ASTM E1786-2008 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry《在线红外分光光度法测定液氯中水的低等级的标准试验方法》.pdf
《ASTM E1786-2008 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry《在线红外分光光度法测定液氯中水的低等级的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E1786-2008 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry《在线红外分光光度法测定液氯中水的低等级的标准试验方法》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E 1786 08Standard Test Method forDetermination of Low Levels of Water in Liquid Chlorine byOn-Line Infrared Spectrophotometry1This standard is issued under the fixed designation E 1786; the number immediately following the designation indicates the year oforiginal adoption or, in the ca
2、se of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method is designed for the on-line determina-tion of the content of water in l
3、iquid chlorine in the concen-tration range of 0.5 to 15 mg/kg (ppm).1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 Review the current Material Safety Data Sheets (MSDS)for detailed information concerning toxicity, firs
4、t aid proce-dures, and safety precautions.1.4 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 health practices and determine the applica-bility of regulator
5、y limitations prior to use. Specific hazardsstatements are given in Section 7 and Note 3.2. Referenced Documents2.1 ASTM Standards:2D 1193 Specification for Reagent WaterE 806 Test Method for Carbon Tetrachloride and Chloro-form in Liquid Chlorine by Direct Injection (Gas Chro-matographic Procedure)
6、2.2 Federal Standards:349 CFR 173 Code of Federal Regulations Title 49 Trans-portation: Shippers General Requirements for Shipmentsand Packaging, including the following sections:173.304 Charging of Cylinders with Liquefied CompressedGas173.314 Requirements for Compressed Gases in Tank Cars173.315 C
7、ompressed Gases in Cargo Tanks and PortableTank Containers2.3 Other Document:4Chlorine Institute Pamphlet No. 77 Sampling LiquidChlorine3. Summary of Test Method3.1 Liquid chlorine continuously flows through a specialinfrared cell where it is maintained as a liquid under its ownpressure. A process i
8、nfrared spectrometer scans from 400 to4400 wavenumbers of the infrared transmission spectrum ofliquid chlorine. This spectrum then is ratioed to one obtainedfrom the nitrogen-filled infrared cell previously. The ratioedspectrum is converted to absorbance, and the net absorbance ofwater band at 1596
9、wavenumbers, relative to a reference at1663 wavenumbers, is determined.3.2 The amount of water corresponding to this net absor-bance is determined from a calibration curve prepared from theinfrared absorbencies of standards which contain concentra-tions of water in liquid chlorine. These standards a
10、re preparedfrom manual samples of liquid chlorine in tantalum cylinders.Sample from each cylinder is introduced into a calibrationinfrared cell and maintained as a liquid under its own pressure.4. Significance and Use4.1 Trace amounts of water may be detrimental to the use ofchlorine in some applica
11、tions. The amount of water in thechlorine must be known to prevent problems during its use.5. Apparatus5.1 Process Infrared Spectrometer, capable of measure-ments in the 1600 wavenumber region. An FTIR with fourwavenumber resolution is the instrument of choice, but disper-sive instruments also may b
12、e used to achieve similar results.5.2 Special Infrared Calibration Cell (Fig. 1), as used forcalibration. Neither cell size nor pathlength are critical to theanalysis, but sensitivity and limit of detection are dependent onpathlength. The concentration range reported in the Section 1 isachievable wi
13、th a 60-mm pathlength cell constructed with thefollowing: Figs. 2-75.2.1 Hastelloy C and 316 Stainless Steel Stock, suitable formachining,1This test method is under the jurisdiction of ASTM Committee E15 onIndustrial and Specialty Chemicals and is the direct responsibility of SubcommitteeE15.02 on P
14、roduct Standards.Current edition approved April 1, 2008. Published May 2008. Originallyapproved in 1996. Last previous edition approved in 2002 as E 1786 - 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of
15、ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Code of Federal Regulations, available from U.S. Government Printing Office,Washington, DC 20402.4Available from The Chlorine Institute, Inc., 2001 L St. NW, Washington, DC20036-4919.1*A Summary of Cha
16、nges section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2.2 Silver Chloride Windows, 0.5 cm 3 2.5 cm, and5.2.3 Perfluoroelastomer Sheet, 0.762 mm (0.030 in.) thick-ness.5.3 Ball Valves, Monel
17、 6.35 mm (14-in.) valve with pipe and6.35 mm (14-in.) tube ends.FIG. 1 Infrared Cell (Drawing Not to Scale)FIG. 2 Pipe AdapterFIG. 3 Air Cap DetailFIG. 4 Body DetailE17860825.4 Needle Valves, Nickel or Monel 6.35 mm (14-in.) valvewith pipe and 6.35 mm (14-in.) tube ends.5.5 Sample Cylinder Assembly
18、(Fig. 8), consisting of:5.5.1 Sample Cylinder, nickel, Monel, or tantalum, 400 to1000-mL capacity, double-ended, with valves at each end,specially cleaned. Cylinders with both valves at one end andwith a dip tube on one valve have been found to be satisfactory.Another option is to construct special
19、cylinders containing aseptum fitting on one end.NOTE 1A procedure for cleaning cylinders and valves, for use withliquid chlorine, is given in Test Method E 806, Appendix X2 .5.5.2 One Needle and One Ball Valve, nickel body, havingpacking resistant to liquid chlorine. If nickel valves are notavailabl
20、e, 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 nitrogen (lessthan 5 mg/kg (ppm) water vapor).5.5.5 Fittings, for transferring chlorine from one cylinder toanother.5.5.6 One 0 to 10 L Syringe and One 0 to 25 L Syringe,26
21、gage needle.5.5.7 Dewar Flask, of sufficient size to hold a cylindersurrounded by dry ice and methylene chloride. The Dewarflask should be supported by a wooden holder for safetypurposes.5.5.8 Hygrometer, capable of measuring moisture as low as5 mg/kg (ppm) in glove bag or dry box.5.6 Silicone Rubbe
22、r Septa.5.7 Mechanical Shaker.5.8 Drying Oven.5.9 Special Infrared Process Cell (Fig. 9) for on-line analy-sis of water in liquid chlorine. Neither cell size nor path lengthis critical to the analysis, but sensitivity and limit of detectionare dependent on pathlength. The concentration range reporte
23、din the scope is achievable with a 60-mm pathlength cellconstructed with:5.9.1 Hastelloy C and 316 Stainless Steel Stock, suitable formachining.5.9.2 Silver Chloride Windows, two, 25-mm diameter by2-mm thick and two 25-mm diameter by 4-mm thick.5.9.3 Eight Viton O-rings, Size 027.6. Reagents6.1 Puri
24、ty of WaterUnless otherwise indicated, watermeans Type II or III reagent water conforming to SpecificationD 1193.6.2 Chlorine, liquid with less than 5 mg/kg (ppm) water.6.3 Methylene Chloride (CH2Cl2).NOTE 2This reagent is used for cooling purposes only.6.4 Dry Ice (CO2).6.5 Dry Nitrogen (5 mg/kg (p
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