Dissolved oxygen is required for the survival and growth of many aquatic organisms, including fish. The concentration of dissolved oxygen may also be associated with corrosivity and photosynthetic activity. The absence of oxygen may permit anaerobic decay of organic matter and the production of toxic and undesirable esthetic materials in the water.
1.1 These test methods cover the determination of dissolved oxygen in water. Three test methods are given as follows:
| Range, mg/L | Sections | |
| Test Method A—Titrimetric Procedure– High Level | >1.0 | 8 to 15 |
| Test Method B—Instrumental Probe Procedure— Electrochemical | 0.05 to 20 | 16 to 25 |
| Test Method C—Instrumental Probe Procedure— Luminescence-Based Sensor | 0.05 to 20 | 26 to 29 |
1.2 The precision of Test Methods A and B was carried out using a saturated sample of reagent water. It is the user''s responsibility to ensure the validity of the test methods for waters of untested matrices.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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. For a specific precautionary statement, see Note 17. 8.1 This test method is applicable to waters containing more than 1000 μg/L of dissolved oxygen such as stream and sewage samples. It is the user''s responsibility to ensure the validity of the test method for waters of untested matrices. 8.2 This test method, with the appropriate agent, is usable with a wide variety of interferences. It is a combination of the Winkler Method, the Alsterberg (Azide) Procedure, the Rideal-Stewart (permanganate) modification, and the Pomeroy-Kirshman-Alsterberg modification. 8.3 The precision of the test method was carried out using a saturated sample of reagent water. 16.1 This test method is applicable to waters containing dissolved oxygen in the range from 50 to 20 000 μg/L. It is the user''s responsibility to ensure the validity of this test method for waters of untested matrices. 16.2 This test method describes procedures that utilize electrochemical probes for the determination of dissolved oxygen in fresh water and in brackish and marine waters that may contain dissolved or suspended solids. Samples can be analyzed in situ in bodies of water or in streams, or samples can be collected and analyzed subsequent to collection. The electrochemical probe method is especially useful in the monitoring of water systems in which it is desired to obtain a continuous record of the dissolved oxygen content. 16.2.1 This test method is recommended for measuring dissolved oxygen in waters containing materials t......
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