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เอกสารมาตรฐาน
สหรัฐอเมริกา
ASTM
D5543-21
Standard Test Method for Low-Level Dissolved Oxygen in Water
2021
6
ASTM Vol.11.01 (2023)
This test method covers the rapid determination of low-level (<100 μg/L) dissolved oxygen in thermal-cycle steam condensate, deaerated boiler feedwater, boiler water, and deaerated deionized water. Color comparators allow the estimation of concentrations ranging from 0 to 100 μg/L (ppb) oxygen. This test method may be applicable to electronic-grade, pharmaceutical-grade, and other high-purity waters, although these were not addressed in the collaborative study...