ASTM_D_919_-_97_2002.pdf

Designation:D 919 97(Reapproved 2002)Technical Association of Pulp and Paper IndustryStandard Method T 430m-52An American National StandardStandard Test Method forCopper Number of Paper and Paperboard1This standard is issued under the fixed designation D 919;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 This test method(1,2,3,and 4)2covers the determi-nation of the copper number of bleached and purified paper andpaperboard,except those containing calcium sulfite,zincsulfide,melamine resin,urea-formaldehyde resin,starch,rosinsize,or other copper-reducing nonfibrous materials.Papercontaining such additives can be tested only if the amount andreducing power of the added material is known.1.2 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 585 Practice for Sampling and Accepting a Single Lot ofPaper,Paperboard,Fiberboard,or Related Products3D 586 Test Method for Ash in Pulp,Paper,and PaperProducts3D 644 Test Method for Moisture Content of Paper andPaperboard by Oven Drying3D 687 Method for Quantitative Determination of Coatingon Mineral Coated Paper4D 1968 Terminology Relating to Paper and Paper Products33.Terminology3.1 Definition:Definitions shall be in accordance withTerminology D 1968 and the Dictionary of Paper.54.Significance and Use4.1 The copper number can be regarded as an index of thoseimpurities in cellulose such as oxycellulose,hydrocellulose,lignin,and sugars which possess reducing properties.It isvaluable for detecting changes accompanying deterioration andmay,therefore,be considered as a test for indicating thepermanence of paper.In parchment and grease-proof papers,copper number is considered to give an indication of the degreeof parchmentizing.5.Apparatus5.1 GrinderAgrinder that will completely disintegrate thepaper without heating or contaminating it.The grinder shall bea Koerner type or its equivalent.After disintegrating,thesample should have an absorbent cotton-like appearance.5.2 BathAsteam or oil bath that can be maintained at 1006 1C.6.Reagents6.1 Carbonate-Bicarbonate SolutionDissolve 350 g ofsodium carbonate decchydrate(Na2CO310H2O)(or 129 g ofanhydrous Na2CO3)and 50 g of sodium bicarbonate(NaHCO3)in water and dilute to 1 L.6.2 Copper Sulfate SolutionDissolve 100 g of coppersulfate(CuSO45H2O)in water and dilute to 1 L.6.3 Molybdophosphoric AcidDissolve 100 g of sodiummolybdate(Na2MoO22H2O)and 75 mL of phosphoric acid(H3PO4,83%)in a mixture of 275 mLof sulfuric acid(H2SO4,sp gr 1.84)and 1.75 L of water.6.4 Potassium Permanganate Standard Solution(0.05 N)Dissolve 1.5815 g of potassium permanganate(KMnO4)inwater and dilute to 1 L in a volumetric flask.Standardizeagainst sodium oxalate as the primary standard.6.5 Sodium Carbonate Solution(50 g/L)Dissolve 50 g ofNa2CO3in water and dilute to 1 L.6.6 Sulfuric Acid(sp gr 1.84)Concentrated sulfuric acid(sp gr 1.84).7.Sampling7.1 Sample the material in accordance with Practice D 585.8.Test Specimens8.1 Cut two or more thoroughly representative test speci-mens from each test unit of the sample.Disintegrate eachspecimen in the grinder.For mineral coated samples,removethe coating as described in Method D 687,and air-dry thedecoated paper before disintegrating.In the absence of knowl-edge regarding the respective nonfibrous materials present,1This test method is under the jurisdiction of ASTM Committee D06 on Paperand Paper Products and is the direct responsibility of Subcommittee D06.92 on TestMethods.Current edition approved Dec.10,1997.Published November 1998.Originallypublished as D 919 47 T.Last previous edition D 919 92a(1996).2The boldface numbers in parentheses refer to a list of references at the end ofthis test method.3Annual Book of ASTM Standards,Vol 15.09.4Discontinued,see 1971 Annual Book of ASTM Standards,Part 15.5Available from the Technical Association of the Pulp and Paper Industry,P.O.Box 105113,Atlanta,GA 30348.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.qualitative tests for sizing(rosin,starch,glue,and casein),saturants(waxes,organic saturants,etc.),mineral fillers(espe-cially calcium sulfite and zinc sulfide),and any other suspectednonfibrous materials shall be made before weighing out por-tions of the specimen for test.9.Procedure9.1 Allow the ground specimens to come to moistureequilibrium with the atmosphere of the balance and weigh aportion of 1.5 g to the nearest 0.01 g.Weigh,at the same time,specimens for moisture and ash determinatio