ASTM-D7781:2023 Edition

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D7781-23 Standard Test Method for Nitrite-Nitrate in Water by Nitrate Reductase

Published By	Publication Date	Number of Pages
ASTM	2023	7

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Categories: 13.060.50 - Examination of water for chemical substances, ASTM

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Description

ASTM D7781-23

Active Standard: Standard Test Method for Nitrite-Nitrate in Water by Nitrate Reductase

ASTM D7781

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.

Keywords

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

ICS Code

ICS Number Code 13.060.50 (Examination of water for chemical substances)

DOI: 10.1520/D7781-23

Additional information

Standard Title	D7781-23 Standard Test Method for Nitrite-Nitrate in Water by Nitrate Reductase
Published Code	ASTM
Publication Date	2023
Pages Count	7
ICS Codes	13.060.50 - Examination of water for chemical substances