ASTM D7573-09
(Test Method)Standard Test Method for Total Carbon and Organic Carbon in Water by High Temperature Catalytic Combustion and Infrared Detection
Standard Test Method for Total Carbon and Organic Carbon in Water by High Temperature Catalytic Combustion and Infrared Detection
SIGNIFICANCE AND USE
This test method is used for determination of the carbon content of water from a variety of natural, domestic, and industrial sources. In its most common form, this test method is used to measure organic carbon as a means of monitoring organic pollutants in industrial wastewater. These measurements are also used in monitoring waste treatment processes.
The relationship of TOC to other water quality parameters such as chemical oxygen demand (COD) and total oxygen demand (TOD) is described in the literature.
SCOPE
1.1 This test method covers the determination of total carbon (TC), inorganic carbon (IC), total organic carbon (TOC), dissolved organic carbon (DOC), and non-purgable organic carbon (NPOC) in water, wastewater, and seawater in the range from 0.5 mg/L to 4000 mg/L of carbon. Higher levels may be determined by sample dilution. The sample is injected onto a quartz bed heated at 680ºC. The sample converts into a gaseous phase and forced through a layer of catalyst ensuring conversion of all carbon containing compounds to CO2. A non-dispersive infrared (NDIR) detector measures the resulting CO2.
1.2 For TOC and DOC analysis a portion of the sample is injected to determine TC or dissolved carbon (DC). A portion of the sample is then acidified and purged to remove the IC. The purged inorganic carbon is measured as TIC, or DIC. TOC or DOC is calculated by subtracting the inorganic fraction from the total carbon. TOC = TC – IC.
1.3 For NPOC analysis a portion of sample is acidified and purged to remove IC. The purged sample is then injected to determine NPOC.
1.4 This test method was used successfully with reagent water spiked with potassium hydrogen phthalate, sucrose, nicotinic acid, benzoquinone, sodium dodecyl benzene sulfonate, urea, acetic acid, and humic acid. 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 carbonaceous 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.
1.6 In addition to laboratory analyses, this test method may be applied to stream monitoring.
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.
General Information
Relations
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: D7573 − 09
Standard Test Method for
Total Carbon and Organic Carbon in Water by High
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Temperature Catalytic Combustion and Infrared Detection
This standard is issued under the fixed designation D7573; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.7 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
1.1 This test method covers the determination of total
standard.
carbon (TC), inorganic carbon (IC), total organic carbon
1.8 This standard does not purport to address all of the
(TOC), dissolved organic carbon (DOC), and non-purgable
safety concerns, if any, associated with its use. It is the
organic carbon (NPOC) in water, wastewater, and seawater in
responsibility of the user of this standard to establish appro-
therangefrom0.5mg/Lto4000mg/Lofcarbon.Higherlevels
priate safety and health practices and determine the applica-
may be determined by sample dilution. The sample is injected
bility of regulatory limitations prior to use.
onto a quartz bed heated at 680ºC. The sample converts into a
gaseous phase and forced through a layer of catalyst ensuring
2. Referenced Documents
conversion of all carbon containing compounds to CO.A
2
2
2.1 ASTM Standards:
non-dispersiveinfrared(NDIR)detectormeasurestheresulting
D1129Terminology Relating to Water
CO .
2
D1192Guide for Equipment for Sampling Water and Steam
3
1.2 For TOC and DOC analysis a portion of the sample is
in Closed Conduits (Withdrawn 2003)
injected to determine TC or dissolved carbon (DC).Aportion
D1193Specification for Reagent Water
of the sample is then acidified and purged to remove the IC.
D2777Practice for Determination of Precision and Bias of
ThepurgedinorganiccarbonismeasuredasTIC,orDIC.TOC
Applicable Test Methods of Committee D19 on Water
orDOCiscalculatedbysubtractingtheinorganicfractionfrom
D3370Practices for Sampling Water from Closed Conduits
the total carbon. TOC = TC – IC.
D4129Test Method for Total and Organic Carbon in Water
by High Temperature Oxidation and by Coulometric
1.3 For NPOC analysis a portion of sample is acidified and
Detection
purged to remove IC. The purged sample is then injected to
D5847Practice for Writing Quality Control Specifications
determine NPOC.
for Standard Test Methods for Water Analysis
1.4 This test method was used successfully with reagent
3. Terminology
water spiked with potassium hydrogen phthalate, sucrose,
nicotinic acid, benzoquinone, sodium dodecyl benzene
3.1 Definitions—For definitions of terms used in this test
sulfonate, urea, acetic acid, and humic acid. It is the user’s
method, refer to Terminology D1129.
responsibility to ensure the validity of this test method for
3.2 Definitions of Terms Specific to This Standard:
waters of untested matrices.
3.2.1 inorganic carbon (IC), n—carbon in the form of
1.5 This test method is applicable only to carbonaceous carbon dioxide, carbonate ion, or bicarbonate ion.
matter in the sample that can be introduced into the reaction
3.2.2 total organic carbon (TOC), n—carbon in the form of
zone. The syringe needle or injector opening size generally
organic compounds.
limitsthemaximumsizeofparticlesthatcanbesointroduced.
3.2.3 non-purgable organic carbon (NPOC), n—carbon
1.6 In addition to laboratory analyses, this test method may measured in a sample after acidification and sparging to
be applied to stream monitoring. remove inorganic carbon.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction ofASTM Committee D19 on Water contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
andisthedirectresponsibilityofSubcommitteeD19.06onMethodsforAnalysisfor Standards volume information, refer to the standard’s Document Summary page on
Organic Substances in Water. the ASTM website.
3
Current edition approved Oct. 1, 2009. Published November 2009. DOI: The last approved version of this historical standard is referenced on
10.1520/D7573-09. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7573 − 09
3.2.4 total carbon (TC), n—the sum of IC and TOC. 5.2 The relationship of TOC to other water quality param-
eterssuchaschemicaloxygendemand(COD)andtotaloxygen
3.2.5 dissolved organic carbon (DOC), n—carbon deter-
4
demand (TOD) is described in the literature.
mined on filtered samples.
3.2.6 purgable organic carbon (POC), n—carbon that 6. Interferences and Limitations
purges from
...
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