eXact Pool EZ - Exact Strip Micro CL Interferences

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COMBINED CHLORINE
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READ RESULTS
READ result displayed as Combined Chlorine. This
result is automatically stored in the CL3 menu. After
testing is complete, rinse the sample cell immediately.
eXact
®
Strip Micro CL (DPD-1, DPD-3, DPD-4) Interferences
Interfering
Substance
Interfering Levels & Treatments
Acidity If sample has acidity above 150mg/L CaCO3
test may not develop full color. Neutralize to
pH 6.0 to 7.0 with 0.5N Sodium hydroxide.
Alkalinity If sample has alkalinity above 200mg/L
CaCO3 test may not develop full color.
Neutralize to pH 6.0 to 7.0 with 0.5N
Sulfuric acid.
Bromine &
Bromamines, Br
2
Color similar to free chlorine reaction at all levels.
Chlorine Dioxide, ClO
2
Color similar to free chlorine reaction at all levels.
Copper, Cu
+2
Color development is reduced above 10
ppm (mg/L).
Iodine, I
2
Color similar to free chlorine reaction at all levels.
Manganese, Oxidized
(Mn
+4
, Mn
+6
) or
Chromium,
Oxidized (Cr
+6
)
See AWWA procedure 4500-CL F, 1(d) for
removal of interferences.
Monochloramines
(NH
2
Cl)
(applies to DPD-1 only)
Monochloramine interferences are known
to occur in free chlorine
DPD methods. This interference is
dependent on temperature and
monochloramine concentration.
Ozone, O
3
Color similar to free chlorine reaction at all levels.
Peroxides Interference is possible.
pH Typical pH samples of potable water with
a pH of 6.0 to 9.0 are OK. If outside this
range adjust to pH 6.0 to 7.0 using acid
(0.5N Sulfuric acid) or base (0.5N Sodium
hydroxide).
FILL, DIP, READ