ASTM D7573-18ae1

Standard Test Method for Total Carbon and Organic Carbon in Water by High Temperature Catalytic Combustion and Infrared Detection

SIGNIFICANCE AND USE
5.1 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.  
5.2 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.4
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 drinking water, groundwater, surface water, wastewater, and seawater in the range from 0.5 mg/L to 50 mg/L. Concentrations of 50–4000 mg/L of carbon may be determined by automated injection of less sample volume or by sample dilution. Alternatively, use less sample volume and calibrate at higher concentrations..  
1.2 The sample is injected into a tube 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.  
1.3 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:
1.4 For NPOC analysis a portion of sample is acidified and purged to remove IC. The purged sample is then injected to determine NPOC.  
1.5 This test method is applicable to the matrices and concentrations validated in the inter-laboratory study. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices and different concentration ranges.  
1.6 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.  
1.7 In addition to laboratory analyses, this test method may be applied to stream monitoring.  
1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.9 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.  
1.10 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: 14-Dec-2018
• 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

Relations

• Refers: ASTM D6759-16 - Standard Practice for Sampling Liquids Using Grab and Discrete Depth Samplers
• Effective Date: 15-Oct-2016
• Refers: ASTM D4448-01(2019) - Standard Guide for Sampling Ground-Water Monitoring Wells
• Effective Date: 01-Feb-2019
• Refers: ASTM D6538-12(2019) - Standard Guide for Sampling Wastewater With Automatic Samplers
• Effective Date: 01-Sep-2019

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.
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Designation: D7573 − 18a
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—The research report footnote to Section 15 was editorially updated in January 2019.
1. Scope zone. The syringe needle or injector opening size generally
limits the maximum size of particles that can be so introduced.
1.1 This test method covers the determination of total
carbon (TC), inorganic carbon (IC), total organic carbon 1.7 In addition to laboratory analyses, this test method may
(TOC), dissolved organic carbon (DOC), and non-purgable be applied to stream monitoring.
organic carbon (NPOC) in drinking water, groundwater, sur-
1.8 The values stated in SI units are to be regarded as
face water, wastewater, and seawater in the range from 0.5
standard. No other units of measurement are included in this
mg/L to 50 mg/L. Concentrations of 50–4000 mg/L of carbon
standard.
may be determined by automated injection of less sample
1.9 This standard does not purport to address all of the
volume or by sample dilution. Alternatively, use less sample
safety concerns, if any, associated with its use. It is the
volume and calibrate at higher concentrations.
responsibility of the user of this standard to establish appro-
1.2 The sample is injected into a tube heated at≥680ºC.The
priate safety, health, and environmental practices and deter-
sample converts into a gaseous phase and forced through a
mine the applicability of regulatory limitations prior to use.
layer of catalyst ensuring conversion of all carbon containing
1.10 This international standard was developed in accor-
compounds to CO .Anon-dispersive infrared (NDIR) detector
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dance with internationally recognized principles on standard-
measures the resulting CO .
2
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.3 For TOC and DOC analysis a portion of the sample is
mendations issued by the World Trade Organization Technical
injected to determine TC or dissolved carbon (DC). A portion
Barriers to Trade (TBT) Committee.
of the sample is then acidified and purged to remove the IC.
The purged inorganic carbon is measured asTIC, or DIC.TOC
2. Referenced Documents
orDOCiscalculatedbysubtractingtheinorganicfractionfrom
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the total carbon: 2.1 ASTM Standards:
D1129 Terminology Relating to Water
TOC 5 TC 2IC (1)
D1192 Guide for Equipment for Sampling Water and Steam
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1.4 For NPOC analysis a portion of sample is acidified and
in Closed Conduits (Withdrawn 2003)
purged to remove IC. The purged sample is then injected to
D1193 Specification for Reagent Water
determine NPOC.
D2777 Practice for Determination of Precision and Bias of
1.5 This test method is applicable to the matrices and Applicable Test Methods of Committee D19 on Water
D3370 Practices for Sampling Water from Flowing Process
concentrations validated in the inter-laboratory study. It is the
user’s responsibility to ensure the validity of this test method Streams
for waters of untested matrices and different concentration D4448 Guide for Sampling Ground-Water Monitoring Wells
D5847 Practice for Writing Quality Control Specifications
ranges.
for Standard Test Methods for Water Analysis
1.6 This test method is applicable only to carbonaceous
D6538 Guide for Sampling Wastewater With Automatic
matter in the sample that can be introduced into the reaction
Samplers
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This test method is under the jurisdiction of ASTM Committee D19 on Water For referenced ASTM standards, visit the ASTM website, www.astm.org, or
andisthedirectresponsibilityofSubcommitteeD19.06onMethodsforAnalysisfor contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Organic Substances in Water. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 15, 2018. Published January 2019. Originally the ASTM website.
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approved in 2009. Last previous edition approved in 2018 as D7573 – 18. DOI: The last approved version of this historical standard is referenced on
10.1520/D7573-18AE01. www.astm.org.
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