Exact ® Strip Micro Cl Interferences - eXact Pool EZ Quick Start Manual

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eXact Strip Micro CL (DPD-1, DPD-3, DPD-4) Interferences
®
Interfering
Substance
Acidity
Alkalinity
Bromine &
Bromamines, Br
Chlorine Dioxide, ClO
Copper, Cu
+2
Iodine, I
2
Manganese, Oxidized
(Mn , Mn ) or
+4 +6
Chromium,
Oxidized (Cr
Monochloramines
(NH Cl)
2
(applies to DPD-1 only)
Ozone, O
3
Peroxides
pH
FILL, DIP, READ
COMBINED CHLORINE
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.
Interfering Levels & Treatments
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.
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.
Color similar to free chlorine reaction at all levels.
2
Color similar to free chlorine reaction at all levels.
2
Color development is reduced above 10
ppm (mg/L).
Color similar to free chlorine reaction at all levels.
See AWWA procedure 4500-CL F, 1(d) for
removal of interferences.
)
+6
Monochloramine interferences are known
to occur in free chlorine
DPD methods. This interference is
dependent on temperature and
monochloramine concentration.
Color similar to free chlorine reaction at all levels.
Interference is possible.
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).
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