Biodegradation of phthalate esters in four agricultural soils: Main influencing factors and mechanisms

生物降解 环境化学 土壤水分 化学 有机质 邻苯二甲酸盐 生物利用度 溶解有机碳 吸附 邻苯二甲酸二丁酯 土壤有机质 腐植酸 环境科学 有机化学 土壤科学 生物 生物信息学 肥料
作者
Jinping Tang,Rong Xin,Decai Jin,Chenggang Gu,Anwei Chen,Si Luo
出处
期刊:International Biodeterioration & Biodegradation [Elsevier BV]
卷期号:147: 104867-104867 被引量:38
标识
DOI:10.1016/j.ibiod.2019.104867
摘要

Phthalate esters (PAEs) are among the frequently detected organic pollutants in agricultural soils. Here, we investigated adsorption and biodegradation behaviors of di-ethyl phthalate (DEP) and dibutyl phthalate (DBP) in the soils collected from four regions in China: Changchun (CC), Changsha (CS), Cangzhou (CZ), and Yinchuan (YC). The results demonstrated that soil organic matter content crucially influenced the adsorption progress. However, the calculated degradation rates of PAEs in the four soils had no significant correlation with their adsorption capacity, suggesting that PAEs' bioavailability might be not the limiting factor governing their degradation. Furthermore, homogeneous biodegradation experiments were performed in the soil solutions extracted from different regional soils. Results showed that biodegradation of PAEs was influenced by the soil solution's pH and its concentration of dissolved organic matter (DOM). To better understand the accelerating mechanism of DOM, bacterial growth and enzyme activity in the presence of Humic acid (HA) and Fulvic acid (FA) were determined, and the degradation of PAEs by intracellular enzymes were also investigated. These results suggested that HA, FA, and other forms of DOM were actively involved in this biodegradation process in two ways: namely, via nutritional support and sequestration of PAEs. We conclude that the actual impact of soil organic matter (SOM) upon PAEs' biodegradation in soils arose from the net outcome of these two opposing effects.
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