ASTM_D_6302_-_98_2009.pdf

Designation:D630298(Reapproved 2009)Standard Practice forEvaluating the Kinetic Behavior of Ion Exchange Resins1This standard is issued under the fixed designation D6302;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 practice is intended to evaluate changes in kineticperformance of ion exchange resins used in mixed beds toproduce high purity water.Within strict limitations,it also maybe used for comparing resin of different types.This standarddoes not seek to mimic actual operating conditions.Specificchallenge solutions and conditions are specified.At the optionof the user,other conditions may be tested.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2187 Test Methods for Physical and Chemical Propertiesof Particulate Ion-Exchange ResinsD2687 Practices for Sampling Particulate Ion-Exchange Ma-terialsD5391 Test Method for Electrical Conductivity and Resis-tivity of a Flowing High Purity Water Sample3.Terminology3.1 Definitions For definitions of terms used in thispractice,refer to Terminology D1129.4.Summary of Practice4.1 An apparatus is described in which a specified volumeof regenerated resin sample is mixed with a corresponding newresin.The mixed bed then is operated at a controlled high flowrate on an influent of known composition,and the quality of theeffluent is measured by conductivity,and if agreed upon,otherappropriate analytical procedures.5.Significance and Use5.1 This practice is intended to evaluate changes in theperformance of ion exchange resins used in mixed bedsoperating as polishing systems for solutions of low ionicstrength,typically,17.5 M(see 8.3).NOTE1Pressure relief should be provided for this system to allow nomore pressure than the materials can tolerate,typically 50 psig or less.8.Reagents8.1 Purity of ReagentsReagents meeting the specificationsof the Committee on Analytical Reagents of the AmericanChemical Society may not be suitable for use in this practice.All reagents used should be of the highest grade commerciallyavailable and should be tested for both anionic and cationicimpurities by ion chromatography after the feed solutions havebeen prepared.3,48.2 Purity of Water Unless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Specification D1193,Type I.It shall be checked by ionchromatography at the ppb level prior to use,if ion chroma-tography will be used for analysis.8.3 Standard Cation ResinNew hydrogen-form,strongacid,cation resin is to be used;nuclear grade is preferred.Donot regenerate this resin.This resin should be stored inimpermeable containers at temperatures that do not exceed25C.Backwash the resin with water at 100%expansion for atleast 15 min.The resin should be rinsed thoroughly with waterto 17.5 M resistivity before being used in a kinetics test.The same cation resin may be used in the test column,as wellas the cation column.It is recommended that a specific typeand brand of resin be used consistently where results are to becompared.8.4 Standard Anion ResinUse new,hydroxide-form,strong base anion resin;nuclear grade preferred.Follow otherrequirements as given in 8.3.8.5 Test Solutions Test solutions can be modified forspecific systems,however,the following are recommended forroutine testing.Although a target feed injection rate of 0.5mL/min is used here,the feed concentrations and meteringpump flows can be altered,so long as the test column influentconcentrations and flow rate are nominal as specified.8.5.1 Ammonia Feed Solution(3.0 g/L as NH3)Optional forUse with Ammoniated Systems Tare a beaker with about 50mL of water on an analytical balance with 0.01-g sensitivity.Add 20.9 g of concentrated ammonium hydroxide(sp.gr.0.90)from a dropping bottle.Transfer to a 2-L volumetric flask,anddilute to volume.Mix well.When delivered at the rate of 0.5mL/min into 1 L/min flow,the concentration in the influentshould be 1.5 mg NH3/L.NOTE2Ammonium hydroxide generates irritating ammonia vapors.8.5.2 Sodium Sulfate Feed Solution(0.9 g Na2SO4/L)Drythe Na2SO4for 1 h at 100105C,then store in a desiccator.Weigh 0.900 g of the anhydrous sodium sulfate,and dissolve itin 1 L of water.Mix well.When delivered at the rate of 0.5mL/min into 1 L/min flow,the concentration of the influentshould be 0.145 mg/L Na and 0.300 mg/L SO4.8.6