Research of parabens and its potential toxicity risk in lakes of Guangzhou

Abstract

为研究广州市湖泊水体中的防腐剂及其毒性,在广州市选择15个湖泊采集水样,采用液液萃取-气质联用法对湖泊水体中的对羟基苯甲酸甲酯、对羟基苯甲酸乙酯等5种防腐剂进行浓度检测和毒性分析. 结果表明:广州市区内15个湖泊水体中均检出防腐剂,但其浓度略低于国外天然水体中的浓度,溶解相的防腐剂平均浓度为5.06 ng/L,颗粒相的平均浓度为0.78 ng/L;广州市区的湖泊水体中溶解相浓度最高的防腐剂为对羟基苯甲酸丁酯,占总量的30.45%,对羟基苯甲酸苯甲酯所占比例最小,占6.71%;以防腐剂对发光细菌光强的抑制强弱来表征其毒性的大小,对羟基苯甲酸苯甲酯的毒性最强,对广州市湖泊水体环境的影响最大.;In this study, the method of GC-MS with liquid-liquid extraction was adopted to analyze the parabens in 15 lakes of Guangzhou. The results showed that: parabens were detected from all the sampling sites while the content was not high contrasted with foreign waters. The average content of parabens in aquatic matter is 5.06 ng/L, and that in suspended particulate matter is 0.78 ng/L. Concentration of Butyl paraben is more than other parabens in water, accounted for 30.45% of the total in aquatic matter, while concentration of Benzyl paraben is the lowest, accounted for 6.71%. According to the intensity of the suppress of the luminous bacteria, we can characterize the intensity of toxicity of parabens. The results show that Benzyl paraben has the strongest toxic among the five parabens, and has the biggest impact on the environment of lakes in Guangzhou.