T/SDAS 4-2016 Determination of Impurity Element Content in High Purity Gold by Glow Discharge Mass Spectrometry

Scope

Scope: This standard specifies the determination method for impurity elements in high-purity gold, and the elements to be determined are listed in Table 1. This standard is applicable to the determination of impurity element contents in high-purity gold, with the measurement range of each element's mass fraction being 0.1 μg/kg to 20,000 μg/kg. Main technical content: The sample is used as a cathode for glow discharge, and its surface atoms are sputtered and removed from the sample into the glow discharge plasma. After ionization in the plasma, the ions are introduced into the mass spectrometer. At the mass number of each element's isotope, the corresponding spectral peaks are integrated with a preset number of scanning points and integration time. The obtained area is the spectral peak intensity. For semi-quantitative analysis, the computer automatically calculates the mass content of each element based on the "typical relative sensitivity factor" in the instrument software; for quantitative analysis, the relative sensitivity factor needs to be obtained by independently measuring a standard sample under the same analysis conditions, ion source structure, and test conditions as the tested sample. The mass content of each element is calculated using this relative sensitivity factor, and the mass fraction of gold is determined by the impurity subtraction method.

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