Tomiyasu Takashi, Kodamatani Hitoshi, Imura Ryusuke, Matsuyama Akito, Miyamoto Junko, Akagi Hirokatsu, Kocman David, Kotnik Jože, Fajon Vesna, Horvat Milena
Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima 890-0065, Japan.
Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima 890-0065, Japan.
Chemosphere. 2017 Oct;184:244-252. doi: 10.1016/j.chemosphere.2017.05.123. Epub 2017 May 23.
The distributions of the total mercury (T-Hg), methylmercury (MeHg), and ethylmercury (EtHg) concentrations in soil and their relationship to chemical composition of the soil and total organic carbon content (TOC, %) were investigated. Core samples were collected from hill slope on the right and left riverbanks of the Idrija River. Former smelting plant is located on the right bank. The T-Hg average in each of the core samples ranged from 0.25 to 1650 mg kg. The vertical T-Hg variations in the samples from the left bank showed no significant change with depth. Conversely, the T-Hg varied with depth, with the surface, or layers several centimeters from the surface, tending to show the highest values in the samples from the right bank. Since the right and left bank soils have different chemical compositions, different pathways of mercury delivery into soils were suggested. The MeHg and EtHg concentrations ranged from n.d. (not detected) to 444 μg kg and n.d. to 17.4 μg kg, respectively. The vertical variations of MeHg and EtHg were similar to those of TOC, except for the near-surface layers containing TOC greater than 20%. These results suggest that the decomposition of organic matter is closely related to organic mercury formation.
研究了土壤中总汞（T-Hg）、甲基汞（MeHg）和乙基汞（EtHg）的浓度分布及其与土壤化学成分和总有机碳含量（TOC，%）的关系。从伊德里亚河左右两岸的山坡采集了岩心样本。以前的冶炼厂位于右岸。每个岩心样本中的T-Hg平均值在0.25至1650mg/kg之间。左岸样本中T-Hg的垂直变化随深度无显著变化。相反，右岸样本中T-Hg随深度变化，表层或距表层几厘米的层往往显示出最高值。由于左右岸土壤的化学成分不同，因此提出了汞进入土壤的不同途径。MeHg和EtHg浓度分别在未检出（n.d.）至444μg/kg和未检出至17.4μg/kg之间。除了TOC大于20%的近表层外，MeHg和EtHg的垂直变化与TOC相似。这些结果表明，有机物的分解与有机汞的形成密切相关。
