ASTM E1786-17

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. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E1786 − 08 E1786 − 17
Standard Test Method for
Determination of Low Levels of Water in Liquid Chlorine by
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On-Line Infrared Spectrophotometry
This standard is issued under the fixed designation E1786; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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 in liquid chlorine in the concentration
range 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 Material Safety Data Sheets (MSDS)(SDS) for detailed information concerning toxicity, first aid
procedures, and safety precautions.
1.4 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 appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use. Specific hazards statements are given in Section 7 and Note 3.
2. Referenced Documents
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2.1 ASTM Standards:
D1193 Specification for Reagent Water
E806 Test Method for Carbon Tetrachloride and Chloroform in Liquid Chlorine by Direct Injection (Gas Chromatographic
Procedure)
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2.2 Federal Standards:
49 CFR 173 Code of Federal Regulations Title 49 Transportation: Shippers’Shippers’ General Requirements for Shipments and
Packaging, including the following sections:
173.304 Charging of Cylinders with Liquefied Compressed Gas
173.314 Requirements for Compressed Gases in Tank Cars
173.315 Compressed Gases in Cargo Tanks and Portable Tank Containers
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2.3 Other Document:
Chlorine Institute Pamphlet No. 771 —Sampling Liquid Chlorine— Chlorine Basics
3. Summary of Test Method
3.1 Liquid chlorine continuously 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.
This spectrum then is ratioed to one obtained from the nitrogen-filled infrared cell previously. The ratioed spectrum is converted
to absorbance, and the net absorbance of water band at 1596 wavenumbers, relative to a reference at 1663 wavenumbers, is
determined.
3.2 The amount of water corresponding to this net absorbance is determined from a calibration curve prepared from the infrared
absorbencies of standards which contain concentrations of water in liquid chlorine. These standards are prepared from manual
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This test method is under the jurisdiction of ASTM Committee D16 on Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of Subcommittee
D16.16 on Industrial and Specialty Product Standards.
Current edition approved April 1, 2008March 1, 2017. Published May 2008March 2017. Originally approved in 1996. Last previous edition approved in 20022008 as
E1786 – 02.E1786 – 08. DOI: 10.1520/E1786-08.10.1520/E1786-17.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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Code of Federal Regulations, availableAvailable from U.S. Government Printing Office, Washington, DC 20402.Superintendent of Documents, 732 N. Capitol St., NW,
Washington, DC 20401-0001, http://www.access.gpo.gov.
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Available from The Chlorine Institute, Inc., 2001 L St. NW, Washington, DC 20036-4919.1300 Wilson Blvd., Suite 525, Arlington, VA 22209, https://
www.chlorineinstitute.org.
*A Summary of Changes 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
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E1786 − 17
samples of liquid chlorine in tantalum cylinders. Sample from each cylinder is introduced into a calibration infrared cell and
maintained as a liquid under its own pressure.
4. Significance and Use
4.1 Trace amounts of water may be detrimental to the use of chlorine in some applications. The amount of water in the chlorine
must be known to prevent problems during its use.
5. Apparatus
5.1 Process Infrared Spectrometer, capable of mea
...