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Standard Test Method for Nitrite-Nitrate in Water by Nitrate ReductasePřeložit název
NORMA vydána dne 1.4.2023
Označení normy: ASTM D7781-23
Datum vydání normy: 1.4.2023
Kód zboží: NS-1140819
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
cadmium reduction, discrete analyzer, enzyme, nitrate, nitrate plus nitrite, nitrate reductase, nitrite,
|Significance and Use|
5.1?This test method replaces Methods (Nitrite) and (Nitrate). The nitrite test method (Method ) used a reagent that is considered to be a potential carcinogen. The nitrate test method (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.
5.2?This test method can be used in place of Test Methods (Nitrite-Nitrate). Test Methods 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.
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 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.
|2. Referenced Documents|
Poslední aktualizace: 08.12.2023 (Počet položek: 2 860 157)
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