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ASTM D 1253 Document Information:
Title
Standard Test Method for Residual Chlorine in Water
ASTM International
Publication Date:
Jun 10, 2003
Scope:
This test method covers the determination of residual chlorine in
water by direct amperometric
titration.
Within the constraints specified in Section 6, this test method is not
subject to commonly
encountered interferences and is applicable to most waters. Some
waters, however, can exert an
iodine demand, usually because of organic material, making less iodine
available for measurement by
this test method. Thus, it is possible to obtain falsely low chlorine
readings, even though the
test method is working properly, without the user's knowledge.
Precision data for this test method were obtained on estuary, inland
main stem river, fresh lake,
open ocean, and fresh cooling tower blowdown water. Bias data could
not be determined because of
the instability of solutions of chlorine in water. It is the user's
responsibility to ensure the
validity of the test method for untested types of water.
In the testing by which this standard was validated, the direct and
back starch-iodide titrations
and the amperometric back titration, formerly part of this standard,
were found to be unworkable
and were discontinued in 1986. Historical information is presented in
Appendix X1.
NOTE 1 - Orthotolidine test methods have been omitted because of poor
precision and accuracy.
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.
Keywords:
- amperometric
- analysis
- chlorine
- water
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