Experimental in Situ Transformation of Pb Smelter Fly Ash in Acidic Soils

详细信息    查看全文

• 作者：Vojt臎ch Ettler ; Martin Mihaljevi膷 ; Ond艡ej 艩ebek ; Tom谩拧 Matys Grygar ; Mariana Klementov谩
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：October 2, 2012
• 年：2012
• 卷：46
• 期：19
• 页码：10539-10548
• 全文大小：384K
• 年卷期：v.46,no.19(October 2, 2012)
• ISSN：1520-5851

文摘

Soils in the vicinity of nonferrous metal smelters are often highly polluted by inorganic contaminants released from particulate emissions. We used a technique with double polyamide experimental bags (1-渭m mesh) to study the in situ transformation of fly ash (FA) from a secondary Pb smelter in acidic soil profiles. Between 62 and 66% of the FA dissolved after one year鈥檚 exposure in the soils, leading to complete dissolution of primary caracolite (Na₃Pb₂(SO₄)₃Cl) and KPb₂Cl₅, with formation of secondary anglesite (PbSO₄), minor PbSO₃, and trace carbonates. Release of Pb was pH-dependent, whereas not for Cd and Zn. Significant amounts of metals (mainly Cd and Zn) partitioned into labile soil fractions. The field data agreed with laboratory pH-static leaching tests performed on FA, which was washed before the experiment to remove soluble salts. This indicates that appropriate laboratory leaching can accurately predict FA behavior in real-life scenarios (e.g., exposure in soil).