Occurrence and degradation characteristics of dibutyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP) in typical agricultural soils of China
Occurrence and degradation characteristics of dibutyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP) in typical agricultural soils of China
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DOI：
10.1016/j.scitotenv.2008.01.001
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发表时间：
2008-04-15
影响因子：
9.8
通讯作者：
Wang, Qunhui
中科院分区：
文献类型：
--
作者：
Xu, Gang;Li, Fasheng;Wang, Qunhui
摘要本研究以哈尔滨和邯郸两个地区的非耕作土壤、农田、温室和菜地为研究对象，分析了邻苯二甲酸二丁酯（DBP）和邻苯二甲酸二（2-乙基己基）酯（DEHP）在土壤中的污染和降解特征。结果表明，DBP在邯郸地区潮土和哈尔滨地区黑土中的残留量分别为3.18 ~ 29.37 mg/kg（平均14.06 mg/kg）和2.75-14.62 mg/kg（平均7.60 mg/kg）。邯郸地区潮土中DEHP残留量为1.15-7.99 mg/kg（平均4.86 mg/kg），哈尔滨地区黑土中DEHP残留量为0.44-4.20 mg/kg（平均2.35 mg/kg）。所有非耕作土壤中含有最低含量的PE，这表明污染物的种类主要来自人类的农业活动。室内实验证实，两种聚乙烯的降解主要是通过微生物过程进行的。黑土微生物种群数量高于潮土，但减少较慢。这些观察结果可能部分解释了黑土中PE污染物残留量低于潮土且降解速率高于潮土的原因。DBP代谢产物的检测表明，DBP的生物降解可能是开始通过酯水解生成邻苯二甲酸单丁酯（MBP）和相应的醇。MBP然后降解为邻苯二甲酸或苯甲酸丁酯，这可能是由微生物脱羧引起的。MBP的两种衍生物通过开环降解形成原儿茶酸酯。(C)2008 Elsevier B. V.保留所有权利。
in this study, we analyze the pollution and degradation characteristics of two kinds of phthalate esters (PEs), dibutyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP), in two kinds of soils collected from non-cultivated, crop, greenhouse, and vegetable fields from the Harbin and Handan Districts, China. The results demonstrate that DBP has relatively high residual levels in the soils, ranging from 3.18 to 29.37 mg/kg in fluvo-aquic soils of the Handan District (average 14.06 mg/kg) and 2.75-14.62 mg/kg in black soils of the Harbin District (average 7.60 mg/kg). Residual levels of DEHP reach 1.15-7.99 mg/kg in fluvo-aquic soils of the Handan District (average 4.86 mg/kg) and 0.44-4.20 mg/kg in black soils of the Harbin District (average 2.35 mg/kg). All non-cultivated soils contain the lowest contents of PEs, suggesting that the kinds of pollutants are largely derived from human agricultural activities. Laboratory experiments verify that the degradations of two kinds of PEs are mainly via microbial processes. The microbial populations are higher and reduce more slowly in black soils than those in fluvo-aquic soils. These observations might partially explain the lower levels of residuals and higher degradation rates of PEs pollutants in black soils than those in fluvo-aquic soils. The detection of DBP metabolites indicates that DBP biodegradation might begin by ester hydrolysis to form monobutyl phthalate (MBP) and corresponding alcohol. The MBP then degrades to phthalic acid or butyl benzoate, which might be possibly caused by microbial decarboxylation. The two derivatives of MBP degrade to form protocatechuate through ring cleavage. (C) 2008 Elsevier B.V. All rights reserved.