ASTM_D_3372_-_17.pdf

Designation:D337217Standard Test Method forMolybdenum in Water1This standard is issued under the fixed designation D3372;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the determination of dissolvedandtotalrecoverablemolybdenuminmostwaters,wastewaters,and brines by atomic absorption spectroscopy.21.2 This test method is applicable in the range from 1 to 25g/L of molybdenum.The range may be extended by dilutionof the sample.1.3 This test method has been used successfully with naturaland reagent waters.It is the users responsibility to ensure thevalidity of this test method for waters of untested matrices.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversion to inch-pound units that are provided for informa-tion only and are not considered standard.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.For specificprecautionary statements,see 8.16 and 11.12.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1976 Test Method for Elements in Water by Inductively-Coupled Argon Plasma Atomic Emission SpectroscopyD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD4691 Practice for Measuring Elements in Water by FlameAtomic Absorption SpectrophotometryD4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5673 Test Method for Elements in Water by InductivelyCoupled PlasmaMass SpectrometryD5810 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 standard,refer toTerminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1continuing calibration blank,na solution contain-ing no analytes(of interest)which is used to verify blankresponse and freedom from carryover.3.2.2 continuing calibration verification,na solution(orset of solutions)of known concentration used to verify freedomfrom excessive instrumental drift;the concentration is to coverthe range of calibration curve.3.2.3 laboratory control sample,na solution with thecertified concentration(s)of the analytes.3.2.4 total recoverable molybdenum,na descriptive termrelating to the metal forms of molybdenum recovered in theacid-digestion procedure specified in this test standard.4.Summary of Test Method4.1 Molybdenum is determined by atomic-absorption spec-trophotometry.Theelementischelatedwith8-hydroxyquinoline,extracted with methyl isobutyl ketone,and the extract aspirated into the nitrous oxide-acetylene flameof the spectrophotometer.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved June 1,2017.Published June 2017.Originallyapproved in 1975.Last previous edition approved in 2012 as D3372 12.DOI:10.1520/D3372-17.2Chau,Y.K.,and Lum-Shue-Chan,K.,“Atomic Absorption Determination ofMicrogram Quantities of Molybdenum in Lake Waters,”Analytica Chimica Acta,Vol 48,1969,p.205.3For 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.*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.Significance and Use5.1 Molybdenum can be found in waste that results fromchemical cleaning of