研究报告
李韵姿,何睿文,韩永和,向萍,罗军,崔昕毅.胃肠模拟体外法的生理参数对室内灰尘中邻苯二甲酸酯与磷系阻燃剂的生物有效性的影响[J].环境科学学报,2016,36(5):1841-1848
胃肠模拟体外法的生理参数对室内灰尘中邻苯二甲酸酯与磷系阻燃剂的生物有效性的影响
- Influence of parameters in physiologically-based extraction test on the bioaccessibility of phthalate esters and phosphorus flame retardant in indoor dust
- 基金项目:国家自然科学基金青年科学基金项目(No.21307055);江苏省自然科学基金青年科学基金项目(No.BK20130558)
- 李韵姿
- 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210046
- 何睿文
- 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210046
- 韩永和
- 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210046
- 向萍
- 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210046
- 罗军
- 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210046
- 崔昕毅
- 污染控制与资源化研究国家重点实验室, 南京大学环境学院, 南京 210046
- 摘要:室内灰尘吞食暴露是邻苯二甲酸酯与磷系阻燃剂的主要暴露途径,测定室内灰尘中该类有机污染物的生物有效性对其暴露风险评价至关重要.本研究选择胃肠模拟体外方法-生理原理提取法(PBET)法测定室内灰尘中邻苯二甲酸二正丁酯(Dibutyl phthalate,DBP)、邻苯二甲酸丁基苄基酯(Butyl benzyl phthalate,BBP)、邻苯二甲酸二(2-乙基己基)酯(Di(2-ethylhexyl)phthalate,DEHP)和三(2-氯乙基)磷酸酯(Tris(2-chloroethyl)phosphate,TCEP)的生物有效性.研究了PBET法中胆盐含量、模拟肠液pH值、液固比及同时摄入奶粉等生理参数对生物有效性的影响.结果表明,4种有机污染物的生物有效性从1.5%(DEHP)到52%(TCEP),随污染物辛醇水分配系数的增加而降低.随着模拟液胆盐含量增加,DBP、BBP与DEHP的生物有效性逐渐增加,并在10 g·L-1附近达到最大值后趋于平稳.TCEP由于其较好的水溶性,生物有效性并未随着胆盐含量的增加而明显变化.奶粉含量的增加则显著增加了DBP、BBP、DEHP和TCEP的生物有效性,在10 g·L-1附近达到最大值后普遍呈现下降趋势.随着液固比的增加,DBP和DEHP的生物有效性显著提升,然而BBP与TCEP的生物有效性却未发生明显改变.在pH 6~8范围内,均未对4种有机物的生物有效性产生显著影响.
- Abstract:Incidental ingestion of indoor dust is an important exposure pathway for phthalate esters (PAEs) and phosphorus flame retardants (PFRs). The bioaccessibility of these compounds in indoor dust is essential for the risk assessment. In the current study, bioaccessibility of dibutyl phthalate (DBP), butyl benzyl phthalate (BBP), di (2-ethylhexyl) phthalate (DEHP) and tris (2-chloroethyl) phosphate (TCEP) in indoor dust was measured by physiologically based extraction test (PBET). The influences of bile contents, intestinal solution pH, liquid-solid ratio, and the presence of milk powder on the bioaccessibility result were investigated. The bioaccessibility decreased with the increase of contaminant Kow with 52% for TCEP and 1.5% for DEHP. The bioaccessibility of DBP, BBP, and DEHP was positively related with bile contents, and became saturated when bile content was 10 g·L-1. No significant effect of bile was observed for TCEP due to its relatively higher solubility. The bioaccessibility significantly increased in the presence of milk powder, and became stable when milk powder reached about 10 g·L-1. Increasing liquid-to-solid ratio led to increased bioaccessibility of DBP and DEHP but slight change for BBP and TCEP. When pH changed from 6 to 8, there was no significant change for bioaccessibility of all four types of contaminants.
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