1、Designation:D685018Standard Guide forQC of Screening Methods in Water1This standard is issued under the fixed designation D6850;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 indicat
2、es the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This guide covers general considerations for the qualitycontrol(QC)practices for use with screening methods fororganic and inorganic constituents in water.Methods arep
3、rovided by various standard setting bodies,governmentalagencies,as well as many domestic and international manu-facturers.1.2 This guide provides general QC procedures that areapplicable to a broad range of screening methodologies.Theseprocedures help to ensure the quality of data that is generated.
4、Additional,method-specific or project specific requirementsmay be necessary.This guide also includes general consider-ations regarding proper utilization of screening methods.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.
5、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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 Th
6、is 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(
7、TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD4840 Guide for Sample Chain-of-Custody ProceduresD5172 Guide for Documenting the Standard Operating Pro-cedures Used for the Analysis of WaterD5847 Practice for Writing Qu
8、ality Control Specificationsfor Standard Test Methods for Water AnalysisD5905 Practice for the Preparation of Substitute Wastewater3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129 and Practice D5847.3.2 Definitions of Terms Specific to This
9、Standard:3.2.1 action level,na concentration of the analyte ofconcern at which some further action is required or suggested.3.2.2 batch,na set(group)of samples analyzed alongwith QC samples;the quality of the sample-sets results isindicated by the results from the QC samples.3.2.2.1 DiscussionThe nu
10、mber of samples in the batch isdefined by the task group responsible for the method.SeePractice D5847 for definition and discussion of batch and batchsize.3.2.3 false negative,na negative response for a samplethat contains the target analyte(s)at or above the stated actionlevel.3.2.4 false positive,
11、na positive response for a sample thatcontains the target analyte(s)below the stated action level.3.2.5 qualitative method,na validated method that detectspresence or absence of an analyte at a specified screening limit.3.2.6 screening limit,nthe concentration of analyte thatcan be determined with a
12、 given certainty.3.2.6.1 DiscussionThe task group responsible for themethod establishes the value of the screening limit.3.2.7 screening method,na method that is used to separateor categorize samples.3.2.7.1 DiscussionAn example would be a method thatprovides results that would be used to separate s
13、amples into:(1)those that contain an analyte and(2)those that do notcontain and analyte above or below a specified action level.3.2.8 semi-quantitative method Type 1,na method whoseresults are given in specified,discreet concentration ranges.3.2.8.1 DiscussionTwo types of examples of this methodwoul
14、d include semi-quantitative immunoassays or test strips.The cutoff concentration of the ranges has been predefined.1This guide is under the jurisdiction of ASTM Committee D19 on Water and isthe direct responsibility of Subcommittee D19.05 on Inorganic Constituents inWater.Current edition approved Ma
15、y 1,2018.Published May 2018.Originallyapproved in 2003.Last previous edition approved in 2013 as D6850 13.DOI:10.1520/D6850-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,ref
16、er 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 Organiz
