聚氯乙烯涉水管材中氯乙烯单体的溶解沉淀-顶空气相色谱测定法  

Determination of vinyl chloride monomer in pvc pipes for drinking water supply by dissolution precipitation-headspace-gas chromatography

作　　者：顾显显 朱铭洪[1] 姜新[1] GU Xian-xian;ZHU Ming-hong;JIANG Xin(Institute of Physics and Chemistry,Jiangsu Center for Disease Control and Prevention,Nanjing,Jiangsu 210009,China)

机构地区：[1]江苏省疾病预防控制中心理化所,江苏南京210009

出　　处：《环境与健康杂志》2024年第9期820-823,共4页Journal of Environment and Health

摘　　要：目的建立聚氯乙烯(PVC)涉水管材中氯乙烯单体的溶解沉淀-顶空气相色谱测定法。方法选择VF-624毛细管柱为分离色谱柱,用3 ml的N,N-二甲基乙酰胺(DMA)溶液先溶解PVC管材,再加入1 ml水进行沉聚。在80℃平衡20 min的条件下顶空进样进行气相色谱分析。结果氯乙烯在0.02~0.25 mg/L的线性范围内线性关系良好,r=0.9995。该方法的检出限为0.016 mg/kg,平均回收率为86.8%~92.2%,RSD为2.2%~4.7%。结论该方法具有操作简单快速、灵敏度高、准确度和精密度好等优点,可用于PVC涉水管材中氯乙烯单体的检测。Objective To establish a method for the determination of vinyl chloride monomer in PVCpipes for drinking water supply by dissolution precipitation-headspace-gas chromatography.Methods VF-624 capillary column was used as the separation column.PVC pipes were dissolved with 3 ml of N,N-dimethylacetamide(DMA)solution,and then added 1 ml water for precipitation.Headspace gas chromatographic analysis was carried out at 80℃equilibration for 20 min.Results The linearity of vinyl chloride was good in the range of 0.02-0.25 mg/L,with correlation coefficient of 0.9995.The average recoveries were 86.8%-92.2%,while the relative standard deviations(RSD)were 2.2%-4.7%,and the limit of detection was 0.016 mg/kg.Conclusion The method has the advantages of simple operation,high sensitivity,good accuracy and precision,and can be used for the determination of vinyl chloride monomer in PVC pipes for drinking water supply.

关 键 词：顶空气相色谱法 溶解沉淀 氯乙烯 N N-二甲基乙酰胺 

分 类 号：O657.6[理学—分析化学]