微波消解-电感耦合等离子体质谱法快速测定 方便面中的重金属

Rapid detection of heavy metals in instant noodles by microwave digestion- inductively coupled plasma-mass spectrometry

中文关键词:  方便面  电感耦合等离子体质谱法  铬  砷  镉

英文关键词:instant noodles  inductively coupled plasma mass spectrometry  Cr  As  Cd

中文摘要:

      目的 建立微波消解前处理-电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry, ICP-MS)快速检测方便面中铬(Cr)、砷(As)、镉(Cd)等重金属的含量。方法 方便面样品经最佳微波消解程序处理后, 采用ICP-MS测定Cr、As、Cd元素的含量; 同时与GB 5009-2014进行对比验证方法的可行性, 并对市售方便面中铬、砷、镉的含量进行检测。结果 对空白样品进行1、5和10 μg/kg 3个水平加标, 平均回收率为96.1%~104.7 %, 相对标准偏差小于5.52%。Cr、As和Cd元素在0~50 μg/kg浓度范围内线性关系良好, 相关系数r均大于0.99。本方法测得不同品牌方便面铬浓度在34.78~131.67 μg/kg之间, 总砷的浓度在8.33~21.76 μg/kg之间, 镉的浓度在11.42~21.52 μg/kg之间, 均未超出国家标准限量。结论 该方法快速准确, 可适用于方便面中重金属含量的测定。

英文摘要:

      Objective To establish a method for determination of heavy metals including Cr, As and Cd in instant noodles by inductively coupled plasma-mass spectrometry (ICP-MS) with microwave digestion pretreatment. Methods Instant noodle samples were digested by microwave and then detected by ICP-MS for measurement of the content of Cr, As and Cd. At the same time, the method was compared with GB 5009-2014 to verify the feasibility and the content of heavy metals (Cr, As, Cd) in instant noodles sold in Jining city was detected. Results The recoveries spiked at 3 levels of 1, 5 and 10 μg/kg were 96.1%~104.7% with RSDs less than 5.52%. Cr, As, and Cd had good linear relationships in 0~50 μg/kg with coefficient correlations larger than 0.99. The content of Cr in instant noodle were in the range of 34.78~131.67 μg/kg, the content of As were in the range of 8.33~21.76 μg/Kg and the content of Cd were in the range of 11.42~21.52 μg/kg, all of them did not exceed the national standards. Conclusion The method is rapid and precise, which is suitable for determination of heavy metals in instant noodles.