LaMotte 1200-CL User manual
1200 COLORIMETER
CHLORINE
DPD TABLET TEST
MODEL 1200-CL ·CODE 3670-01
QUANTITY CONTENTS CODE
100 *Chlorine DPD #1 Instrument Grade Tablets *6903A-J
100 *Chlorine DPD #3 Instrument Grade Tablets *6197A-J
1 Colorimeter Tubes, w/caps,set of 6 0290-6
2 Tablet Crushers 0175
1 Water Sample Collecting Bottle 0688
1 1200 Colorimeter for Chlorine DPD 26728
*WARNING: Reagents marked with an * are considered to be potential health hazards. To view
or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD or
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
To order individual reagents or test kit components, use the specified code number.
INTRODUCTION
Chlorine is added to water to kill bacteria and other disease-producing organisms,
control algae, and remove undesirable odors and colors. Chlorine added to water quickly
forms hypochlorous acid, HClO, also known as Free Available Chlorine, the active
ingredient responsible for chlorine*s sanitizing capabilities. Free Available Chlorine
combines with impurities in the water to form chloramines and other organic nitrogen
compounds. In combined form, its sanitizing capability diminishes, and higher levels of
chlorine are necessary to achieve effective sanitation.
Therefore, it is essential to chlorinate to the point of establishing a Free Available
Chlorine Residual, and then to maintain that residual at a recommended level. The
LaMotte DPD tablet test method distinguishes levels of Free Available Chlorine,
Combined Chlorine, and Total Residual Chlorine, using a single test sample.
CHLORINE TEST PROCEDURE - DPD METHOD
Read the 1200 Colorimeter Manual before proceeding. Carefully
wipe tubes dry before inserting into the colorimeter chamber.
FREE AVAILABLE CHLORINE
7. 8.
5.
3.
1. 2.
4.
6.
I200 COLORIMETER
••••••••••••••••••
READ
READ
ZERO
CAL
••••••••••••••••••
bla
COLORIMETER
I200
Fill the Water
Sample Collecting
Bottle (0688) with
sample water. This
will be used to
dispense sample
water for the tests.
Insert the tube
into the
chamber, being
sure to align the
index line with
the arrow on
the meter.
Close the lid.
This tube is the
blankorzero.
Empty all but a few
drops of sample from
tube. Add one
*Chlorine DPD #1
IG Tablet (6903A) and
crush with tablet
crusher (0175).
NOTE: To insure
accurate results, tablet
must be crushed before
filling tube.
Align the index line with the
arrow on the meter, insert tube
into chamber.
the lid. Push the
READ button.
Record results as
ppm Free Available
Chlorine. Save
sample for the Total
Residual Chlorine
test.
Rinse and fill a
colorimeter tube
(0290) to the
10 mL line with
sample water.
Cap and wipe
dry.
Push the READ
button to turn the
meter on. Press the
ZERO button and
hold it for 2 seconds
until is displayed.
bla
Release the button to
take a zero reading
(0.00 ppm).
Fill to 10 mL line
with sample. Cap
and mix until tablet
disintegrates. Make
readings within 30
seconds after
disintegration of the
tablet.
Add one Chlorine
DPD #3 IG Tablet
(6197A) to the sample
from Step 6. Crush
tablet.
READ
er2
TOTAL RESIDUAL CHLORINE
If either chlorine reading displays , repeat procedure on diluted sample, and
multiply the result by the appropriate dilution factor. See 1200 Colorimeter Instruction
Manual for procedure.
Levels of chlorine above 10 mg/L will cause a bleaching effect on the DPD indicator, and
may give a false indication that no chlorine is present. If it is possible that the chlorine
concentration is greater than 10 mg/L (e.g. after shock treatment), perform test on a
diluted sample and multiply the result by appropriate dilution factor.
CAUTION: DO NOT leave reacted DPD samples in test tubes. Discard sample and
thoroughly rinse tubes. If allowed to remain, DPD will stain tubes, significantly
impairing the operation of the 1200 Colorimeter. If necessary, acid wash, and vigorously
clean glassware with test tube brush and detergent.
**For wastewater samples, Standard Methods for the Examination of Water and Wastewater
recommends waiting 2 minutes for full color development.
11 .
9. 10.
12.
••••••••••••••••••
READ
2.55
ZERO
COLORIMETER
I200
Cap and mix
until tablet
disintegrates.**
Push the
READ button.
Record reading
as ppm Total
Residual
Chlorine.
Insert the tube
into the
chamber, being
sure to align the
index line with
the arrow on
the meter.
Close the lid.
Subtract the Free Available
Chlorine reading from the
Total Residual Chlorine
reading to determine ppm
Combined Chlorine
(Monochloramine,
Dichloramine, and Nitrogen
Trichloride) present in the
water sample.
DPD CHLORINE
TEST METHOD SPECIFICATIONS
APPLICATION
Drinking water supplies and distribution systems, swimming pool and spas, sewage and
chlorinated waste waters, process waters and sanitizing solutions.
RANGE
0 to 4.0 mg/L Chlorine (may be extended by dilution)
METHOD
In the absence of Iodide, Free Available Chlorine reacts instantly with the buffered
diethyl-p-phenylenediamine indicator (DPD) to produce a red color in proportion to the
amount of chlorine present. Subsequent addition of potassium iodide produces a rapid
color response from the combined forms of chlorine (chloramines).
HANDLING & PRESERVATION
Chlorine in aqueous solutions, particularly weak solutions, is not stable. Exposure to
sunlight or agitation will accelerate the reduction of chlorine. Fill sample containers to
the top and cap tightly. Analyze samples as soon as possible after collection.
INTERFERENCES
The only interfering substance likely to be encountered 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 amount of interference can be measured.
CALIBRATION
The single test colorimeter is precalibrated. In order to comply with NPDWR or NPDES
reporting regulations, the calibration should be checked periodically by using a set of
reference standards including a 0 mg/L blank and 0.3, 1.0, and 3.5 mg/L chlorine. To
prepare these standards, a LaMotte 1000 mg/L standard chlorine equivalent solution
(Code 3858) is available. Consult with your local regulatory agency to determine
standardization frequency.
LaMOTTE COMPANY
Helping People Solve Analytical ChallengesSM
PO Box 329 • Chestertown • Maryland • 21620 • USA
800-344-3100 • 410-778-3100 (Outside USA) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
63670-01 ·7/08
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