ASTM D5744-07

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D5744–96 (Reapproved 2001) Designation: D 5744 – 07
Standard Test Method for
AcceleratedLaboratory Weathering of Solid Materials Using
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a Modified Humidity 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1This test method covers a procedure that accelerates the natural weathering rate of a solid material sample so that diagnostic
weathering products can be produced, collected, and quantified. Soluble weathering products are mobilized by a fixed-volume
aqueous leach that is performed, collected, and analyzed weekly.When conducted in accordance with the following protocol, this
laboratory test method has accelerated metal-mine waste-rock weathering rates by at least an order of magnitude greater than
observed field rates
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.
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1.2 This test method is a modification of a laboratory weathering procedure developed originally for mining wastes (1)1-3) .
1.1.1This test method is intended for use to meet kinetic testing regulatory requirements for mining waste and ores.
1.2This test method is a modification of an accelerated weathering test method developed originally for mining wastes (2-4) .
However, it may have useful application wherever gaseous oxidation coupled with aqueous leaching are important mechanisms
for contaminant mobility.
1.3This test method calls for the weekly leaching of a 1000-g solid material sample, with water of a specified purity, and the
collectionandchemicalcharacterizationoftheresultingleachateoveraminimumperiodof20weeks.However,itmayhaveuseful
application wherever gaseous oxidation coupled with aqueous leaching are important mechanisms for contaminant mobility.
1.3 Thistestmethodcallsfortheweeklyleachingofawell-characterizedsolidmaterialsample(weighingatleast1000-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 Asdescribed,thistestmethodmaynotbesuitableforsomematerialscontainingplastics,polymers,orrefinedmetals.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 the sole basis of engineering design.
1.7This1.7 This test method is not intended to simulate site-specific leaching conditions. It has not been demonstrated to
simulate actual disposal site leaching conditions. Furthermore, the test is not designed to produce effluents that are in chemical
equilibrium with the solid phase sample.
1.8 Thistestmethodisintendedtodescribetheprocedureforperformingtheacceleratedlaboratoryweatheringofsolidmaterials
to generate leachates. It does not describe all types of sampling and analytical requirements that may be associated with its
application.
1.9 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
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ThistestmethodisunderthejurisdictionofASTMCommitteeD34onWasteManagementandisthedirectresponsibilityofSubcommitteeD34.01.04onWasteLeaching
Techniques.
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