1、Designation:D845722Standard Practice forCleaning Glass and Plastic Labware Used in Metal andMetalloid Analyses1This standard is issued under the fixed designation D8457;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、 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 practice uses dilute nitric acid to clean glass andplastic labware used in laboratories preparing and analyzingsamples for
3、 metal and metalloid content.1.2 The values stated in SI units are to be regarded asstandard.1.3 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 environ
4、mental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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
5、,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheres3.Terminolog
6、y3.1 DefinitionsFor definitions of terms,refer to Termi-nologies D1129,D1193,and D1356.4.Summary of Practice4.1 Labware is washed with laboratory detergent,rinsedwith tap water,soaked in dilute nitric acid,rinsed with ASTMType I Water,and allowed to dry in a fume hood.4.2 Alternatively,labware is so
7、aked in dilute nitric acid in aplastic tub in a fume hood,rinsed with ASTM Type I Water,and allowed to dry in a fume hood.5.Significance and Use5.1 This practice is intended for use in laboratories usinglabware for the preparation and analysis of samples collectedfor analysis for metals or metalloid
8、s,or both.6.Reagents and Materials6.1 Purity of ReagentsReagent grade chemicals shall beused in this practice.Unless otherwise indicated,it is intendedthat all reagents conform to the specifications of the Committeeon Analytical Reagents of the American Chemical Society,where such specifications are
9、 available.Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lesseningaccuracy of the determination.6.2 Nitric AcidConcentrated,16.0 M HNO3,suitable foratomic spectrometry analysis such as spectroscopic grade.6.3 Purity
10、of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water as definedby Type 1 of Specification D1193.7.Procedure7.1 Wash glassware and plastic equipment with laboratorydetergent,rinse with tap water,soak for at least 4 hours involume/volume 1+1 nitric acid and w
11、ater,rinse three timeswithASTM Type I Water,and allow to dry preferably in a fumehood.Commercial,automatic systems are available that per-form a similar process.7.2 Alternatively,soak glassware and plastic equipment involume/volume 1+1 nitric acid and water in a plastic tubpreferably in a working ho
12、od with the hood sash down,rinsethree times with ASTM Type I Water,and allow to drypreferably in a fume hood.8.Keywords8.1 acid wash;cleaning;labware1This practice is under the jurisdiction ofASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.01 on Quality Control.
13、Current edition approved May 1,2022.Published May 2022.DOI:10.1520/D8457-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe AST
14、M website.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
15、International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard
16、 are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your commen
