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Major factors dominating the fate of dibutyl phthalate in agricultural soils

文献类型： 外文期刊

作者： Cheng, Jinjin 1 ; Wan, Qun 1 ; Ge, Jing 1 ; Feng, Fayun 1 ; Yu, Xiangyang 1 ;

作者机构： 1.Minist Sci & Technol, State Key Lab Cultivat Base, Jiangsu Key Lab Food Qual & Safety, 50 Zhongling St, Nanjing 210014, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, 50 Zhongling St, Nanjing 210014, Jiangsu, Peoples R China

关键词： Dibutyl phthalate; Sorption; Degradation; Residue; Soil properties; Fate in soil

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2019 年 183 卷

页码：

收录情况： SCI

摘要： Dibutyl phthalate (DBP) is a ubiquitous soil contaminant. We have investigated the sorption, degradation and residue of DBP in 20 types of agricultural soils and aimed to identify the major soil properties that dominate the fate of DBP. Sorption isotherms of DBP in all soils were fitted well with the Freundlich model. The sorption coefficient (K-f) varied between 3.99 and 36.1 mg(1-1/n)L(1/n)/kg. Path analysis indicated that 59.9% of variation in K-f could be explained by the combination of pH, organic carbon (OC) and clay content. Degradation of DBP in the 20 soils was well described by the first-order kinetic model, with half-lives (t(1/2)) ranging from 0.430 to 4.99 d. The residual DBP concentration after 60 d of incubation (R-60) ranged from 0.756 to 2.15 mg/kg and the residual rates ranged from 3.97% to 9.63%. The K-f value was significantly positively correlated with t(1/2) and R-60. Moreover, soil pH, microbial biomass carbon (C-mic) and OC were identified as dominating factors that explained 84.4% of variation in t(1/2). The R-60 data indicated 72.2% of its variability attributable to the combination of OC and C-mic. The orders of the relative importance of dominating factors on the K-f, t(1/2) and R-60 were OC > pH > clay, C-mic, > pH > OC and OC > C-mic, respectively. This work contributes to better understand the fate of DBP in soils and make scientific decisions about accelerating its dissipation in different soils.

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