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:
|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
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
NO1.3 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
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
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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