• 关键词：砷  铁  地下水  共沉淀  自净作用

• 基金项目：

• 黄昌勇
• 浙江农业大学土化系,杭州

• 谢正苗
• 浙江农业大学土化系,杭州

• 陈一定
• 浙江农业大学土化系,杭州

• 卓苏能
• 浙江农业大学土化系,杭州

• 摘要：研究了中国水稻研究所皇天畈试验场被砷、铁污染的地下深井水的自净作用。结果表明,其自净机制是地下深井水抽出地面后,由于体系的氧化还原势瞬时提高,Fe²⁺氧化成Fe³⁺,As³⁺氧化成As⁵⁺。Fe³⁺水解后,形成Fe(OH)₃,并聚合,水中的As⁵⁺被氢氧化铁吸附后,形成共沉淀,沉降在底部。实验证明,若提高深井水的氧化势,则能加速自净的进程。

• Abstract：Self-purification of arsenic and iron polluted groundwater(up to 0.08 mg/L and 6-8 mg/L respectively) on Huangtianfan rice experimental farm was studied. It was found that after being pumped out, the redox potential of the groundwater increased and a substantial Fe(Ⅱ) was oxidized into Fe(Ⅲ) which completely hydrolyzed during a period of 10 minutes. The arsenic in the water was adsorbed on the ferric hydroxide and removed by coprecipitation. The process of the self-purification could be promoted by H₂O₂ addition.

• Key words：arsenic  iron  groundwater  coprecipitation  self-purification

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