GB/T 42360-2023 Surface chemical analysis—Total reflection X-ray fluorescence analysis of water

Scope

This document describes the chemical method used by analysts to conduct water sample measurements using total reflection X-ray fluorescence (TXRF) instruments. According to good operating practices, this method has determined accuracy and precision. This document is suitable for conducting routine analyses of a large number of samples and for laboratories operating in accordance with ISO/IEC 17025).
This document describes the method for determining the content of soluble elements in water (e.g., drinking water, surface water, groundwater). Taking into account specific and additional interferences, this method can also be used to determine elements in wastewater and eluates. This document does not include sampling, dilution, and preconcentration methods.
The elements that can be measured by this method vary depending on the X-ray source of the instrument. This document does not address health, safety, and commercial factors.
The measurement range depends on the sample matrix and the interferences encountered. For drinking water and relatively uncontaminated water, the quantification limits of most elements range from 0.001 mg/L to 0.01 mg/L. The measurement range typically ranges from 0.001 mg/L to 10 mg/L, depending on the measured element and the predefined requirements.
Appendix B provides a complete method validation example of TXRF analysis of water samples using a molybdenum target X-ray source and Ga as a calibration internal standard.
The quantification limits of most elements are affected by blank contamination and primarily depend on the laboratory air handling facilities used, as well as the purity of reagents and the cleanliness of experimental equipment.

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