ASTM_D_3375_-_18.pdf

Designation:D337518Standard Test Method forColumn Capacity of Particulate Mixed Bed IonExchange Materials1This standard is issued under the fixed designation D3375;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 test method covers the determination of the perfor-mance of particulate mixed bed ion exchange materials in theregenerated form when used for deionization.It is intended foruse in testing unused mixed bed materials and samples ofregenerated mixed beds from operating units.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.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 environmental 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,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1293 Test Methods for pH of WaterD1782 Test Methods for Operating Performance of Particu-late Cation-Exchange MaterialsD2687 Practices for Sampling Particulate Ion-Exchange Ma-terials3.Terminology3.1 DefinitionsFor definitions of terms related to water,refer to Terminology D1129.4.Summary of Test Method4.1 This test method consists of exhausting a column ofregenerated mixed bed ion exchange material to a specific endpoint with an influent solution of known composition andvolume.5.Significance and Use5.1 This test method can be used to evaluate unused mixedbed ion exchange materials for conformance to specifications.When a representative sample of the mixed bed can beobtained from an operating unit,this test method can be usedto evaluate the regeneration efficiency by comparison with thesame data obtained with new material from the same manu-factured lots,or retained samples of the in-place products.5.2 This test method provides for the calculation of capacityin terms of the volume of water treated to a conductivity endpoint.5.3 The test method as written assumes that the cationexchange material has been regenerated to the hydrogen formwith acid and the anion exchange material has been regener-ated with alkali to the hydroxide or free-base form.In certainapplications a cation exchange material in the potassium,ammonium,or other monovalent form may be encountered.Such materials may be tested following this procedure usingTest Water A(Test Methods D1782)as the influent andsubstituting the hardness end point(Test Methods D1782)forthe end points prescribed herein.5.4 In most cases the product tested will be properly mixedand will contain the correct proportions of anion and cationexchange materials.However,if the pH as well as theconductivity of the effluent is measured,the test method willindicate which of the components is present in excess;an acideffluent at breakthrough indicating an excess of regeneratedcation exchange groups and an alkaline effluent an excess ofregenerated anion exchange groups.In such cases the volumesof the two components obtained in the final backwash will1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.08 on Membranes and IonExchange Materials.Current edition approved May 1,2018.Published May 2018.Originallyapproved in 1975.Last previous edition approved in 2016 as D3375 16.DOI:10.1520/D3375-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM 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 International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 indicate whether this imbalance arises from improper regen-eration or from an improper ratio of the two components.Itshould be noted,however,