ASTM D7903-14(R2020) pdf free download

ASTM D7903-14(R2020) pdf free download.Standard Practice for Determining the Capacity of Oxygen Removal Ion Exchange Cartridges
1. Scope
1.1 This practice covers the determination of the perfor- mance of oxygen removal ion exchange resin cartridges in the regenerated form when used for removing dissolved oxygen from water. The test can be used to determine the initial capacity ofunused cartridges or the remaining capacity ofused cartridges. In this case, performance is defined as oxygen removal capacity (or throughput) to a defined endpoint. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory 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 the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Practice
4.1 This practice will evaluate the capacity of an oxygen removal cartridge for water by running a test solution ofknown oxygen content through a cartridge to a specified endpoint. The volume will enable a determination of the capacity for the cartridge to remove dissolved oxygen in water.
5. Significance and Use
5.1 This practice can be used to evaluate unused oxygen removal ion exchange cartridges for conformance to specifi- cations. 5.2 This practice provides for the calculation of capacity in terms of the volume of water treated to an end point level of dissolved oxygen. 5.3 The practice as written assumes that the oxygen removal ion exchange resins in the cartridge are either partially or fully regenerated. Regeneration of the resins is not part of this practice. 5.4 This practice provides for the calculation of capacity on a cartridge basis. 5.5 This practice may be used to test different size oxygen removal resin cartridges. The flow rate of test water and the frequency of sampling are varied to compensate for the approximate volume of resin in the test cartridge.
6. Apparatus
6.1 Test assembly (Fig. 1), consisting of the following: 6.1.1 Cartridge, and pressure vessel, if required. Connec- tions shall be provided at the top and the bottom for the admission and removal of the exhausting solution as described in 8.3, 8.4, and 8.5. 6.1.2 Test solution tank. Adequate means of regulating and measuring flow through the cartridge shall be provided. If the test flow rate (8.2) cannot be obtained by gravity feed, then a pump should be used. Make sure all fittings, connections, and wetted pump portals are secure and tight to the atmosphere.6.1.3 Measuring oxygen levels of the water in the input and the output ofthe test cartridge in accordance with Test Methods D888. A continuous recorder is recommended.
7. Reagents
7.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Commit- tee on Analytical Reagents of the American Chemical Society, where such specifications are available. 3 Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination. 7.2 Purity ofWater—All reference to water in this practice shall be understood to mean Reagent Water Type I or II conforming 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 D—Prepare the test water by filling tank with Reagent Water Type I or Type II and aerate to equilibrate the dissolved oxygen levels. Calculate the theoretical level of saturated oxygen based on temperature and pressure, and when this level has been reached stop the aeration process. Let the test water sit for at least 6 to 8 hours and check the dissolved oxygen level. If there is a significant reduction there may be an oxygen demand from biochemical oxygen demand (BOD) contamination. If the dissolved oxygen level has remained stable you may proceed with the test. A continuous monitor of the dissolved oxygen levels in the test water must be maintained throughout the practice. 7.3.1 A single test requires approximately 1000 L of this solution for each litre of oxygen removal ion exchange resin that a cartridge contains assuming dissolved oxygen levels close to complete saturation.