微波消解-ICP-MS测定石阡苔茶中17种矿物质元素

Determination of seventeen mineral elements in Shiqian moss tea by microwave digestion-ICP-MS

建立微波消解-电感耦合等离子体质谱（ICP—MS）法测定石阡苔茶中Na、Mg、K、Ca、Cr、Mn、Fe、Co、Cu、Zn、As、Se、Mo、Cd、Sb、H卧Pb等17种矿物质元素。结果表明，17种元素在0～1000n∥mL范围内呈良好的线性关系（R≥0．9990），检出限为O．001-23．720ng／mL，加标回收率为91．63％～104．45％，相对标准偏差（RSD）为1．26％-5．34％，精密度试验结果RSD值为0．002％-8．450％，该方法快速简单、准确、灵敏度高，能满足石阡苔茶中17种矿物质元素的检测需求。石阡苔茶样品中K元素含量最高，其次是Ca元素，必需微量元素含量从大到小顺序为：Fe、Zn、Cu、Cr、Co、Se、Mo。Hg、Pb、Cd、As4种重金属元素含量均符合国家标准和农业部行业标准。

The determination method of 17 mineral elements （such as Na, Mg, K, Ca, Cr, Mn, Fe, Co, Cu, Zn, As, Se, Mo, Cd, Sb, Hg and Pb） in Shiqian moss tea was established by microwave digestion-inductively coupled plasma mass spectrometry （ICP-MS）. The results showed the 17 mineral elements had a good linear relationship in the rage of 0-1 000 ng/ml （R≥0.999 0）. The limit of detection was 0.001-23.720 ng/ml. The adding stan- dard recover rate was 91.63%-104.45% and the relative standard deviation （RSD） was 1.26%-5.34%. The RSD of precision experiments results was 0.002%-8.450%. The method had fast speed, simple operation, good accuracy and high sensitivity, which can meet the determination requirement of 17 kinds of mineral elements in Shiqian moss tea. The K content was the highest in Shiqian moss tea, and the second was Ca. The essential trace elements content from high to low in order was Fe, Zn, Cu, Cr, Co, Se, Mo. And Hg, Pb, Cd as four kinds of heavy metal elements content conformed the national standard and the agriculture industry standards.