• 关键词：

• 基金项目：

• 胡国廉
• 冶金部地球物理探矿公司

• 摘要：对21个金属矿区作了调查,发现埋藏深达300m或被160m厚土壤覆盖的矿体以及富汞岩石在其上方土壤中含汞量明显增高。本工作初步探讨了含汞地质体中汞的迁移和转化。试验表明,地质体中汞呈多种存在形式,其中汞可转化为气态和可溶态,并沿岩石孔隙和断裂构造向上迁移。含汞硫化物中汞的迁移是与汞的含留及其存在形式、矿物组成、地下水的性质和活动以及迁移通道的发育程度有关。在含氯离子浓度高的地下水条件下,可溶性汞将以稳定络合物形式长距离迁移。土壤中的有机质,铁、锰高价氧化物,粘土矿物等对表层土壤中汞的富集有重要影响。

• Abstract：Mercury contamination caused by apparent increase of Hg content in soil, air and near-surface ambient air has been observed through mercury-riched rocks and ore bodies even at a depth of 300m or beneath a thick, up to 160m, overburden.The piper presented aims at making a brief discussion on relation between transformation-migration process of mercury-bearirg sulphides ar.d pollution sources.Mercury exists in various chemical forms in geological bodies. However, it has been proved, under both laboratory ar.d natural cor.ditlons, that it can transform into gas phase and in soluble form, and migrate through porous rocks and fractures.According to experimented results and theory of electrochemical dissolution of minerals, further deduction has been given that transformation-migration of mercury in sulphides is related with mercury content and its form, mineral association, chemical property and activity of underground water and development of migration channels.Soluble mercury would migrate in lorg distance via the form of a stable complex under existence of high level chloride in underground water.By means of continuous accumulation, organic substances, ferric oxide, manganese binoxides and clay minerals in soils all exert an important influence on supergene enrichment of mercury in the upper layer of soil profiles.

• Key words：

• 
  摘要点击次数： 2194 全文下载次数： 2281