微波消解—电感耦合等离子体质谱法检测虾中镉含量的工艺优化

Determination of Cd in Shrimps by microwave digestion and inductively coupled plasma mass spectrometry

通过研究过氧化氢量、硝酸量、微波消解时间对虾中镉提取量的影响,优化虾中镉的提取条件。结果表明:在过氧化氢1.5mL、硝酸6mL、微波消解时间17min的条件下,虾中镉的提取量可达到0.043mg/kg。方法检出限为0.01μg/kg,RSD(n=6)小于5%。利用优化后条件对国家标准物质GBW10050(大虾)进行检测验证,结果与标准值基本一致。该方法能够简单、快速、灵敏和准确地检测虾中的重金属镉元素。

The orthogonal array design methods were applied to analyze the influence of H2O2volume/HNO3volume/microwave digestion time three factors and their interaction on the extraction of Cd,select an optimized progress to extract Cd from shrimps.The experimental results showed that when H2O2 volume was 1.0mL,HNO3 volume is 5.0mL,microwave digestion time was 13 minutes and 46 seconds, under these conditions,the contents of Cd reached0.497mg/kg.Determination of GBW10050（big shrimps）showed that contents of Cd have the same results with standards values.Method limits of detection were obtained within the range of 0.01μg/kg,the precision for this method was better than 5%.It allowed simple,rapid,sensitive and accurate determination of Cd in shrimps.