ASTM_D_1627_-_94_2000.pdf

Designation:D 1627 94(Reapproved 2000)Standard Test Methods forChemical Analysis of Acid Copper Chromate1This standard is issued under the fixed designation D 1627;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover the chemical analysis of solidacid copper chromate and solutions of this material.1.1.1 Test Method D 38 covers the sampling of woodpreservatives prior to testing.1.2 The analytical procedures appear in the following order:SectionsCopper(calculated as CuO)7 to 10Hexavalent chromium(calculated as CrO3)11 to 13pH of solution141.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 38 Test Methods for Sampling Wood Preservatives Priorto Testing2D 1003 Test Method for Haze and Luminous Transmittanceof Transparent Plastics3D 1035 Test Methods for Chemical Analysis of Fluor-Chrome-Arsenate-Phenol2D 1193 Specification for Reagent Water4D 1326 Methods for Chemical Analysis of AmmoniacalCopper Arsenate2D 1624 Specification for Acid Copper Chromate2D 1628 Test Methods for Chemical Analysis of ChromatedCopper Arsenate2E 70 Test Method for pH of Aqueous Solutions with theGlass Electrode52.2Other Standard:AWPA A2 Standard Methods for Analysis of WaterbornePreservatives and Fire-Retardant Formulations63.Summary of Test Methods3.1 CopperA measured sample is reacted with Hydro-chloric Acid and Potassium Iodide to complex the copper ion.The solution is then titrated with a standard solution of SodiumThiosulfate.The Copper is calculated as CuO.3.2 ChromiumA diluted and chemically treated sample isreacted with an excess of Ferrous Ammonium Sulfate.Theunreacted Ferrous Ammonium Sulfate is titrated with a stan-dard solution of Potassium Dichromate to determine theconsumed chromium.Hexavalent Chromium is calculated asCrO3.3.3 pHThe solution is measured for pH with a glasselectrode.4.Significance and Use4.1 Acid copper chromate for use in the preservative treat-ment of wood must conform with Specification D 1624.5.Purity of Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.7Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Specification D 1193.6.Sampling6.1 When the material to be sampled is a water solution,itshall be mixed to ensure uniformity and the sample shall be at1These test methods are under the jurisdiction of ASTM Committee D-7 onWood and are the direct responsibility of Subcommittee D07.06 on Treatments forWood Products.Current edition approved July 15,1994.Published September 1994.Originallypublished as D 1627 59.Last previous edition D 1627 87.The analytical methods and sampling procedures are substantially the same asthose given in the American Wood-Preservers Association Standard Methods forAnalysis of Water-Borne Preservatives and Fire-Retardant Formulations(A2 84).Acknowledgment is made to the American Wood-Preservers Association for itsdevelopment of the subject matter covered in this standard.2Annual Book of ASTM Standards,Vol 04.10.3Annual Book of ASTM Standards,Vol 08.01.4Annual Book of ASTM Standards,Vol 11.01.5Annual Book of ASTM Standards,Vol 15.05.6Available from American Wood-Preservers Assn.,P.O.Box 286,Woodstock,MD 21163-0286.7“Reagent Chemicals,American Chemical Society Specifications,”Am.Chemi-cal Soc.,Washington,DC.For suggestions on the testing of reagents not listed bythe American Chemical Society,see“Analar Standards for Laboratory U.K.Chemicals,”BDH Ltd.,Poole,Dorset,and the“United States Pharmacopeia.”1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.least a pint and preferably a quart.The sample shall berepresentative and taken by a“thief”or other device.Thesample shall be collected and stored in properly closedcontainers of glass or other suitable material.6.2 When the material to be sampled consists of solids,asample at least 5 lb(2.3 kg)in weight shall be taken fromvarious points in the container or containers so that a repre-sentative sample is obtained.It shall be kept in an airtightcontainer to prevent chan