Degradation, Metabolism, and Bound-Residue Formation and Release of Tetrabromobisphenol A in Soil during Sequential Anoxic鈥揙xic Incubation

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• 作者：Jie Liu ; Yongfeng Wang ; Bingqi Jiang ; Lianhong Wang ; Jianqiu Chen ; Hongyan Guo ; Rong Ji
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：August 6, 2013
• 年：2013
• 卷：47
• 期：15
• 页码：8348-8354
• 全文大小：353K
• 年卷期：v.47,no.15(August 6, 2013)
• ISSN：1520-5851

文摘

Tetrabromobisphenol A (TBBPA) is one of the most commonly used flame retardants and has become an environmental contaminant worldwide. We studied the fate of ¹⁴C-labeled TBBPA in soil under static anoxic (195 days) and sequential anoxic (125 days)鈥搊xic (70 days) conditions. During anoxic incubation, TBBPA dissipated with a half-life of 36 days, yielding four debromination metabolites: bisphenol A (BPA) and mono-, di-, and tribrominated BPA. At the end of anoxic incubation, all four brominated BPAs completely disappeared, leaving BPA (54% of initial TBBPA) as the sole detectable organic metabolite. TBBPA dissipation was accompanied by trace mineralization (<1.3%) and substantial bound-residue formation (35%), probably owing to chemical binding to soil organic matter. Subsequent oxic incubation was effective in degrading accumulated BPA (half-life 11 days) through mineralization (6%) and bound-residue formation (62%). However, 42% of the anoxically formed bound residues was released as TBBPA and lower brominated BPAs, which were then persistent during oxic incubation. Our results provide the first evidence for release of bound residues during alteration of the redox environment and indicate that sequential anoxic鈥搊xic incubation approaches鈥攃onsidered effective in remediation of environments containing halogenated xenobiotics鈥攄o not completely remove xenobiotics from environmental matrices.