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See Chinese contents: GB/T 7729-2021 GB/T 7729-2021: Chemical analysis of metallurgical products -- General rule for spectrophotometric methods
This document specifies the principle, reagents and materials, instruments and equipment, instrument operation methods, preparation of testing samples, measurement and precision of spectrophotometric method that is used for chemical analysis of metallurgical products (hereinafter referred to as the photometric method). This document applies to the application, research and personnel training of the photometric method for chemical analysis of metallurgical products.
