ASTM D2330-20
(Test Method)Standard Test Method for Methylene Blue Active Substances
Standard Test Method for Methylene Blue Active Substances
SIGNIFICANCE AND USE
5.1 The widespread use and discharge of detergents into surface waters can result in a lowering of its aesthetic quality by foam formation and by causing toxicity to aquatic wildlife. This test method is capable of detecting small concentrations of detergents as MBAS so that they can be controlled to prevent such problems.
5.2 Biodegradable linear alkyl benzene sulfonates (LAS) have replaced the branched-chain alkyl benzene sulfonates (ABS) in detergent formulations, which were more resistant to biodegradation. Differentiation between linear and branched-chain alkyl benzene sulfonates, as well as differentiation of the various positional isomers of either type, is not possible by this test method. While the methylene blue method may be employed to monitor studies designed to measure biodegradability, it cannot be used to predict this quality.
SCOPE
1.1 This test method covers the determination of compounds that react with methylene blue under the conditions specified in the test procedure. They are referred to as methylene blue active substances (MBAS), and are calculated and reported in terms of the reference material, linear alkyl benzene sulfonate, LAS.
1.2 This test method is applicable for determining MBAS in water and wastewater. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.
1.3 This test method is a simple, rapid, control procedure suitable for monitoring the effectiveness of a biodegradation or other linear alkyl benzene sulfonate (LAS) removal process. For greater specificity and interference removal, the pretreatment procedure in Annex A1 should be used. Data derived without the pretreatment procedure should be interpreted with care. This test method is applicable in the range from 0.03 to 1.5 mg/L for a 100-mL sample.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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. For a specific hazard statement, see 8.3.
1.6 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
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: D2330 − 20
Standard Test Method for
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Methylene Blue Active Substances
This standard is issued under the fixed designation D2330; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 This test method covers the determination of com-
D459Terminology Relating to Soaps and Other Detergents
pounds that react with methylene blue under the conditions
D1129Terminology Relating to Water
specified in the test procedure. They are referred to as
D1193Specification for Reagent Water
methylene blue active substances (MBAS), and are calculated
D3370Practices for Sampling Water from Flowing Process
and reported in terms of the reference material, linear alkyl
Streams
benzene sulfonate, LAS.
D3856Guide for Management Systems in Laboratories
1.2 ThistestmethodisapplicablefordeterminingMBASin
Engaged in Analysis of Water
water and wastewater. It is the user’s responsibility to ensure
D4210Practice for Intralaboratory Quality Control Proce-
the validity of this test method for waters of untested matrices.
dures and a Discussion on Reporting Low-Level Data
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(Withdrawn 2002)
1.3 This test method is a simple, rapid, control procedure
D5788Guide for Spiking Organics into Aqueous Samples
suitableformonitoringtheeffectivenessofabiodegradationor
D5789Practice for Writing Quality Control Specifications
other linear alkyl benzene sulfonate (LAS) removal process.
for Standard Test Methods for Organic Constituents
For greater specificity and interference removal, the pretreat-
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(Withdrawn 2002)
ment procedure in Annex A1 should be used. Data derived
D5847Practice for Writing Quality Control Specifications
without the pretreatment procedure should be interpreted with
for Standard Test Methods for Water Analysis
care. This test method is applicable in the range from 0.03 to
E60Practice for Analysis of Metals, Ores, and Related
1.5 mg/L for a 100-mL sample.
Materials by Spectrophotometry
1.4 The values stated in SI units are to be regarded as
E131Terminology Relating to Molecular Spectroscopy
standard. No other units of measurement are included in this
E275PracticeforDescribingandMeasuringPerformanceof
standard.
Ultraviolet and Visible Spectrophotometers
1.5 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1 Definitions:
priate safety, health, and environmental practices and deter- 3.1.1 For definitions of terms used in this standard, refer to
mine the applicability of regulatory limitations prior to use. Terminologies D1129 and E131.
For a specific hazard statement, see 8.3.
3.2 Definitions of Terms Specific to This Standard:
1.6 This international standard was developed in accor-
3.2.1 alkyl benzene sulfonate (ABS), n—the generic name
dance with internationally recognized principles on standard-
applied to the neutralized product resulting from the sulfona-
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ization established in the Decision on Principles for the
tion of a branched-chain alkylated benzene. See also Termi-
Development of International Standards, Guides and Recom-
nology D459.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
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This test method is under the jurisdiction of ASTM Committee D19 on Water the ASTM website.
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andisthedirectresponsibilityofSubcommitteeD19.06onMethodsforAnalysisfor The last approved version of this historical standard is referenced on
Organic Substances in Water. www.astm.org.
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Current edition approved Jan. 1, 2020. Published February 2020. Originally For a more complete discussion of terms relating to synthetic detergents and
approvedin1965.Lastpreviouseditionapprovedin2002asD2330–02whichwas theirsignificance,refertoMcKinney,R.E.,“SyndetsandWasteDisposal,” Sewage
withdrawn January 2011 and reinstated in January 2020. DOI: 10.1520/D2330-20. and Industrial Wastes, Vol 29, Part 6, June 1957, pp. 654–666.
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