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 0.2–10 mg/L N. Concentrations from 10–500 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 ≥720ºC. 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 and health practices and determine the applicability of regulatory limitations prior to use.

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Publication Date
30-Nov-2016
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ASTM D8083-16 - Standard Test Method for Total Nitrogen, and Total Kjeldahl Nitrogen (TKN) by Calculation, in Water by High Temperature Catalytic Combustion and Chemiluminescence Detection
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D8083 − 16
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 1.6 This test method is performance based. You may make
modifications that improve the test method’s performance but
1.1 This test method covers the determination of total
do not change the oxidation or detection technique.
nitrogen (TN) and total dissolved nitrogen (TDN) in surface
water, seawater, groundwater, wastewater, and wastewater 1.7 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
effluents in the range from 0.2–10 mg/L N. Concentrations
from 10–500 mg/L are possible when used in conjunction with standard.
manual or automatic dilution, or automatic injection of less
1.8 This standard does not purport to address all of the
sample volume. The EPA 40 CFR Part 136 Appendix B
safety concerns, if any, associated with its use. It is the
Method Detection Limit (MDL) is 0.05 mg/L N. Higher
responsibility of the user of this standard to establish appro-
concentrations may be determined by sample dilution. Lower
priate safety and health practices and determine the applica-
concentrations may be possible by injecting larger sample
bility of regulatory limitations prior to use.
volumes. Follow the manufacturer’s instructions.
2. Referenced Documents
1.2 The sample is injected onto a platinum catalyst heated at
2
2.1 ASTM Standards:
≥720ºC. The sample converts into a gaseous phase and is
D1129 Terminology Relating to Water
forced through a layer of catalyst ensuring conversion of all
D1193 Specification for Reagent Water
nitrogen containing compounds to nitrogen oxide (NO). Reac-
D1426 Test Methods for Ammonia Nitrogen In Water
tion with ozone converts the NO to an exited NO . As the
2
D2777 Practice for Determination of Precision and Bias of
excited NO returns to the ground state, it emits radiation that
2
Applicable Test Methods of Committee D19 on Water
is measured photo-electrically.
D3370 Practices for Sampling Water from Closed Conduits
1.3 Total and dissolved organic carbon analysis by Test
D3590 Test Methods for Total Kjeldahl Nitrogen in Water
Method D7573 can be analyzed at the same time on the same
D3867 Test Methods for Nitrite-Nitrate in Water
sample simultaneously using a properly equipped analyzer.
D4327 Test Method for Anions in Water by Suppressed Ion
(See Appendix X1 for an example of simultaneous TOC data.)
Chromatography
1.4 This test method quantitatively recovers nitrogen from a
D4448 Guide for Sampling Ground-Water Monitoring Wells
large range of organic and inorganic nitrogen compounds (see
D5847 Practice for Writing Quality Control Specifications
Table 1 and Table 2). The test method does not measure
for Standard Test Methods for Water Analysis
nitrogen gas (N ). It is the user’s responsibility to ensure the
D6089 Guide for Documenting a Groundwater Sampling
2
validity of this test method for waters of untested matrices.
Event
D6538 Guide for Sampling Wastewater With Automatic
1.5 This test method is applicable only to nitrogenous
Samplers
matter in the sample that can be introduced into the reaction
D6759 Practice for Sampling Liquids Using Grab and Dis-
zone. The syringe needle or injector opening size generally
crete Depth Samplers
limits the maximum size of particles that can be so introduced.
D6919 Test Method for Determination of Dissolved Alkali
Optional automatic sample homogenization may be used.
and Alkaline Earth Cations and Ammonium in Water and
Wastewater by Ion Chromatography
1
This test method is under the jurisdiction of ASTM Committee D19 on Water
2
and is the direct responsibility of Subcommittee D19.06 on Methods for Analysis for For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Organic Substances in Water. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Dec. 1, 2016. Published February 2017. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
D8083-16. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D8083 − 16
TABLE 1 Nitrogen Recoveries from Various Compounds in
3.2.7 total Kjeldahl nitrogen (TKN), n—the sum of nitrogen
Presence
...

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