GB/T 8151.22-2020 in English

Interpretation of the core content of the standard

As the 22nd part of the GB/T 8151 series of standards, this part innovatively introduces the wavelength dispersive X-ray fluorescence spectrometer technology to achieve the simultaneous determination of 7 major and minor elements in zinc sulfide concentrate. Methods A ternary mixed oxidant (sodium nitrate-potassium nitrate-lithium nitrate) oxidation system was used to prepare glass samples by melting at 1050℃, and the element content was determined by the characteristic X-ray intensity.

Comparison of technical characteristics

Key Operation Points

Implementation recommendations

1. The laboratory should regularly verify the wear of the platinum-gold crucible. It is recommended to check the wall thickness after every 200 melts.
2. For light elements such as Ca and Mg, XS-55 crystal and flow counter (FC) are required to improve the detection sensitivity.
3. Establish a quality control chart to monitor the |wc-Ac| value of the reference material (CRM). The critical value C is calculated according to the formula √(0.3R²+ucRM²).

Standard evolution analysis

Compared with the 2009 version of the series of standards, this part introduces XRF technology into the zinc concentrate detection system for the first time, which complements ICP-AES (Part 20). The technological breakthroughs are:

• The lower limit of determination is extended to 0.10% (Al)~0.15% (Pb)
• A step temperature melting program (700℃→1050℃) is introduced to ensure complete oxidation of sulfides
• New reproducibility data (such as R=0.57% @35.58% for Zn)