微波消解-电感耦合等离子体质谱法测定食品接触用纸制品中42种无机元素

Determination of 42 kinds of inorganic elements in food contact paper articles by microwave digestion-inductively coupled plasma mass spectrometry

中文关键词:  无机元素  微波消解  电感耦合等离子质谱法  纸制品

英文关键词:inorganic elements  microwave digestion  inductively coupled plasma mass spectrometry  paper articles

中文摘要:

      目的 建立微波消解-电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)测定食品接触用纸制品中铅、砷、铜等42种无机元素含量的分析方法。方法 纸制品经微波消解后, 各元素含量由电感耦合等离子体质谱法进行分析, 在动能歧视(kinetic energy discrimination, KED)模式下增加响应值, 选择锗、铑、锆、铪、铼元素作为内标校正检测结果。结果 该方法可在约3.5 min内完成42种元素的测定, 各元素方法定量限为0.02~0.1 mg/kg, 且线性关系良好, r2>0.995, 加标回收率为80%~120%, 精密度为0.3%~9.9%(n=6)。结论 该方法快速、灵敏, 适用于纸制餐具的无机元素检测。铬、铜、锰、锶等元素在纸杯、纸碗、纸盒中检出率较高, 需引起消费者及监管部门的重视。

英文摘要:

      Objective To establish a method for the determination of lead, arsenic and copper, total 42 kinds of elements in food contact paper articles by inductively coupled plasma mass spectrometry analytical method with microwave digestion. Methods Paper sample was acid digested under microwave condition, multi elements were determined by inductively coupled plasma mass spectrometry (ICP-MS) in KED (kinect energy discrimination) mode, germanium, rhodium, zirconium, hafnium, and rhenium were used as internal elements to correct the results. The method was applied on determining general food contact paper articles in market. Results The method could analysis 42 kinds of elements determination in 3.5 minutes. The limits of quantative were in a range of 0.02? 0.1 mg/kg, regression coefficient was greater than 0.995, the recoveries was 80%?120%, and precision are 0.3% to 9.9% (n=6). Conclusion This method is fast, accurate, and suitable for determining paper articles. The detection rate of chromium, copper, manganese, strontium and other elements in paper cups, paper bowls and cartons is high, which needs to be paid attention to by consumers and regulatory authorities.