ASTM_E_1452_-_92_1996.pdf

Designation:E 1452 92(Reapproved 1996)Standard Practice forPreparation of Calibration Solutions for Spectrophotometricand for Spectroscopic Atomic Analysis1This standard is issued under the fixed designation E 1452;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 practice covers the preparation,labeling,and stor-age of calibration solutions employed for calibrating atomicand molecular spectroscopic equipment used for the analysis ofmetals and alloys.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.For specific hazardsinformation,see Section 5.2.Referenced Documents2.1 ASTM Standards:2D 1193 Specification for Reagent WaterE 50 Practices for Apparatus,Reagents,and Safety Precau-tions for Chemical Analysis of MetalsE 288 Specification for Laboratory Glass Volumetric FlasksE 319 Practice for the Evaluation of Single-Pan MechanicalBalancesE 969 Specification for Volumetric(Transfer)Pipets2.2 National Institute for Standards and Technology(NIST)Documents:Circular 602 Testing of Glass Volumetric Apparatus33.Significance and Use3.1 Analytical instrumentation is employed extensivelythroughout industry for quality control,research,and develop-ment purposes.Calibration solutions are required for calibrat-ing certain types of analytical atomic and molecular spectro-scopic instruments.Therefore,the quality of the analyticalresults obtained is directly dependent on the accuracy of thecalibration solutions.3.2 It is assumed that the users of this practice will betrained analysts capable of performing common laboratoryprocedures skillfully and safely.It is expected that the workwill be performed in a properly equipped laboratory.4.Reagents4.1 Purity of ReagentsAll reagents shall conform to thespecifications of the Committee on Analytical Reagents of theAmerican Chemical Society,when such specifications areavailable.4Other grades may be used if it is first ascertainedthat the reagent is of sufficient purity to permit its use withoutlessening the accuracy or stability of the calibration solutionsproduced.See Practices E 50.4.2 Purity of WaterUnless otherwise indicated,all waterused shall be Type II(distilled water)or water of equivalentpurity,in accordance with Specification D 1193.5.Hazards5.1 All safety precautions referenced in Practice E 50 shallbe observed.Generally accepted prudent laboratory practicesshall be followed.5.2 Calibration solutions may be subject to several federal,state,and local laws and regulations,and may be subject to theregulations of some fire departments.5.3 Other laws or regulations may be applicable,dependingon the nature and concentration of the matrix and the elementused to prepare the calibration solutions.6.Calibration of Equipment6.1 Balances and WeightsCalibrate balances and weightsperiodically,depending on use,or at least once every twelvemonths.Calibration shall be traceable to NIST.See MethodE 319.1This practice is under the jurisdiction of ASTM Committee E01 on AnalyticalChemistry for Metals,Ores,and Related Materials and is the direct responsibility ofSubcommittee E01.21 on Reference Material Planning,Proficiency Testing andLaboratory Accreditation.Current edition approved Feb.15,1992.Published June 1992.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available as Order No.COM 73-10504 from the National Technical Informa-tion Services,Springfield,VA 22161.4Reagent Chemicals,American Chemical Society Specifications,Am.ChemicalSoc.,Washington,DC.For suggestions on the testing of reagents not listed by theAmerican Chemical Society,see Rosen,J.Reagent Chemicals and Standards,D.Van Nostrand Co.,Inc.,New York,NY,and United States Pharmacopeia,UnitedStates Pharmacopeial Convention,Inc.,Rockville,MD.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.6.2 Glass and Plastic Laboratory WareAll glass andplastic volumetric flasks and pipets shall be of Class A,precision grade,within the tolerances established by NIST forthe appropriate type of glassware.See Practices E 50,Speci-fications E 288,and E 969,and NIST Circular 602.57.Preparation of Calibration Solutions7.1 GeneralUsually when calibrating an instrument,ananalyte stock solution is prepared first.From this solutionaliquots are taken by transfer pipets or by weight,and dilutedin volumetric flasks to yield a series of