ASTM-D7781 Standard Test Method for Nitrite-Nitrate in Water by Nitrate Reductase

ASTM-D7781 - 2023 EDITION - CURRENT
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Standard Test Method for Nitrite-Nitrate in Water by Nitrate Reductase
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Scope

1.1 This test method is applicable to the determination of nitrate plus nitrite (as nitrogen) in drinking water, surface, saline, wastewater, and ground waters. The applicable range of this test method is from 0.05 to 5 mg/L of nitrogen. The range may be extended upward by dilution of an appropriate aliquot. The 40 CFR Part 136 Method Detection Limit (MDL) is 0.02 mg/L.

1.2 It is the user's responsibility to ensure the validity of this test method for waters of untested matrices. The quality control criteria in Section 17 for method blanks, laboratory control samples, matrix spikes and matrix duplicates must be met.

1.3 The values stated in SI units are 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Significance and Use

5.1 This test method replaces Methods D1254 (Nitrite) and D992 (Nitrate). The nitrite test method (Method D1254) used a reagent that is considered to be a potential carcinogen. The nitrate test method (Method D992) has been shown to have relatively large errors when used in wastewaters and also has greater manipulative difficulties than the test method described herein.

5.2 This test method can be used in place of Test Methods D3867 (Nitrite-Nitrate). Test Methods D3867 uses cadmium 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.

Keywords

cadmium reduction; discrete analyzer; enzyme; nitrate; nitrate plus nitrite; nitrate reductase; nitrite;

To find similar documents by ASTM Volume:

11.02 (Water (II))

To find similar documents by classification:

13.060.50 (Examination of water for chemical substances)

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Document Number

ASTM-D7781-23

Revision Level

2023 EDITION

Status

Current

Modification Type

Reinstated

Publication Date

April 18, 2023

Document Type

Test Method

Page Count

7 pages

Committee Number

D19.05