1、Designation: D7903 14Standard Practice forDetermining the Capacity of Oxygen Removal Ion ExchangeCartridges1This standard is issued under the fixed designation D7903; 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 covers the determination of the perfor-mance of oxygen removal ion exchange resin cartridges in theregenerat
3、ed form when used for removing dissolved oxygenfrom water. The test can be used to determine the initialcapacity of unused cartridges or the remaining capacity of usedcartridges. In this case, performance is defined as oxygenremoval capacity (or throughput) to a defined endpoint.1.2 The values state
4、d 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 all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and
5、health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D888 Test Methods for Dissolved Oxygen in WaterD1129 Terminology Relating to WaterD1193 Specification for Reagent Water3. Terminology3.1 DefinitionsFor definitions of t
6、erms related to water,refer to Terminology D1129.4. Summary of Practice4.1 This practice will evaluate the capacity of an oxygenremoval cartridge for water by running a test solution of knownoxygen content through a cartridge to a specified endpoint. Thevolume will enable a determination of the capa
7、city for thecartridge to remove dissolved oxygen in water.5. Significance and Use5.1 This practice can be used to evaluate unused oxygenremoval ion exchange cartridges for conformance to specifi-cations.5.2 This practice provides for the calculation of capacity interms of the volume of water treated
8、 to an end point level ofdissolved oxygen.5.3 The practice as written assumes that the oxygen removalion exchange resins in the cartridge are either partially or fullyregenerated. Regeneration of the resins is not part of thispractice.5.4 This practice provides for the calculation of capacity ona ca
9、rtridge basis.5.5 This practice may be used to test different size oxygenremoval resin cartridges. The flow rate of test water and thefrequency of sampling are varied to compensate for theapproximate volume of resin in the test cartridge.6. Apparatus6.1 Test assembly (Fig. 1), consisting of the foll
10、owing:6.1.1 Cartridge, and pressure vessel, if required. Connec-tions shall be provided at the top and the bottom for theadmission and removal of the exhausting solution as describedin 8.3, 8.4, and 8.5.6.1.2 Test solution tank. Adequate means of regulating andmeasuring flow through the cartridge sh
11、all be provided. If thetest flow rate (8.2) cannot be obtained by gravity feed, then apump should be used. Make sure all fittings, connections, andwetted pump portals are secure and tight to the atmosphere.6.1.3 Measuring oxygen levels of the water in the input andthe output of the test cartridge in
12、 accordance with Test MethodsD888. A continuous recorder is recommended.7. Reagents7.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the
13、American Chemical Society,1This practice is under the jurisdiction of ASTM Committee D19 on Water andis the direct responsibility of Subcommittee D19.08 on Membranes and IonExchange Materials.Current edition approved Jan. 1, 2014. Published January 2014. DOI: 10.1520/D7903-14.2For referenced ASTM st
14、andards, 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,
15、 PA 19428-2959. United States1where such specifications are available.3Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.7.2 Purity of WaterAll reference to water in this pract
16、iceshall be understood to mean Reagent Water Type I or IIconforming to Specification D1193, with the additional re-quirement that the silica concentration is less than 0.1 mg/L.7.3 Dissolved Oxygen Ion Exchange Test Water DPreparethe test water by filling tank with Reagent Water Type I or TypeII and
17、 aerate to equilibrate the dissolved oxygen levels.Calculate the theoretical level of saturated oxygen based ontemperature and pressure, and when this level has been reachedstop the aeration process. Let the test water sit for at least 6 to8 hours and check the dissolved oxygen level. If there is as
18、ignificant reduction there may be an oxygen demand frombiochemical oxygen demand (BOD) contamination. If thedissolved oxygen level has remained stable you may proceedwith the test. A continuous monitor of the dissolved oxygenlevels in the test water must be maintained throughout thepractice.7.3.1 A
19、single test requires approximately 1000 L of thissolution for each litre of oxygen removal ion exchange resinthat a cartridge contains assuming dissolved oxygen levelsclose to complete saturation.8. Procedure8.1 Measure the outside diameter and length of the ionexchange cartridge. Calculate the over
20、all cartridge volume (inlitres) as follows:Vc5 D2L#4!1000!(1)where:D = cartridge diameter, in cm, andL = cartridge length, in cm.8.2 Using the cartridge volume calculated in 8.1, calculatethe test flow rate (in mL/min) as follows:Q 5 30Vc(2)where:Vc= cartridge volume, in litres.NOTE 1For multi-tube
21、cartridges the volume is the sum of thevolumes of all the tubes.8.3 Slowly introduce Reagent Water at the bottom of thecartridge until the cartridge is full. Allow water to stand in thecartridge for14 hour to “condition” the resin prior to the test.Expel all air before proceeding.8.4 Slowly introduc
22、e Test Water D. Increase the flow rate Qto the value determined in 8.2, adjusting the rate as requiredwith a valve or other flow restriction in the effluent line.8.5 Measure and record the influent and effluent dissolvedoxygen levels each volumetric increment equal to 50 Vc.Continue until the efflue
23、nt dissolved oxygen value reaches12the influent dissolved oxygen value, then record the totalvolume of test water processed (VT) in litres.3Reagent Chemicals, American Chemical Society Specifications, AmericanChemical Society, Washington, DC. For suggestions on the testing of reagents notlisted by t
24、he American Chemical Society, see Analar Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.FIG. 1 Typical Apparatus for Performance Testing of Oxygen Removal Ion Exchang
25、e CartridgesD7903 1429. Calculation9.1 The operating capacity is calculated on a cartridge basisusing a dissolved oxygen end point equal to one half thedissolved oxygen level of the feed water.9.2 Calculate the operating capacity to the dissolved oxygenend point as follows:Capacity, grams of oxygen
26、removedcartridge 5 C 3 VT(3)where:C = total dissolved oxygen in Test Water D expressed ingrams per litre as described in 7.3,VT= volume of test water used, per cartridge, litres,NOTE 2Other end points may be agreed upon. When this is done thespecies and level selected should be specified with the re
27、sults.10. Report10.1 The report of results of this practice should include notonly the capacity as calculated above but the end point used.For certification purposes the averaging of results from threeseparate samples is customary.11. Precision and Bias11.1 Refer to Test Method D888 for precision an
28、d bias indissolved oxygen measurements.12. Quality Control12.1 In the analysis of ion exchange resins, it is not possibleto prepare a known standard resin for comparison with theactual samples. Therefore it is impossible to test the accuracyof the results, and this practice does not include a biasst
29、atement.12.2 The cartridge effluent is analyzed in accordance withTest Methods D888. Such analyses are subject to the qualitycontrol requirements of the referenced methods.13. Keywords13.1 cartridge capacity; dissolved oxygen; ion exchange;oxygen removal cartridgeASTM International takes no position
30、 respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard 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.T
31、his 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 In
32、ternational Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address show
33、n below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D7903 143
