Leaching behaviour and environmental risk assessment of heavy metals from electronic solder in acidified soil
2015
Lao, Xiaodong | Cheng, Congqian | Min, Xiaohua | Zhao, Jie | Zhou, Dayu | Li, Xiaogang
The leaching behaviour of Sn and Pb elements from eutectic SnPb solder of electronic waste in acidic soil was investigated through acidification with HCl–H₂SO₄ solution and compared with saline solution. The amounts of Sn and Pb elements leached, when subjected to acidic soil, are higher than those with saline soil. Evidence for the significantly preferential release of Sn into the leachate is provided; the galvanic couple accelerated such preferential release. Surface product analysis reveals the slight damage of SnPb in saline soil. Serious dissolution due to electrochemical reaction and a thick, porous PbSO₄ surface layer are observed in acidified soil, suggesting more severe toxicity potential of Pb in soil rather than in water.
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