Meiselstrasse 14/51, A-1150 Wien, Austria.
Norwegian University of Science and Technology (NTNU), S. P. Andersens veg 15a, 7031 Trondheim, Norway.
Sci Total Environ. 2022 Aug 1;832:155065. doi: 10.1016/j.scitotenv.2022.155065. Epub 2022 Apr 6.
For both, silver (Ag) and mercury (Hg), the median concentrations in an aqua regia extraction of minerogenic top- and subsoil from continental scale geochemical surveys (Australia, China, Europe) are around 0.02 mg/kg. When the soil O horizon is collected as topsoil sample, the concentration of again both elements is higher by about a factor of 10 (range 7-30), with median concentrations around 0.2 mg/kg Ag and Hg. Geochemical maps of top- and subsoil at different scales for both elements display regional patterns which reflect mainly geology, climate and topography. Anthropogenic sources like mines, power plants, or major cities visually occur only as local anomalies. For Ag in organogenic topsoil the maximum possible input due to diffuse contamination is estimated to be in the 0.02 mg/kg range, about 10% of the median concentration in the soil O horizon. For Hg this value is slightly higher at 0.03 mg/kg. In the soil O horizon Hg concentrations show less variability than in the C horizon. Substantial Hg soil contamination should lead to noticeably increased Hg/Ag ratios.
对于银（Ag）和汞（Hg），从大陆规模地球化学调查（澳大利亚、中国、欧洲）的矿源表土和底土的王水提取中，其浓度中位数约为 0.02 毫克/千克。当土壤 O 层作为表土样本收集时，这两种元素的浓度又高出约 10 倍（范围为 7-30），Ag 和 Hg 的浓度中位数约为 0.2 毫克/千克。对于这两种元素的不同规模的表土和底土地球化学图显示了主要反映地质、气候和地形的区域模式。矿山、发电厂或主要城市等人为来源仅作为局部异常出现。对于有机表土中的 Ag，由于弥散污染而可能存在的最大输入估计在 0.02 毫克/千克范围内，约为土壤 O 层中浓度中位数的 10%。对于 Hg，该值略高，为 0.03 毫克/千克。在土壤 O 层中，Hg 浓度的变化小于 C 层。大量的 Hg 土壤污染应导致 Hg/Ag 比值显著增加。
