ASTM_D_1141_-_98_2013.pdf

Designation:D114198(Reapproved 2013)Standard Practice forthe Preparation of Substitute Ocean Water1This standard is issued under the fixed designation D1141;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 Department of Defense.1.Scope1.1 This practice covers the preparation of solutions con-taining inorganic salts in proportions and concentrations rep-resentative of ocean water.2NOTE1Since the concentrations of ocean water varies with samplinglocation,the gross concentration employed herein is an average of manyreliable individual analyses.Trace elements,occurring naturally in con-centrations below 0.005 mg/L,are not included.1.2 This practice provides three stock solutions,each rela-tively concentrated but stable in storage.For preparation ofsubstitute ocean water,aliquots of the first two stock solutionswith added salt are combined in larger volume.An addedrefinement in adjustment of heavy metal concentration isprovided by the addition of a small aliquot of the third stocksolution to the previous solution.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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:3D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterE200 Practice for Preparation,Standardization,and Storageof Standard and Reagent Solutions for Chemical Analysis3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 chlorinity,nthe weight of silver ion(g)required tocompletely precipitate the halides in 0.3285 kg of water(g/kg).4.Significance and Use4.1 This substitute ocean water may be used for laboratorytesting where a reproducible solution simulating sea water isrequired.Examples are for tests on oil contamination,deter-gency evaluation,and corrosion testing.NOTE2The lack of organic matter,suspended matter,and marine lifein this solution does not permit unqualified acceptance of test results asrepresenting performance in actual ocean water.Where corrosion isinvolved,the results obtained from laboratory tests may not approximatethose secured under natural testing conditions that differ greatly fromthose of the laboratory,and especially where effects of velocity,saltatmospheres,or organic constituents are involved.Also the rapid depletionof reacting elements present in low concentrations suggests caution indirect application of results.5.Reagents and Materials5.1 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 onAnalytical Reagents of theAmerican Chemical Society.4Other grades may be used,provided it is first ascertained thatthe reagent is of sufficiently high purity to permit its usewithout lessening the accuracy of the determination.5.2 Purity of Water Unless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Specification D1193,Type II.1This practice is under the jurisdiction of ASTM Committee D19 on Water andis the responsibility of Subcommittee D19.02 on Quality Systems,Specification,and Statistics.Current edition approved Jan.1,2013.Published January 2013.Originallyapproved in 1950.Last previous edition approved in 2008 as D1141 98(2008).DOI:10.1520/D1141-98R13.2This practice is based upon the following studies:May and Black,“Synthetic Ocean Water,”Naval Research Laboratory ReportP-2909,August 1946.May,T.P.and Alexander,A.L.,“Spray Testing with Natural and Synthetic SeaWater,Part ICorrosion Characteristics in the Testing of Metals,”Proceedings,ASTM,Vol 50,1950.Alexander,A.L.and May,T.P.,“Spray Testing with Natural and Synthetic SeaWater,Part IIA Study of Organic Coatings,”Proceedings,ASTM,Vol 50,1950.3For 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.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Conventio