基于ICP-OES对不同产地大白刺果实矿质元素的主成分分析

Determination and principal component analysis of mineral elements based on ICP-OES in Nitraria roborowskii fruits from different regions

采用电感耦合等离子体发射光谱法(ICP-OES)测定内蒙阿拉善盟15个样点大白刺果实中矿质元素含量,并用主成分分析法对其元素含量特征进行了分析。所测19种元素共检出18种,钒(V)未检出,其中钠(Na)、钾(K)和钙(Ca)等元素含量较高,不同样点间Ti含量差异最大,K差异最小。主成分分析得4个主成分,其累计方差贡献率达81.542%,第1主成分的方差贡献率为44.997%,故确定其所对应的铬(Cr)、铁(Fe)、磷(P)、钙(Ca)为大白刺果实的特征元素。所建立的ICP-OES分析方法检出限低,灵敏度高,可适用于大白刺果实矿质元素的测定;主成分分析法清晰地揭示了内蒙阿拉善盟大白刺果实矿质元素含量存在差异和地理分布有关。该研究可为内蒙阿拉善盟大白刺资源的开发提供参考。

The content of elements in fifteen different regions of Nitraria roborowskii samples were determined by inductively cou- pled plasma-atomic emission spectrometry（ ICP-OES）, and its elemental characteristics were analyzed by principal component analysis. The results indicated that 18 mineral elements were detected in N. roborowskii of which V cannot be detected. In addition, contents of Na, K and Ca showed high concentration. Ti showed maximum content variance, while K is minimum. Four principal components were gained from the original data. The cumulative variance contribution rate is 81. 542% and the variance contribution of the first principal component was 44. 997%, indicating that Cr, Fe, P and Ca were the characteristic elements of N. roborowskii. Thus, the established method was simple, precise and can be used for determination of mineral elements in N. roborowskii Kom. fruits. The elemental distri- bution characteristics among N. roborowskii fruits are related to geographical origins which were clearly revealed by PCA. All the results will provide good basis for comprehensive utilization of N. roborowskii.