ICP-AES法分析不同品种青稞中的20种元素含量

为探明青海青稞的矿物元素组成，促进青稞资源开发利用及品质评价，采用湿法消解、电感耦合等离子体原子发射光谱法(ICP-AES)对不同品种青稞中的20种元素--Ca、K、Mg、Na、P、S、Ba、Cu、Fe、Li、Mn、Mo、Ni、Sr、Ti、Zn、Al、As、Cr和Pb进行测定，并应用聚类分析方法对测定结果进行分析。结果表明：在选定的条件下，各元素间相互干扰小，对测定结果无明显影响；该方法回收率在95.4%～101.2%之间，RSD值(n=7)在1.2%～5.3%之间，具有较好的准确度与精密度；不同品种青稞样品中各种元素丰富，其中元素K、P、Mg、Ca、Na、S、Fe、Zn、Mn、Al、Cu含量较高，不同品种间有明显差异；聚类分析将15个样品聚为3类，其中蓝青稞与红青稞表现出较强相似性，而白青稞呈现品质的多元性，同时青稞中微量元素的分布差异与品种的差异性有相当大的关联，而地域的差异性表现的不明显。

Determination Contents of Twenty Elements in Different Cultivars of Naked Barley by ICP-AES

The contents of 20 elements in 15 cultivars of naked barley, including calcium, potassium, magnesium, natrium, phosphorus, sulfur, barium, copper, ferrum, lithium, manganece, molybdenum, nickel, strontium, titanium, zinc, aluminum, arsenic, chromium and lead were determined by ICP-AES to conduct a cluster analysis. No significant mutual interference was found among the tested elements. The recovery of the method varied from 95.4% to 101.2%, with a RSD of 1.2% to 5.3% (n = 7) and meanwhile the method showed high accuracy and precision. The 15 naked barley cultivars were all rich in minerals but with a significant difference, and the major ones are K, P, Mg, Ca, Na, S, Fe, Zn, Mn, Al and Cu. In terms of the contents of the 20 elements, these naked barley cultivars were clustered into three groups: green, red and white. Green and red naked barleys resembled each other highly, and white naked barley presented differences in quality. Cluster analysis further showed that trace elements in naked barley were considerably related to cultivars rather than geographic origins.