Standard Test Method for
Cyanogen Chloride in Water 1

This standard is issued under the fixed designation D 4165; 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 (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This test method covers the determination of cyanogen
chloride in water. Cyanogen chloride is normally present only
at very low concentrations; it is a very labile and sparsely
soluble gaseous compound. Water samples may contain cyanogen chloride after the chlorination of waste waters containing
cyanide or thiocyanate compounds.

1.2 Cyanogen chloride is unstable. A quick test using a spot
plate or comparator as soon as the sample is collected may be
the best test, reducing the loss of cyanogen chloride during the
time lapse between sampling and analysis. (See Fig. 1 for a
typical decay curve for cyanogen chloride in a solution.)

1.3 This test method has been used successfully with
reagent water. The analyst is responsible for determining
whether the test method is applicable to the water matrix being
tested. Reference is made to Test Method D of Test Methods
D 2036 which is based on similar chemical reactions and has
been evaluated by collaborative testing in this matrix.

1.4 The lower limit of detectability is 0.005 mg CN −
/L.

1.5 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 hazard
statements are given in Note 1 and Note 2 and Section 9.

2. Referenced Documents

2.1 ASTM Standards:
D 1129 Terminology Relating to Water2
D 1193 Specification for Reagent Water2
D 2036 Test Methods for Cyanides in Water3
D 3370 Practices for Sampling Water from Closed Conduits2
D 3856 Guide for Good Laboratory Practices in Laboratories Engaged in Sampling and Analysis of Water2
D 4210 Practice for Interlaboratory Quality Control Procedures and a Discussion on Reporting Low-Level Data2

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