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2、n American National StandardStandard Test Methods forNitrite-Nitrate in Water1This standard is issued under the fixed designation D 3867; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parent
3、heses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 These test methods cover the determination of nitrite nitrogen, nitrate nitrogen, and combined nitrite-nitrate nitrogen in water and wastewater in th
4、e range from 0.05 to 1.0 mg/L nitrogen. Two test methods2 are given as follows:SectionsTest Method AAutomated Cadmium Reduction9 to 16Test Method BManual Cadmium Reduction17 to 241.2 These test methods are applicable to surface, saline, waste, and ground waters. It is the users responsibility to ens
5、ure the validity of these test methods for waters of untested matrices.1.3 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 appro- priate safety and health practices and determine
6、 the applica- bility of regulatory limitations prior to use. For specific hazard statements, see Note 1 and Note 2.2. Referenced Documents2.1 ASTM Standards:D 992 Test Method for Nitrate Ion in Water3D 1129 Terminology Relating to Water4D 1141 Specification for Substitute Ocean Water5D 1192 Specific
7、ation for Equipment for Sampling Water and Steam in Closed Conduits4D 1193 Specification for Reagent Water4D 1254 Test Method for Nitrite Ion in Water6D 2777 Practice for Determination of Precision and Bias ofApplicable Methods of Committee D-19 on Water4D 3370 Practices for Sampling Water from Clos
8、ed Con- duits41 These test methods are under the jurisdiction of ASTM Committee D-19 on Water and are the responsibility of Subcommittee D19.05 on Inorganic Constituents in Water.Current edition approved June 10, 1999. Published November 1999. Originally published as D 3867 79. Last previous edition
9、 D 3867 90.2 Methods similar to these appear in Methods of Chemical Analysis of Water andWastes, 2nd edition, U.S. Environmental Protection Agency.3 Discontinued; see 1983 Annual Book of ASTM Standards, Vol 11.01.4 Annual Book of ASTM Standards, Vol 11.01.5 Annual Book of ASTM Standards, Vol 11.02.6
10、 Discontinued; see 1980 Annual Book of ASTM Standards, Part 31.E 60 Practices for Photometric and Spectrometric Methodsfor Chemical Analysis of Metals7E 275 Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near Infrared Spectrophotom- eters83. Terminology3.1 Definitions
11、: For definitions of terms used in these test methods, refer to Terminology D 1129.4. Summary of Test Methods4.1 A filtered sample is passed through a column containing copper-coated cadmium granules to reduce nitrate ion to nitrite ion. The combined nitrite-nitrate nitrogen is determined by diazoti
12、zing the total nitrite ion with sulfanilamide and coupling with N-(1-naphthyl)ethylenediamine dihydrochloride to form a highly colored azo dye that is measured spectrophotometri- cally.4.2 The nitrite ion originally present in the sample can be determined separately by carrying out the procedure and
13、 omitting the cadmium reduction step.4.3 The nitrate ion can be calculated as the difference between the combined nitrite-nitrate nitrogen and the nitrite nitrogen.5. Significance and Use5.1 Both test methods use identical reagents and sample processing. The only difference between the two methods i
14、s 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 instru- mentation is not available.5
15、.3 These test methods replace Test Methods D 1254 (Ni- trite) and D 992 (Nitrate). The nitrite test method (Test Method D 1254) used a reagent which is considered to be a potential carcinogen. The nitrate test method (Test Method D 992) has been shown to have relatively large errors when used in7 Annual Book of ASTM Standards, Vol 03.05.8 Annual Book of ASTM Standards, Vol 03.06.*A Summary of Changes section appears at the end of this standard.Copyright ASTM Int
