GC法测定食品接触用再生PVC中氯乙烯类化合物的迁移量

Determination of Migration of Vinyl Chloride Compounds in Food Contact Recycled Polyvinyl Chloride Materials by Gas Chromatography

中文关键词: 再生聚氯乙烯  氯乙烯  1,1-二氯乙烯  1,1-二氯乙烷  气相色谱

英文关键词: recycled polyvinyl chloride  vinyl chloride  vinylidene chloride  1,1-Dichloroethane  gas chromatography

中文摘要:

      目的 有效考察食品接触用再生聚氯乙烯类材料中氯乙烯、1,1-二氯乙烯和1,1-二氯乙烷的迁移风险。方法 建立测定食品接触用再生聚氯乙烯类材料中氯乙烯、1,1-二氯乙烯和1,1-二氯乙烷在水、酸性、含乙醇、橄榄油和化学替代溶剂中迁移量的气相色谱法。采用DB-624(60 m×250 μm×1.4 μm)毛细管柱对迁移实验后的3种物质进行组分分离，用电子捕获检测器(ECD)进行检测。结果 氯乙烯、1,1-二氯乙烯和1,1-二氯乙烷的色谱分离效果较好，在0.005~0.05 mg/kg内线性关系良好，检出限为0.001 mg/kg，定量限为0.005 mg/kg。当添加量为0.005、0.01和0.02 mg/kg时，3种物质的加标回收率为94.8%~108%，相对标准偏差(n=6)为0.0%~9.0%，均低于10%。结论 该方法具有较好的精密度和准确度，可用于食品接触用再生聚氯乙烯类材料中氯乙烯、1,1-二氯乙烯和1,1-二氯乙烷迁移量的测定。

英文摘要:

      The work aims to evaluate the migration risk of vinyl chloride, vinylidene chloride and 1,1-dichloroethane from food contact recycled polyvinyl chloride materials. A gas chromatography method was developed to determine the migration of vinyl chloride, vinylidene chloride and 1,1-dichloroethane in food contact recycled polyvinyl chloride materials in water, acid, ethanol, olive oil and chemical alternative solvents. The three substances were separated on a DB-624 (60 m×250 μm×1.4 μm) capillary column, and detected with an electrical conductivity detector (ECD). Results showed that vinyl chloride, vinylidene chloride and 1,1-dichloroethane had good chromatographic separation effect and there were good linear relationships for the analytes in the range of 0.005-0.05 mg/kg, with a detection limit of 0.001 mg/kg and a quantitation limit of 0.005 mg/kg. When the addition amounts were 0.005 mg/kg, 0.01 mg/kg and 0.02 mg/kg, the recoveries ranged from 94.8% to 108%, with the relative standard deviations (n=6) of 0.0%-9.0% which was lower than 10%. With high accuracy and good precision, the established method could be used to determine the migration of vinyl chloride, vinylidene chloride and 1,1-dichloroethane in food contact recycled polyvinyl chloride materials.