电感耦合等离子体串联质谱法测定农作物样品中硫元素

采用微波消解–电感耦合等离子体串联质谱法(ICP–MS/MS)测定农作物样品中硫元素,建立了农作物样品中硫元素高灵敏度分析的检测方法。分别对测量模式、干扰消除效果、方法线性范围、方法检出限和方法准确度进行实验。结果表明:串接氧气模式可以有效消除硫元素的质谱干扰,方法灵敏度高,方法检出限达到1.8μg/g,可对硫元素含量在2%以下样品直接分析,方法经过国家标准物质验证,测定值均在标称值范围之内,可作为农作物样品中硫元素分析新方法使用。

Determination of Sulfur in Crops by Triple Quadrupole Inductively Coupled Plasma Mass Spectrometry

Microwave Digestion-Triple Quadrupole Inductively Coupled Plasma Mass Spectrometry (ICP-MS/MS) was used to determine sulfur in crop samples, and a high sensitivity sulfur detection method in crop samples was provided. The measurement mode, interference elimination effect, linear range, detection limit and accuracy of the method were tested. The results show that the MS/MS oxygen mode can effectively eliminate the mass spectrum interference of sulfur, the method has high sensitivity, the detection limit of the method reaches 1.8 µg/g, and the sample with sulfur content below 2% can be directly analyzed by the method. The method was verified by national standard material, and the measured values were within the range of nominal value. It can be used as a new detection method for sulfur element analysis in crop samples.