1、Designation:C 1226 93(Reapproved 2006)Standard Test Method forSoluble Chlorides in Asbestos1This standard is issued under the fixed designation C 1226;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、 in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the leaching out of the solublechlorides in asbestos and the volumetric determination ofchloride ion in the leachate.1.2
3、 WarningBreathing of asbestos dust is hazardous.Asbestos and asbestos products present demonstrated healthrisks for users and for those with whom they come into contact.In addition to other precautions,when working with asbestos-cement products,minimize the dust that results.For informa-tion on the
4、safe use of chrysoltile asbestos,refer to“Safe Useof Chrysotile Asbestos:A Manual on Preventive and ControlMeasures.”21.3 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
5、safety and health practices and determine the applica-bility of regulatory limitations prior to use.See 1.2 for aspecific hazard warning.2.Referenced Documents2.1 ASTM Standards:3D 1193 Specification for Reagent WaterD 2590 Test Method for Sampling Chrysotile AsbestosD 2946 Terminology for Asbestos
6、and AsbestosCementProductsD 3879 Test Method for Sampling Amphibole AsbestosE 177 Practice for Use of the Terms Precision and Bias inASTM Test Methods2.2QAMA Standards:A-2-72 Definitions of Terms Relating to Asbestos4G-5-74 Soluble Chlorides42.3ACS Standards:Specifications of the Committee on Analyt
7、ical Reagents53.Terminology3.1 Refer to Terminology D 2946 and QAMA StandardA-2-72.4.Summary of Test Method4.1 The asbestos is leached with water in a Soxhlet extractorfor 3 h.4.2 Dilute mercuric nitrate solution is added to an acidifiedspecimen of leachate in the presence of mixed diphenyl-carbazon
8、e bromphenol blue indicator.The end point of thetitration is the formation of the blue-violet mercury diphenyl-carbazone complex(see Note 5).4.3 An alternative titration by means of an automatic titratoris presented in Annex A1.4.4 An alternative simplified titration,suitable for non-referee interna
9、l quality control,is presented in Annex A2.5.Significance and Use5.1 This test method provides an evaluation of the water-soluble chlorides in asbestos.It is used to determine thesuitability of asbestos for use in products,such as gaskets,thatmay be in contact with metals under hydrothermal conditio
10、nsthat foster chloride ion corrosion.6.Interferences6.1 Zinc,lead,nickel,ferrous,and chromous ions affect thesolubility of the chloride ion and the end point color,but theydo not reduce the accuracy of the titration when present inconcentrations up to 100 ppm.6.2 Copper is tolerable up to 50 ppm.6.3
11、 Titration in the presence of chromate ion requires anindicator with intensified background color,such as alphazur-ine,and prior reduction for concentrations above 100 ppm.1This test method is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and is the direct responsib
12、ility of SubcommitteeC17.03 on Asbestos-Cement Sheet Products and Accessories.Current edition approved June 1,2006.Published June 2006.Originallyapproved in 1993.Last previous edition approved in 2002 as C 1226-93(2002)e1.2Available from The Asbestos Institute,http:/ referenced ASTM standards,visit
13、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.4Published in the Chrysotile Asbestos Test Manual.Available from the AsbestosInstitute,1002 Sherbrooke
14、St.W.,Suite 1750,Montreal,QC,Canada H3A 3L6.5Reagent 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.
15、,and the United States Pharmacopeiaand National Formulary,U.S.Pharmaceutical Convention,Inc.(USPC),Rockville,MD.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version
16、or withdrawn.Contact ASTM International(www.astm.org)for the latest information 6.4 Ferric ion above 10 ppm must be reduced beforetitration,and sulphite ion must be oxidized.6.5 A part of any bromide and fluoride ion that is presentwill also be titrated with the chloride ion.6.6 Quaternary ammonium salts also interfere,if present insignificant concentrations(1 to 2 ppm).6.7 Deep coloration of the leachate may also interfere.7.Apparatus7.1 Microburet,1 or 5-cm3capacity,with 0.01-cm3gradu-ation in
