微波消解-电感耦合等离子体质谱联用法检测岳阳市3大名优特产中金属元素含量

Determination of metal elements in 3 famous specialties of Yueyang city by microwave digestion-inductively coupled plasma mass spectrometry

中文关键词:  微波消解  电感耦合等离子体质谱法  茶叶  银鱼  莲子  金属元素

英文关键词:microwave digestion  inductively coupled plasma mass spectrometry  tea  whitebait  lotus seed  metal elements

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)测定岳阳市3大名优特产中金属元素含量的分析方法。方法 样品经微波消解后, 采用蠕动泵在线加入内标, 用ICP-MS测定岳阳的茶叶、银鱼、莲子中Pb, Cd, Cr, As, Hg 5种金属元素的含量。结果 各元素在其标准曲线范围内线性关系良好, 检出限为0.0003~0.010 mg/kg, 表明方法的灵敏度较高; 各元素的加标回收率为86.4%~107.9%, 相对标准偏差(relative standard deviation, RSD)为2.84%~8.97%, 表明方法具有较好的准确度和精密度。按照本方法测定大虾国家标准物质(GBW10050), 测量值均在标准值范围内。结论 该方法快速、准确、灵敏度高, 适合大批量样品的分析。

英文摘要:

      Objective To establish a analytical method for the determination of metal elements in three famous species-specific products in Yueyang city by microwave digestion-inductively coupled plasma mass spectrometry (ICP-MS). Methods After microwave digestion, peristaltic pump was used to add the internal standard online. The contents of Pb, Cd, Cr, As and Hg in tea, whitebait and lotus seeds were determined by ICP-MS. Results The linear relationship of each element was good within the standard curve range, and the limits of detection were 0.0003? 0.010 mg/kg. It showed that the sensitivity of the method was high. The standard recoveries of each element were 86.4%?107.9% and relative standard deviations (RSDs) were 2.84%?8.97%. It showed that the method had good accuracy and precision. According to this method, the national standard substance of prawn (GBW10050) was determined, and the measured values were all within the standard range. Conclusion The method is fast, accurate, and sensitive, and suitable for the analysis of large quantities of samples.