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See Chinese contents: GB/T 12157-2022 GB/T 12157-2022: Determination of dissolved oxygen in water for industrial circulating cooling system and boiler
This document describes the method for the determination of dissolved oxygen in industrial circulating cooling water, boiler feed water, and condensate water. The iodometric method in this document is suitable for the determination of the mass concentration of dissolved oxygen in industrial circulating cooling water ranging from 0.2mg/L to 8mg/L (as O2). The internal electrolysis method is suitable for the determination of the mass concentration of dissolved oxygen in boiler feed water and condensate water from 2μg/L to 100μg/L (as O2). The oxygen electrode method is suitable for the determination of the mass concentration of dissolved oxygen in industrial circulating cooling water and boiler water greater than 0.1μg/L (as O2).
