ASTM_D_6071_-_14.pdf

Designation:D607114Standard Test Method forLow Level Sodium in High Purity Water by Graphite FurnaceAtomic Absorption Spectroscopy1This standard is issued under the fixed designation D6071;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()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of tracesodium in high purity water.The method range of concentra-tion is 1 to 40 g/L sodium.The analyst may extend the rangeonce its applicability has been ascertained.NOTE1It is necessary to perform replicate analysis and take anaverage to accurately determine values at the lower end of the statedrange.1.2 This test method is a graphite furnace atomic absorptionspectrophotometric method for the determination of tracesodium impurities in ultra high purity water.1.3 This test method has been used successfully with a highpurity water matrix.2It is the responsibility of the analyst todetermine the suitability of the test method for other matrices.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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:3D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1192 Guide for Equipment for Sampling Water and Steamin Closed Conduits(Withdrawn 2003)4D1193 Specification for Reagent WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD3919 Practice for Measuring Trace Elements in Water byGraphite Furnace Atomic Absorption SpectrophotometryD4453 Practice for Handling of High Purity Water SamplesD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D1129.4.Summary of Test Method4.1 Sodium is determined by atomic absorption utilizing agraphite furnace for sample atomization.4.2 Asample volume of several microlitres,depending uponthe concentration of the analyte,is deposited on a graphite tubehoused within an electrical furnace,and the system is heated inan inert gas environment.The sample is evaporated to dryness,ashed(charred or pyrolyzed),and atomized.4.3 Ground-state atoms are produced during the atomizationstage of the temperature program.The ground-state atomsabsorb the energy at a specific wavelength produced from asource as they are bombarded by the energy.The amount ofenergy absorbed is proportional to the concentration of theanalyte in the sample.4.4 The absorption signal produced during atomization isrecorded on a chart recorder or stored in microprocessormemory and compared to those standards taken through thesame process by means of an analytical curve.4.5 A general guide for graphite furnace applications isgiven in Practice D3919.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits,Analysis of Water for Power Generation and Process Use,On-Line Water Analysis,and Surveillance of Water.Current edition approved Sept.15,2014.Published September 2014.Originallyapproved in 1996.Last previous edition approved in 2013 as D6071 13.DOI:10.1520/D6071-14.2RP2712 Sub ProgramGrab Sample Method Validation Report Results,Electric Power Research Institute,Palo Alto,CA,1987.3For 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.4The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 Small quantities of sodium,1 to 10 g/L,can besignificant in high pressure boiler systems and in nuclear powersystems.Steam condensate from such systems must have lessthan 10 g/L.In addition,condensate polishing system efflu-ents should have less than 1 g/L.Graphite furnace atomicabsorption spectroscopy(GFAAS)represents technique fordetermining low concentrations of sodium.6.Interferences6.1 No known interferences from other constituents arefound in high purity waters.6.2 For a complete discussion on inte