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Scope

1.1 This test method covers the determination of low-level (<100μ g/L) dissolved oxygen in thermal-cycle steam condensate, deaerated boiler feedwater, boiler water, and deaerated deionized water. The following test method is included:

1.2 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.

1.3 This test method is a colorimetric procedure applicable to dissolved oxygen in water in the range from 0 to 100 μg/L.

1.4 It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices.

1.5 The values stated in SI units are to be regarded as the standard.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

8.1 This test method covers the rapid, routine determination of dissolved oxygen in steam condensate, deaerated boiler feedwater, and deaerated deionized water. Color comparators allow the estimation of concentrations ranging from 0 to 100 μg/L (ppb) oxygen.

8.2 This test method was tested in steam condensate, deaerated boiler feedwater, and deaerated deionized water. It is the user's responsibility to ensure the validity of the test method for waters of untested matrices.

Significance and Use

Dissolved oxygen is detrimental in certain boiler and steam cycles because it may accelerate corrosion. Concentrations above 10 μg/L are unacceptable in many high-pressure boiler systems. The efficiency of dissolved oxygen removal from boiler feedwater by chemical or mechanical means, or both, is determined by measuring the concentration before and after the process. The measurement is also made to check for air leakage into the boiler system.

The oxygen treatment method for boiler corrosion reduction requires injection of oxygen into the boiler feedwater. The resulting oxygen level is monitored for control purposes.

Keywords

Ampoules; Bichromatic instrument; Boiler feedwater; Color comparator method; Colorimetric analysis--water; Dissolved oxygen (DO); Glass ampoules; Instrumental measurement--water; Rhodazine D; Steam; Steam condensate; Total oxygen demand (TOD); ICS Number Code 13.060.50 (Examination of water for chemical substances)

To find similar documents by ASTM Volume:

11.01 (Water (I))

To find similar documents by classification:

13.060.50 (Examination of water for chemical substances)

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