Volatile metals and metalloids in hydrothermal gases.
Volatile metals and metalloids in hydrothermal gases.
复制标题
热液气体中的挥发性金属和准金属。
DOI：
10.1021/es051476r
复制
发表时间：
2006
影响因子：
11.4
通讯作者：
B. Merkel
中科院分区：
文献类型：
--
作者：
B. Planer;B. Merkel
挥发性金属和类金属样品的温泉，水，和热影响的湿地在黄石国家公园。采样是基于通过气体采样室的扩散。通过在1：100稀释的NaOCl中溶解和氧化来稳定收集的气体。采用石墨炉原子吸收法和氢化物发生原子吸收法对氧化样品进行了分析。对于ICP-MS，必须对样品进行多原子同位素干扰的空白校正，特别是23 Na 35 Cl+和23 Na 37 Cl+对58 Ni和60 Ni的干扰以及40 Ar 23 Na+对63 Cu的干扰。根据溶液中捕获的浓度，通过Fick第一定律计算净扩散速率。挥发性硅的最高浓度达到最大值8 g/m3。挥发性镍、钨、锌、铜和钼以前只从人为来源中发现，在热液气体中自然存在，含量在几十到几百微克/立方米之间。重复测量表明，浓度随时间变化很大，这可能是热液状况复杂变化以及微生物活动变化的结果。气相和表面水相之间的全球相关性缺失。
Volatile metals and metalloids were sampled from hot springs, fumaroles, and a hydrothermally influenced wetland in Yellowstone National Park. The sampling was based on diffusion through gas sampling chambers. Collected gases were stabilized by dissolution and oxidation in 1:100 diluted NaOCl. Special procedures were developed to analyze the oxidized samples by GF-AAS and HG-AAS. For ICP-MS, samples had to be blank-corrected for polyatomic isotope interferences, especially by 23Na35Cl+ and 23Na37Cl+ on 58Ni and 60Ni and by 40Ar23Na+ on 63Cu. From the concentrations trapped in solution, net diffusion rates were calculated by Fick's first law. The highest concentrations reached a maximum of 8 g/m3 for volatile silicon. Volatile nickel, tungsten, zinc, copper, and molybdenum, previously only known from anthropogenic sources, occurred naturally in the hydrothermal gases in ranges of tens to hundreds of microg/m3. Replicate measurements indicated significant temporal variations in concentrations, probably the result of complex changes in the hydrothermal regime as well as varying microbial activity. Global correlations between gaseous and superficial aqueous phases were missing.