电感耦合等离子体质谱法测定烘焙纸中13种元素含量及迁移情况研究

Determination of 13 elements of in baking paper by inductively coupled plasma mass spectrometry and study on the migration situation

中文关键词:  电感耦合等离子体质谱法  烘焙纸  元素  迁移

英文关键词:inductively coupled plasma mass spectrometry  baking paper  element  migration

中文摘要:

      目的 建立电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)测定烘焙纸中13种元素的方法, 分析13种元素在几种模拟液中的迁移情况。方法 将13种元素单标标准溶液, 用4%乙酸逐级稀释, 配制成不同浓度的混合标准溶液, 按照选定的仪器工作条件进行上机分析, 绘制标准工作曲线。对13种元素分别进行高、中、低3个浓度水平的加标回收实验, 计算回收率和精密度。检测20个烘焙纸样品的13种元素含量, 分别采用4%乙酸、10%乙醇和异辛烷作为迁移模拟液, 在一定条件下对烘焙纸进行迁移实验, 测定元素的迁移量。结果 该方法线性范围为0.2~200 μg/L, 相关系数均＞0.999、检出限0.0002~0.055 mg/kg。加标回收率在82.6%~116.9%之间, 相对标准偏差(relative standard deviation, RSD)1.6%~4.3%, 烘焙纸中铝、钡、铜3种元素含量较高, 尤其是铝元素, 平均含量为559 mg/kg; 元素在3种迁移模拟液中迁移量的大小顺序为4%乙酸＞10%乙醇＞异辛烷, 在4%乙酸中锂的最大迁移量可高达94.4%, 在10%乙醇中迁移量最大的是钴元素, 迁移量40.9%, 在异辛烷中迁移量最大的是铬元素, 迁移量6.9%。结论 ICP-MS法测定烘焙纸中13种元素, 具有线性范围宽、灵敏度高等优点, 该法适用于烘焙纸等食品接触用纸中多元素的检测分析。各元素在酸性食品模拟液4%乙酸中更易迁移, 在油性食品模拟液异辛烷中迁移最小, 说明烘焙纸接触油脂类食品时, 元素迁移的风险较低。

英文摘要:

      Objective To establish a method for the determination of 13 elements in baking paper by inductively coupled plasma mass spectrometry (ICP-MS), and analyze the migration of 13 elements in several simulated liquids. Methods The 13 elements standard solutions were diluted sequentially with 4% acetic acid to prepare mixed standard solution with different concentration. The standard working curve was drawn according to the selected working conditions. The recoveries and precisions of 13 elements were calculated by standard recovery tests at high, medium and low concentrations respectively. The content of 13 elements in 20 baking paper samples was tested. The 4% acetic acid, 10% ethanol and isooctane were used as the migration simulation solution respectively. The migration test of elements in baking paper was carried out under certain conditions, and the migration of elements was determined. Results The linear range of the method was 0.2?200 μg/L, the correlation coefficient was greater than 0.999, and the detection limit was 0.0002?0.055 mg/kg. The standard recovery rates were 82.6%?116.9% and relative standard deviations (RSDs) were 1.6%?4.3%. The content of aluminum, barium and copper in baking paper were relatively high, especially aluminum, with an average content of 559 mg/kg. The order of element migration in the 3 migration simulation fluids was 4% acetic acid>10% ethanol>isooctane, the maximum migration of lithium in 4% acetic acid could be as high as 94.4%, the maximum migration of cobalt in 10% ethanol was 40.9%, and the maximum migration of chromium in isooctane was 6.9%. Conclusion ICP-MS method has the advantages of wide linear range and high sensitivity for the determination of 13 elements in baking paper, and it is suitable for the determination and analysis of element content and migration in baking paper. The migration of elements in acid food simulant 4% acetic acid is easier than that in oily food simulant isooctane, which indicates that the risk of element migration is lower when baking paper contacts oily food.