ASTM E1786-2017a Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry《采用在线红外分光光度法测定液态氯中低含水量的标准试验方法》.pdf
《ASTM E1786-2017a Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry《采用在线红外分光光度法测定液态氯中低含水量的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E1786-2017a Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry《采用在线红外分光光度法测定液态氯中低含水量的标准试验方法》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E1786 17E1786 17aStandard Test Method forDetermination of Low Levels of Water in Liquid Chlorine byOn-Line Infrared Spectrophotometry1This standard is issued under the fixed designation E1786; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 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. Scope*1.1 This test method is designed for the on-line determination of the content of water
3、 in liquid chlorine in the concentrationrange of 0.5 to 15 mg/kg (ppm).1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.1.3 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid pr
4、ocedures, and safetyprecautions.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitation
5、s prior to use. Specific hazards statements are given in Section 7 and Note 3.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and
6、Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related MaterialsE806 Test
7、Method for Carbon Tetrachloride and Chloroform in Liquid Chlorine by Direct Injection (Gas ChromatographicProcedure)2.2 Federal Standards:349 CFR 173 Code of Federal Regulations Title 49 Transportation: Shippers General Requirements for Shipments andPackaging, including the following sections:173.30
8、4 Charging of Cylinders with Liquefied Compressed Gas173.314 Requirements for Compressed Gases in Tank Cars173.315 Compressed Gases in Cargo Tanks and Portable Tank Containers2.3 Other Document:4Chlorine Institute Pamphlet No. 1 Chlorine Basics3. Summary of Test Method3.1 Liquid chlorine continuousl
9、y flows through a special infrared cell where it is maintained as a liquid under its own pressure.A process infrared spectrometer scans from 400 to 4400 wavenumbers of the infrared transmission spectrum of liquid chlorine.1 This test method is under the jurisdiction of ASTM Committee D16 on Aromatic
10、 Hydrocarbons Aromatic, Industrial, Specialty and Related Chemicals and is the directresponsibility of Subcommittee D16.16 on Industrial and Specialty Product Standards.Current edition approved March 1, 2017July 1, 2017. Published March 2017July 2017. Originally approved in 1996. Last previous editi
11、on approved in 20082017 asE1786 08.E1786 17. DOI: 10.1520/E1786-17.10.1520/E1786-17a.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary p
12、age on the ASTM website.3 Code of Federal Regulations, Available from U.S. Government Printing Office, Superintendent of Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001,http:/www.access.gpo.gov.4 Available from The Chlorine Institute, Inc., 1300 Wilson Blvd., Suite 525, Arlington, VA 22
13、209, https:/www.chlorineinstitute.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM r
14、ecommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box
15、 C700, West Conshohocken, PA 19428-2959. United States1This spectrum then is ratioed to one obtained from the nitrogen-filled infrared cell previously. The ratioed spectrum is convertedto absorbance, and the net absorbance of water band at 1596 wavenumbers, relative to a reference at 1663 wavenumber
16、s, isdetermined.3.2 The amount of water corresponding to this net absorbance is determined from a calibration curve prepared from the infraredabsorbencies of standards which contain concentrations of water in liquid chlorine. These standards are prepared from manualsamples of liquid chlorine in tant
17、alum cylinders. Sample from each cylinder is introduced into a calibration infrared cell andmaintained as a liquid under its own pressure.4. Significance and Use4.1 Trace amounts of water may be detrimental to the use of chlorine in some applications. The amount of water in the chlorinemust be known
18、 to prevent problems during its use.5. Apparatus5.1 Process Infrared Spectrometer, capable of measurements in the 1600 wavenumber region. An FTIR with four wavenumberresolution is the instrument of choice, but dispersive instruments also may be used to achieve similar results.5.2 Special Infrared Ca
19、libration Cell (Fig. 1), as used for calibration. Neither cell size nor pathlength are critical to the analysis,but sensitivity and limit of detection are dependent on pathlength. The concentration range reported in the Section 1 is achievablewith a 60-mm pathlength cell constructed with the followi
20、ng: Figs. 2-75.2.1 Hastelloy C and 316 Stainless Steel Stock, suitable for machining,5.2.2 Silver Chloride Windows, 0.5 cm 2.5 cm, and5.2.3 Perfluoroelastomer Sheet, 0.762 mm (0.030 in.) thickness.5.3 Ball Valves, Monel 6.35 mm (14-in.) valve with pipe and 6.35 mm (14-in.) tube ends.5.4 Needle Valve
21、s, Nickel or Monel 6.35 mm (14-in.) valve with pipe and 6.35 mm (14-in.) tube ends.5.5 Sample Cylinder Assembly (Fig. 8), consisting of:FIG. 1 Infrared Cell (Drawing Not to Scale)E1786 17a25.5.1 Sample Cylinder, nickel, Monel, or tantalum, 400 to 1000-mL capacity, double-ended, with valves at each e
22、nd, speciallycleaned. Cylinders with both valves at one end and with a dip tube on one valve have been found to be satisfactory.Another optionis to construct special cylinders containing a septum fitting on one end.NOTE 1A procedure for cleaning cylinders and valves, for use with liquid chlorine, is
23、 given in Test Method E806, Appendix X2.5.5.2 One Needle and One Ball Valve, nickel body, having packing resistant to liquid chlorine. If nickel valves are not available,monel valves may be used.5.5.3 Septum, inserted into a 6.35 mm (14-in.)-in. nut.5.5.4 Glove Bag or Dry Box, purged with dry nitrog
24、en (less than 5 mg/kg (ppm) water vapor).5.5.5 Fittings, for transferring chlorine from one cylinder to another.5.5.6 One 0 to 10 L Syringe and One 0 to 25 L Syringe, 26 gage needle.5.5.7 Dewar Flask, of sufficient size to hold a cylinder surrounded by dry ice and methylene chloride. The Dewar flask
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