Ozone (Dpd-4); Total Chlorine (Dpd-4); Cl1 - Exact Micro 7+ Manuel D'instructions

DPD-3 Total Chlorine Test Procedure
CL
This procedure is only valid when run as a continuation of the
eXact Strip Micro CL (DPD-1 Free Chlorine ) Test Procedure
®
REMOVE STRIP
8
Remove one (1) eXact
beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately.
DIP STRIP AND PRESS "READ"
9
Dip the eXact
®
starts the 20 SECOND countdown timer. During this time move the strip in a gentle back
and forth motion. Remove and discard the strip when "1" on the display disappears. The
cursor will move across the display while the meter prepares to measure the sample. This
result is automatically stored in CL1 (NOTE: The Iodide added with DPD-3 will, in the presence
of Combined Chlorine or Chloramines, convert into Iodine).
PRESS READ AGAIN
10
Press READ again and the meter will count down and display the next reading. If this
reading matches the previous result, then record this as the Total Chlorine result. This value
is automatically stored in CL1. After testing is completed, rinse cell immediately. Record the
Total Chlorine as the highest value the meter displayed.
*NOTE: Standard Method (4500-Cl G, procedure for total chlorine) requires the reading to
be made after 2 minutes from the time the KI is added. For compliance testing, you must
time the two minutes and then make your measurement. NOTE: From testing in our lab,
water samples above 70°F (20°C), generally, reach a stabilized reading quicker then 2 minutes.
CL1: Chlorine and Iodine react with N,N-diethyl-p-phenylenediamine as it is released from the strip to
form a magenta color, directly proportional to the Chlorine concentration. (Ozone, Bromine, and
Permanganate also form the color)
eXact Strip Micro CL (DPD-1/DPD-3/DPD-4) Interferences (part nos. 486637/486638/486670)
®
Interfering Substance
Acidity
Alkalinity
Bromine & Bromamines, Br
Chlorine Dioxide, ClO
2
Copper, Cu
+2
Iodine, I
2
Manganese, oxidized (Mn
or Chromium, oxidized (Cr
Monochloramines (NH Cl)
2
(applies to DPD-1 only)
Ozone, O
3
Peroxides
pH
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located on the previous page.
Strip Micro CL (DPD-3), Part No. 486638 from the bottle before
®
Strip Micro CL (DPD-3) into the CELL and immediately press READ. This
Interfering Levels & Treatments
If sample has acidity above 150mg/L CaCO
full color. Neutralize to pH 6.0 to 7.0 with 0.5N Sodium hydroxide.
If sample has alkalinity above 200mg/L CaCO
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.
Color development is reduced above 10 ppm (mg/L).
Color similar to free chlorine reaction at all levels.
, Mn ) See AWWA procedure 4500-CL F, 1(d) for removal of interferences.
+4 +7
)
+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).
5

CL1

test may not develop
3
test may not develop
3