Jiangsu Key Laboratory for Food Quality and Safety - State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China; Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China.
Jiangsu Key Laboratory for Food Quality and Safety - State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China; Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China.
Ecotoxicol Environ Saf. 2019 Nov 15;183:109569. doi: 10.1016/j.ecoenv.2019.109569. Epub 2019 Aug 24.
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) varied between 3.99 and 36.1 mgL/kg. Path analysis indicated that 59.9% of variation in K 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) ranging from 0.430 to 4.99 d. The residual DBP concentration after 60 d of incubation (R) ranged from 0.756 to 2.15 mg/kg and the residual rates ranged from 3.97% to 9.63%. The K value was significantly positively correlated with t and R. Moreover, soil pH, microbial biomass carbon (C) and OC were identified as dominating factors that explained 84.4% of variation in t. The R data indicated 72.2% of its variability attributable to the combination of OC and C. The orders of the relative importance of dominating factors on the K, t and R were OC > pH > clay, C > pH > OC and OC > C, respectively. This work contributes to better understand the fate of DBP in soils and make scientific decisions about accelerating its dissipation in different soils.
邻苯二甲酸二丁酯（DBP）是一种普遍存在的土壤污染物。我们研究了 20 种农业土壤中 DBP 的吸附、降解和残留情况，旨在确定控制 DBP 命运的主要土壤特性。所有土壤中 DBP 的吸附等温线均很好地符合 Freundlich 模型。吸附系数（K）在 3.99 至 36.1 mg/L/kg 之间变化。路径分析表明，K 的变化有 59.9%可由 pH、有机碳（OC）和粘粒含量的组合来解释。20 种土壤中 DBP 的降解很好地符合一级动力学模型，半衰期（t）范围为 0.430 至 4.99 d。培养 60 d 后残留的 DBP 浓度（R）范围为 0.756 至 2.15 mg/kg，残留率范围为 3.97%至 9.63%。K 值与 t 和 R 呈显著正相关。此外，土壤 pH、微生物生物量碳（C）和 OC 被确定为解释 t 变化的主要因素，占 84.4%。R 数据表明其 72.2%的可变性归因于 OC 和 C 的组合。OC、pH 和粘粒、C、pH 和 OC、OC 和 C 分别是影响 K、t 和 R 的最重要因素的顺序。这项工作有助于更好地了解 DBP 在土壤中的命运，并为在不同土壤中加速其降解做出科学决策。
