Isomer-Specific Degradation of Branched and Linear 4-Nonylphenol Isomers in an Oxic Soil

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• 作者：Jun Shan ; Bingqi Jiang ; Bin Yu ; Chengliang Li ; Yuanyuan Sun ; Hongyan Guo ; Jichun Wu ; Erwin Klumpp ; Andreas Sch盲ffer ; Rong Ji
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：October 1, 2011
• 年：2011
• 卷：45
• 期：19
• 页码：8283-8289
• 全文大小：913K
• 年卷期：v.45,no.19(October 1, 2011)
• ISSN：1520-5851

文摘

Using ¹⁴C- and ¹³C-ring-labeling, degradation of five p-nonylphenol (4-NP) isomers including four branched (4-NP₃₈, 4-NP₆₅, 4-NP₁₁₁, and 4-NP₁₁₂) and one linear (4-NP₁) isomers in a rice paddy soil was studied under oxic conditions. Degradation followed an availability-adjusted first-order kinetics with the decreasing order of half-life 4-NP₁₁₁ (10.3 days) > 4-NP₁₁₂ (8.4 days) > 4-NP₆₅ (5.8 days) > 4-NP₃₈ (2.1 days) > 4-NP₁ (1.4 days), which is in agreement with the order of their reported estrogenicities. One metabolite of 4-NP₁₁₁ with less polarity than the parent compound occurred rapidly and remained stable in the soil. At the end of incubation (58 days), bound residues of 4-NP₁₁₁ amounted to 54% of the initially applied radioactivity and resided almost exclusively in the humin fraction of soil organic matter, in which chemically humin-bound residues increased over incubation. Our results indicate an increase of specific estrogenicity of the remaining 4-NPs in soil as a result of the isomer-specific degradation and therefore underline the importance of understanding the individual fate (including degradation, metabolism, and bound-residue formation) of isomers for risk assessment of 4-NPs in soil. 4-NP₁ should not be used as a representative of 4-NPs for studies on their environmental behavior.