ASTM_D_6568_-_00_2018.pdf

Designation:D656800(Reapproved 2018)Standard Guide forPlanning,Carrying Out,and Reporting Traceable ChemicalAnalyses of Water Samples1This standard is issued under the fixed designation D6568;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.Scope1.1 This guide sets a protocol for generating and reportingchemical analyses that are traceable to SI units or to certifiedreference materials in laboratories that serve the water andenvironmental industry.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.3 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:D1129 Terminology Relating to WaterD6362 Practice for Certificates of Reference Materials forWater AnalysisIEEE/ASTM SI 101997 Standard for Use of the Interna-tional System of Units(SI):The Modern Metric System2.2 Other Documents:ISO Guide 17025 General Requirements for the Competenceof Calibration and Testing Laboratories2ISO Guide 30 Terms and Definitions Used in Connectionwith Reference Materials2VIM International Vocabulary of Basic and General Termsin Metrology,ISO:2nd ed.,199323.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:3.2.1 certified reference material,nreference material,accompanied by a certificate,one or more of whose propertyvalues are certified by a procedure which established itstraceability to an accurate realization of the unit in which theproperty values are expressed,and for which each certifiedvalue is accompanied by an uncertainty at a stated level ofconfidence.ISO Guide 303.2.1.1 DiscussionThere is significant variation in theoverall quality of commercially available certified referencematerials and caution should be used when choosing certifiedreference materials.Use Practice D6362 to provide guidance asto what information needs to be included on Certificate of acertified reference material.3.2.2 SI units,nthis is the International System of Units(SI)which is the modernized metric system as described inIEEE/ASTM SI 101997.A SI Quick Reference Guide isincluded in ASTM BOS Volumes 11.01 and 11.02.3.2.3 traceability,nproperty of the result of a measure-ment or the value of a standard whereby it can be related,witha stated uncertainty,to stated references,usually national orinternational standards,through an unbroken chain ofcomparisons.ISO Guide 303.2.4 uncertainty(of measurement),nparameter,associ-ated with the result of a measurement that characterizes thedispersion of values that could reasonably be attributed to themeasured.VIM3.2.5 work plan,na documented procedure intended foruse by a laboratory to meet the measurement traceabilityrequirements of a defined need.4.Significance and Use4.1 This guide establishes basic requirements which shouldbe met by water and environmental laboratories that generateand report test chemical analyses which the laboratory clientdesires to be traceable to SI units(Note 1)or certified reference1This guide is under the jurisdiction of ASTM Committee D19 on Water and isthe direct responsibility of Subcommittee D19.02 on Quality Systems,Specification,and Statistics.Current edition approved Aug.1,2018.Published September 2018.Originallyapproved in 2000.Last previous edition approved in 2011 as D6568 00(2011).DOI:10.1520/D6568-00R18.2Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright 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 materials traceable to SI units.Traceability of chemical analy-ses is important because it provides a uniform basis for thecomparison of results from different measurement systems andbecause it relates those results to our current knowledge ofphysical laws(Note 2).NOTE1Acertified reference material traceable to SI units is a certifiedreference material wh