ASTM D5744-13e1
(Test Method)Standard Test Method for Laboratory Weathering of Solid Materials Using a Humidity Cell
Standard Test Method for Laboratory Weathering of Solid Materials Using a Humidity Cell
SIGNIFICANCE AND USE
5.1 The laboratory weathering procedure will generate data that can be used to: (1) determine whether a solid material will produce an acidic, alkaline, or neutral effluent, (2) identify solutes in the effluent that represent dissolved weathering products formed during a specified period of time, (3) determine the mass of solute release, and (4) determine the rate at which solutes are released (from the solids into the effluent) under the closely controlled conditions of the test.
5.2 Data generated by the laboratory weathering procedure can be used to address the following objectives: (1) determine the variation of drainage quality as a function of compositional variations (for example, iron sulfide and calcium+magnesium carbonate contents) within individual mine-rock lithologies, (2) determine the amount of acid that can be neutralized by the sample while maintaining drainage pH ≥ 6.0 under the conditions of the test, (3) estimate mine-rock weathering rates to aid in predicting the environmental behavior of mine rock, and (4) determine mine-rock weathering rates to aid in experimental design of site-specific kinetic tests.
5.3 The laboratory-weathering procedure provides conditions conducive to oxidation of solid material constituents and enhances the transport of weathering reaction products contained in the resulting weekly effluent. This is accomplished by controlling the exposure of the solid material sample to such environmental parameters as reaction environment temperature and application rate of water and oxygen.
5.4 Because efficient removal of reaction products is vital to track mineral dissolution rates during the procedure, laboratory leach volumes are large per unit mass of rock to promote the rinsing of weathering-reaction products from the mine-rock sample. A comparison of laboratory kinetic tests with field tests has shown that more reaction products from mineral dissolution are consistently released per unit weight and unit time in labora...
SCOPE
1.1 This kinetic test method covers a laboratory weathering procedure that (1) enhances reaction-product transport in the aqueous leach of a solid material sample of specified mass, and (2) measures rates of weathering-product mass release. Soluble weathering products are mobilized by a fixed-volume aqueous leach that is performed and collected weekly. Leachate samples are analyzed for pH, alkalinity/acidity, specific conductance, sulfate, and other selected analytes.
1.1.1 This test method is intended for use to meet kinetic testing regulatory requirements for mining waste rock and ores sized to pass a 6.3-mm (0.25-in.) Tyler screen.
1.1.2 Interlaboratory testing of this method has been confined to mine waste rock. Application of this test method to metallurgical-processing waste (for example, mill tailings) is outside the scope of the test method.
1.2 This test method is a modification of a laboratory weathering procedure developed originally for mining wastes(1-3).2 However, it may have useful application wherever gaseous oxidation coupled with aqueous leaching are important mechanisms for contaminant mobility.
1.3 This test method calls for the weekly leaching of a well-characterized solid material sample (weighing at least 1000-g), with water of specified purity, and the collection and chemical characterization of the resulting leachate. Test duration is determined by the user’s objectives of the test.
1.4 As described, this test method may not be suitable for some materials containing plastics, polymers, or refined metals. These materials may be resistant to traditional particle size reduction methods.
1.5 Additionally, this test method has not been tested for applicability to organic substances and volatile matter.
1.6 This test method is not intended to provide leachates that are identical to the actual leachate produced from a solid material in the field or to produce leachates to be used as...
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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
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Designation: D5744 − 13
Standard Test Method for
Laboratory Weathering of Solid Materials Using a Humidity
1
Cell
This standard is issued under the fixed designation D5744; 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.
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ε NOTE—Editorially updated Research Report footnote information in Section 13 in December 2013.
1. Scope 1.5 Additionally, this test method has not been tested for
applicability to organic substances and volatile matter.
1.1 This kinetic test method covers a laboratory weathering
1.6 This test method is not intended to provide leachates
procedure that (1) enhances reaction-product transport in the
that are identical to the actual leachate produced from a solid
aqueousleachofasolidmaterialsampleofspecifiedmass,and
material in the field or to produce leachates to be used as the
(2)measuresratesofweathering-productmassrelease.Soluble
sole basis of engineering design.
weathering products are mobilized by a fixed-volume aqueous
leachthatisperformedandcollectedweekly.Leachatesamples
1.7 Thistestmethodisnotintendedtosimulatesite-specific
are analyzed for pH, alkalinity/acidity, specific conductance,
leaching conditions. It has not been demonstrated to simulate
sulfate, and other selected analytes.
actualdisposalsiteleachingconditions.Furthermore,thetestis
1.1.1 This test method is intended for use to meet kinetic not designed to produce effluents that are in chemical equilib-
testingregulatoryrequirementsforminingwasterockandores
rium with the solid phase sample.
sized to pass a 6.3-mm (0.25-in.) Tyler screen.
1.8 This test method is intended to describe the procedure
1.1.2 Interlaboratory testing of this method has been con-
for performing the laboratory weathering of solid materials. It
fined to mine waste rock. Application of this test method to
does not describe all types of sampling and analytical require-
metallurgical-processing waste (for example, mill tailings) is
ments that may be associated with its application.
outside the scope of the test method.
1.9 The values stated in SI units are to be regarded as
1.2 This test method is a modification of a laboratory
standard. No other units of measurement are included in this
weathering procedure developed originally for mining wastes
standard.
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(1-3). However, it may have useful application wherever 1.9.1 Exception—The values given in parentheses are for
gaseousoxidationcoupledwithaqueousleachingareimportant
information only.
mechanisms for contaminant mobility.
1.10 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.3 This test method calls for the weekly leaching of a
responsibility of the user of this standard to establish appro-
well-characterized solid material sample (weighing at least
priate safety and health practices and determine the applica-
1000-g), with water of specified purity, and the collection and
bility of regulatory limitations prior to use.
chemical characterization of the resulting leachate. Test dura-
tion is determined by the user’s objectives of the test.
2. Referenced Documents
1.4 As described, this test method may not be suitable for
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2.1 ASTM Standards:
some materials containing plastics, polymers, or refined met-
D75Practice for Sampling Aggregates
als.These materials may be resistant to traditional particle size
D276Test Methods for Identification of Fibers in Textiles
reduction methods.
D420GuidetoSiteCharacterizationforEngineeringDesign
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and Construction Purposes (Withdrawn 2011)
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This test method is under the jurisdiction ofASTM Committee D34 on Waste
Management and is the direct responsibility of Subcommittee D34.01.04 on Waste
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Leaching Techniques. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2013. Published September 2013. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1996. Last previous edition approved in 2012 as D5744-12. DOI: Standardsvolume information, refer to the standard’s Document Summary page on
10.1520/D5744-13E01. the ASTM website.
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Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof The last approved version of this historical standard is referenced on
this standard. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5744 − 13
D653Terminology Relating to Soil, Rock, and Contained 3.1.6 neutralizing potential, NP, n—capacity of a solid
Fluids materialsampl
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