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See Chinese contents: GB/T 14636-2021 GB/T 14636-2021: Determination of calcium and magnesium in industrial circulating cooling water and scale -- Atomic absorption spectrometric method
This document specifies the determination method of the content of calcium and magnesium in industrial circulating cooling water and the content of calcium and magnesium in the scale of the boiler water system or circulating water system - atomic absorption spectrometry. This document is applicable to the determination of calcium content of 0.5 mg/L~75 mg/L and magnesium content of 0.1 mg/L to 50 mg/L in industrial circulating cooling water; it is applicable to the determination of calcium content ??0.005% and magnesium content ??0.005% in scale.
