顶空-气相色谱法测定聚丙烯腈类食品接触材料中3种腈类化合物迁移量规律

Determination of migration of 3 kinds of nitrile compounds in polyacrylonitrile food contact materials by headspace-gas chromatography

中文关键词:  顶空气相色谱法  聚丙烯腈类食品接触材料  腈类化合物  迁移量

英文关键词:headspace gas chromatography  polyacrylonitrile food contact materials  nitrile compounds  migration

中文摘要:

      目的 建立顶空-气相色谱法测定聚丙烯腈类食品接触材料中乙腈、丙烯腈和丙腈等3种腈类化合物迁移量的分析方法。方法 通过优化模拟物体积、水基模拟物中盐及其用量和分流比、载气流速、升温程序、平衡温度与时间等色谱条件, 实现了对3种腈类化合物迁移量的常规、快速分析, 研究丁腈橡胶、聚丙烯腈-苯乙烯、聚丙烯腈-丁二烯-苯乙烯3种材质阳性产品在不同模拟物、不同时间和不同温度条件下3种腈类化合物迁移量规律。结果 3种腈类化合物在0.005~0.100 mg/L浓度范围内, 线性相关系数均大于0.9960, 方法定量限为1.57~3.77 μg/kg, 低、中、高浓度的回收率84.3%~108.9%, 相对标准偏差值为1.7%~9.7%。结论 丁腈橡胶在水模拟物中容易迁移出丙烯腈, 而聚丙烯腈-丁二烯-苯乙烯和聚丙烯腈-苯乙烯产品在50%乙醇模拟物中容易迁移出丙烯腈, 3种腈类化合物均随模拟时间的延长和温度的升高, 越容易迁移到食品模拟物中。

英文摘要:

      Objective To establish a method for the determination of a total of 3 kinds of nitrile compounds containing acrylonitrile, acetonitrile and propane nitrile in polyacrylonitrile food contact materials by headspace-gas chromatography. Methods The conventional rapid analysis of the migration of 3 kinds of nitrile compounds was achieved by optimizing the volume of the simulant, the salt and its amount in the water-based simulant and the split ratio, carrier gas flow rate, temperature program, equilibrium temperature and time, which could be analyzed regularly and fastly. The migration rules of 3 kinds of nitrile compounds in nitrile-butadiene rubber, polyacrylonitrile- styrene and polyacrylonitrile-butadiene-styrene under different simulators, different time and different temperature conditions were studied. Results The linear correlation coefficients of 3 kinds of nitrile compounds in the concentration range of 0.005-0.100 mg/L were greater than 0.9960, the limits of quantity were 1.57-3.77 μg/kg, the recoveries of low, medium and high concentrations were 84.3%-108.9%, and the relative standard deviations were 1.7%-9.7%. Conclusion Nitrile rubber easily migrates out of acrylonitrile in water simulants, while polyacrylonitrile-butadiene-styrene and polyacrylonitrile-styrene products easily migrate out of acrylonitrile in 50% ethanol mimics. The longer the time and the higher the temperature, the easier it is for the nitrile compounds to migrate to food simulators.