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砷总是与硫化物共同形成于地热环境中。然而,在地表氧化条件下硫化物与雨水接触后易溶解。在地热环境中硫化物溶解后的二次沉淀物对砷的迁移有着重大的影响。溶解的砷酸盐易被铁的氢氧化物固定,且铁的氢氧化物在大多数的地表氧化条件下都可以稳定存在。地热流体中无定形SiO_2的
Arsenic is always formed together with sulfides in the geothermal environment. However, sulphides readily dissolve upon contact with rain under surface oxidation conditions. The secondary sediment dissolved in the geothermal environment has a significant impact on arsenic migration. Dissolved arsenate is easily immobilized by iron hydroxides, and iron hydroxides are stable under most surface oxidation conditions. Geothermal fluids in amorphous SiO_2