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See Chinese contents: GB/T 16597-2019 GB/T 16597-2019: Analytical methods of metallurgical products -- General rule for X-ray fluorescence spectrometric methods
This standard specifies the general requirements for quantitative analysis of elements by X-ray fluorescence spectrometry, including terms and definitions, basic principles, instruments, reagents and materials, preparation methods of samples, quantitative analysis, safety precautions, records and expression of measurement results. This standard applies to wavelength dispersive and energy dispersive X-ray fluorescence spectrometers, to measure the element composition and element content in various materials. It can be used for qualitative and quantitative analysis of constant and trace of all elements from 4Be to 92U in the periodic table, in addition to H, He, Li, for wavelength dispersive and energy dispersive X-ray fluorescence spectrometers, which use X-ray tubes as excitation sources. The mass fraction range of the analyzed elements: 0.0001% ~ 100%.
