Test Procedures
APPLICATION:
Drinking, surface, and saline waters; swimming pool water;
domestic and industrial wastes.
RANGE:
0.00–4.00 ppm Chlorine
MDL:
0.025 ppm
METHOD:
In the absence of iodide, free available chlorine reacts instantly
with DPD to produce a red color. Subsequent addition of
potassium iodide evokes a rapid color response from the
combined forms of chlorine (chloramines).
SAMPLE HANDLING &
PRESERVATION:
Chlorine in aqueous solutions is not stable, and the chlorine
content of samples or solutions, particularly weak solutions,
will rapidly decrease. Exposure to sunlight or agitation will
accelerate the reduction of chlorine present in such solutions.
For best results, start analysis immediately after sampling.
Samples to be analyzed for chlorine cannot be preserved or
stored.
INTERFERENCE:
The only interfering substance likely to be encountered in water
is oxidized manganese. The extent of this interference can
be determined by treating a sample with sodium arsenite to
destroy the chlorine present so that the degree of interference
can be measured.
Iodine and bromine can give a positive interference, but these
are not normally present unless they have been added as
sanitizers.
CHLORINE,
LIQUID
SMART Spectro 2 Test Procedures 05.02.16
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