ASTM D8083-16(2023)

Standard Test Method for Total Nitrogen, and Total Kjeldahl Nitrogen (TKN) by Calculation, in Water by High Temperature Catalytic Combustion and Chemiluminescence Detection

SIGNIFICANCE AND USE
5.1 This test method is used for determination of the total or dissolved nitrogen content of water from a variety of natural, domestic, and industrial sources. In its most common form, this test method is used to measure nitrogen as a means of monitoring nutrient pollutant in industrial wastewater, domestic wastewater, and ambient water. These measurements may also be used in monitoring waste treatment processes.  
5.2 This test method measures oxidized ammonia and organic nitrogen (as nitrate) and soluble nitrate simultaneously, subtracting the nitrate + nitrite value from a non-digested sample gives total Kjeldhal nitrogen (TKN).
When using this test method:
     where:  
  TN  =  total nitrogen, and    TKN  =  total Kjeldahl nitrogen.
SCOPE
1.1 This test method covers the determination of total nitrogen (TN) and total dissolved nitrogen (TDN) in surface water, seawater, groundwater, wastewater, and wastewater effluents in the range from 0.2 mg/L N to 10 mg/L N. Concentrations from 10 mg/L to 500 mg/L are possible when used in conjunction with manual or automatic dilution, or automatic injection of less sample volume. The EPA 40 CFR Part 136 Appendix B Method Detection Limit (MDL) is 0.05 mg/L N. Higher concentrations may be determined by sample dilution. Lower concentrations may be possible by injecting larger sample volumes. Follow the manufacturer’s instructions.  
1.2 The sample is injected onto a platinum catalyst heated at ≥720 °C. The sample converts into a gaseous phase and is forced through a layer of catalyst ensuring conversion of all nitrogen containing compounds to nitrogen oxide (NO). Reaction with ozone converts the NO to an exited NO2. As the excited NO2 returns to the ground state, it emits radiation that is measured photo-electrically.  
1.3 Total and dissolved organic carbon analysis by Test Method D7573 can be analyzed at the same time on the same sample simultaneously using a properly equipped analyzer. (See Appendix X1 for an example of simultaneous TOC data.)  
1.4 This test method quantitatively recovers nitrogen from a large range of organic and inorganic nitrogen compounds (see Table 1 and Table 2). The test method does not measure nitrogen gas (N2). It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.    
1.5 This test method is applicable only to nitrogenous matter in the sample that can be introduced into the reaction zone. The syringe needle or injector opening size generally limits the maximum size of particles that can be so introduced. Optional automatic sample homogenization may be used.  
1.6 This test method is performance based. You may make modifications that improve the test method’s performance but do not change the oxidation or detection technique.  
1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.8 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.  
1.9 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.

General Information

• Status: Published
• Publication Date: 31-Dec-2022
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: D19 - Water
• Drafting Committee: D19.06 - Methods for Analysis for Organic Substances in Water

Standards Content (Sample)

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.
Designation: D8083 − 16 (Reapproved 2023)
Standard Test Method for
Total Nitrogen, and Total Kjeldahl Nitrogen (TKN) by
Calculation, in Water by High Temperature Catalytic
1
Combustion and Chemiluminescence Detection
This standard is issued under the fixed designation D8083; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope limits the maximum size of particles that can be so introduced.
Optional automatic sample homogenization may be used.
1.1 This test method covers the determination of total
1.6 This test method is performance based. You may make
nitrogen (TN) and total dissolved nitrogen (TDN) in surface
modifications that improve the test method’s performance but
water, seawater, groundwater, wastewater, and wastewater
do not change the oxidation or detection technique.
effluents in the range from 0.2 mg ⁄L N to 10 mg ⁄L N.
Concentrations from 10 mg ⁄L to 500 mg ⁄L are possible when
1.7 The values stated in SI units are to be regarded as
used in conjunction with manual or automatic dilution, or
standard. No other units of measurement are included in this
automatic injection of less sample volume. The EPA 40 CFR
standard.
Part 136 Appendix B Method Detection Limit (MDL) is
1.8 This standard does not purport to address all of the
0.05 mg ⁄L N. Higher concentrations may be determined by
safety concerns, if any, associated with its use. It is the
sample dilution. Lower concentrations may be possible by
responsibility of the user of this standard to establish appro-
injecting larger sample volumes. Follow the manufacturer’s
priate safety, health, and environmental practices and deter-
instructions.
mine the applicability of regulatory limitations prior to use.
1.2 The sample is injected onto a platinum catalyst heated at
1.9 This international standard was developed in accor-
≥720 °C. The sample converts into a gaseous phase and is
dance with internationally recognized principles on standard-
forced through a layer of catalyst ensuring conversion of all
ization established in the Decision on Principles for the
nitrogen containing compounds to nitrogen oxide (NO). Reac-
Development of International Standards, Guides and Recom-
tion with ozone converts the NO to an exited NO . As the
mendations issued by the World Trade Organization Technical
2
excited NO returns to the ground state, it emits radiation that Barriers to Trade (TBT) Committee.
2
is measured photo-electrically.
2. Referenced Documents
1.3 Total and dissolved organic carbon analysis by Test
2
2.1 ASTM Standards:
Method D7573 can be analyzed at the same time on the same
D1129 Terminology Relating to Water
sample simultaneously using a properly equipped analyzer.
D1193 Specification for Reagent Water
(See Appendix X1 for an example of simultaneous TOC data.)
D1426 Test Methods for Ammonia Nitrogen In Water
1.4 This test method quantitatively recovers nitrogen from a
D2777 Practice for Determination of Precision and Bias of
large range of organic and inorganic nitrogen compounds (see
Applicable Test Methods of Committee D19 on Water
Table 1 and Table 2). The test method does not measure
D3370 Practices for Sampling Water from Flowing Process
nitrogen gas (N ). It is the user’s responsibility to ensure the
2
Streams
validity of this test method for waters of untested matrices.
D3590 Test Methods for Total Kjeldahl Nitrogen in Water
1.5 This test method is applicable only to nitrogenous D3867 Test Methods for Nitrite-Nitrate in Water
matter in the sample that can be introduced into the reaction D4327 Test Method for Anions in Water by Suppressed Ion
zone. The syringe needle or injector opening size generally Chromatography
D4448 Guide for Sampling Ground-Water Monitoring Wells
D5847 Practice for Writing Quality Control Specifications
1
This test method is under the jurisdiction of ASTM Committee D19 on Water
and is the direct responsibility of Subcommittee D19.06 on Methods for Analysis for
2
Organic Substances in Water. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Jan. 1, 2023. Published February 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2016. Last previous edition approved in 2016 as D8083 – 16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D8083-16R23. the ASTM website.
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