑的形态分析方法进行了详细的考察，建立了分析方法。因此，砷、锑反映了该地区的地质特征。并证明了低氧化条件下砷、锑在地下等还原性大气中的化学形态。

21 fumarolic gases which temperature differed from Satsuma Iwojima Volcano were collected. The mercury concentration in the condensed water is 120〜135,000 ng/l. There was high positive correlation between mercury and chloride ions concentration. This fact indicates the possibility in which the mercury in the fumarolic gas is discharged in the form of chloride. However, the possibility of the emission in the form of the chloride was denied that mercury chemical form in fumarolic gas from the calculation of chemical equilibrium using thermodynamic data. However, mercury emission root is not simple, because there is no correlation between fumarolic temperature and mercury concentration. The result which the mercury existed in the reductive fumarolic gas in the form of metallic mercury vapor, as the temperature is high, was obtained. And, the speciation analysis method of geothermal water mainly on South Kyushu and surface water around the mine and arsenic in the groundwater, antimony were examined in detail, and the analysis method was established. As the result, arsenic, antimony reflect the geologic feature of the region. And, it was proven that the chemical form of the low oxidation condition was leading for arsenic, antimony in reductive atmosphere such as the underground.