饮用水中痕量邻苯二甲酸酯类检测及其迁移规律

发布时间：2018-01-16 15:27

  本文关键词：饮用水中痕量邻苯二甲酸酯类检测及其迁移规律　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 响应面法 高效液相色谱 邻苯二甲酸酯类 饮用水 迁移

【摘要】：本文通过筛选液液萃取过程中萃取液体积、涡旋时间、盐含量、萃取次数等因素对邻苯二甲酸二(2-乙基己基)酯(DEHP)萃取效果的影响,确定水中痕量DEHP的萃取因素。应用响应面法(RSM)辅助优化饮用水中DEHP萃取条件,得到最佳萃取条件为:盐量为16 g/L、涡旋时间为90 s、萃取液体积为5.28 mL。在此实验条件下,DEHP的最大理论回收率为92.91%,实验验证值为92.97%,与理论值相差0.06%。建立了一种快速、简便环保的痕量塑化剂类污染物检测方法。本方法检出限为0.006 mg/L,满足中国国家标准规定的生活饮用水安全标准(0.008 mg/L)要求,且在0.01~15 mg/L范围内线性关系良好(R=0.9996)。本文选取了常见市售四种塑料瓶装水样品进行分析,结果表明,所选市售饮用水中DEHP均未检出,即低于本法的检出限(0.006 mg/L)。此外,本文对PET塑料包装的塑化剂迁移趋势进行了探索,结果表明,温度及时间因素对DEHP迁移量有很大影响,在相同的接触时间条件下,升高温度可以增加迁移速率,DEHP可在短时间内迅速迁移并达到饱和。尤其较高温度(60℃与80℃)条件下,1h后均有较大量迁移的DEHP检出,分别为0.01655 mg/L(60℃)及0.01609mg/L(80℃)。结果为建立DEHP迁移规律的理论模型及实现对污染物的有效降解提供了启发。本文进一步根据迁移数据对健康风险进行了评估,结果显示,危害系数(HQ≤1)、过量生命致癌风险(ELCR)10-4。最后,本文考察了本地水源地生活用水中常见两种邻苯二甲酸酯类物的污染情况。在最佳色谱条件下(流动相:98%甲醇,2%纯净水,流速:1 mL/min,柱温:25℃,检测波长为274 nm,进样量:20μL),邻苯二甲酸二丁酯(DBP)和DEHP能很好的分离检测,DBP在0.02~20 mg/L范围内线性关系良好(γ=0.99976),DEHP在0.06~15 mg/L范围内线性关系良好(γ=0.9996)。对水样的分析实验结果表明,部分水样中此两种邻苯二甲酸酯类(PAEs)的含量已超过中国国家生活饮用水卫生标准(DBP标准限定值0.003 mg/L,DEHP标准限定值为0.008 mg/L),其中DBP的浓度最高可达0.076 mg/L(RSD=2.99%),DEHP的浓度最高为0.0095 mg/L(RSD=5.41%)。因此,PAEs通过饮用水摄入所带来的风险仍然存在,需要根据PAEs的可能来源在水源地环境风险管理中加以防范,特别需对本地工业区的水源加以控制,并开展更多先进的低成本饮用水处理工艺研究及应用。
[Abstract]:In this paper, the effects of extraction volume, vortex time, salt content, extraction times and other factors on the extraction efficiency of di-2-ethylhexyl phthalate (DEHP-) were studied by screening the extraction fluid volume, vortex time, salt content and extraction times during liquid-liquid extraction. The extraction factors of trace DEHP in water were determined. The optimum extraction conditions of DEHP in drinking water were optimized by using response surface method. The optimum extraction conditions were as follows: the salt content was 16 g / L. The vortex time is 90 s and the volume of the extract is 5.28 mL. The maximum theoretical recovery of DEHP is 92.91 and the experimental verification value is 92.97% under this experimental condition. A rapid and simple method for the detection of trace plasticizer pollutants was established with a detection limit of 0.006 mg/L. Meet the national standards for drinking water safety of 0.008 mg / L requirements. The linear relationship is good in the range of 0.01 ~ 15 mg/L. In this paper, four kinds of plastic bottled water samples on the market are selected for analysis. The results show that. No DEHP was detected in the selected drinking water, that is, less than the detection limit of 0.006 mg / L. In addition, the trend of plasticizer migration in PET plastic packaging was explored in this paper. The results show that the temperature and time factors have a great influence on the DEHP transport amount, under the same contact time, the increase of temperature can increase the migration rate. DEHP could migrate rapidly and reach saturation in a short time, especially at 60 鈩，

本文编号：1433709