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Significance and Use
5.1 Both test methods use identical reagents and sample processing. The only difference between the two methods is that one test method is automated and the other is manual. The ranges and interferences are identical.
5.2 The automated test method is preferred when large numbers of samples are to be analyzed. The manual test method is used for fewer samples or when automated instrumentation is not available.
5.3 These test methods replace Test Methods (Nitrite) and (Nitrate). The nitrite test method (Test Method ) used a reagent that is considered to be a potential carcinogen. The nitrate test method (Test Method ) has been shown to have relatively large errors when used in wastewaters and also has greater manipulative difficulties than the test method described herein.
5.4 Test Method uses a nitrate reductase enzyme for the reduction of nitrate to nitrite. Cadmium is considered a toxic metal. Also, the heterogeneous cadmium reductant creates greater difficulty than the reduction described in this test method.
1.1 These test methods cover the determination of nitrite nitrogen, nitrate nitrogen, and combined nitrite-nitrate nitrogen in water and wastewater in the range from 0.05 to 1.0 mg/L nitrogen. Two test methods are given as follows:
Test Method A—Automated Cadmium Reduction
Test Method B—Manual Cadmium Reduction
1.2 These test methods are applicable to surface, saline, waste, and ground waters. It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices.
1.3 The values stated in either SI or inch-pound units are to be regarded as the 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 specific hazard statements, see .
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1129 Terminology Relating to Water
D1141 Practice for the Preparation of Substitute Ocean Water
D1193 Specification for Reagent Water
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3370 Practices for Sampling Water from Flowing Process Streams
D5810 Guide for Spiking into Aqueous Samples
D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
D7781 Test Method for Nitrite-Nitrate in Water by Nitrate Reductase
E60 Practice for Analysis of Metals, Ores, and Related Materials by Spectrophotometry
E275 Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers
ICS Number Code 13.060.50 (Examination of water for chemical substances)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D3867-16, Standard Test Methods for Nitrite-Nitrate in Water, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top