Correlation matrix and cluster analysis showed that the trace and major elements, trace and trace elements in coal are closely related.
相关矩阵及聚类分析表明，煤炭中微量元素与基质元素之间、微量元素之间有着密切的依存性。
XRF is widely used to analy major elements and trace elements in geological rocks, minerals, soils, plants, sediments, metallurgy, mining industry, steel, chemical products, etc.
XRF应用广泛，可用于岩石、矿物、土壤、植物、沉积物、冶金、矿业、钢铁、化工产品等样品中常量和痕量的定量分析。
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