LaMotte CHLORINE pH KIT OCTA-SLIDE 2 - Manual (Page 3)

PROCEDURE 2: FREE AVAILABLE CHLORINE, COMBINED
CHLORINE & TOTAL RESIDUAL CHLORINE
FREE AVAILABLE CHLORINE
1. Follow Steps 1 through 5 under Procedure 1. This is Reading A. Retain the test
sample for the Combined Chlorine determination.
COMBINED CHLORINE & TOTAL RESIDUAL CHLORINE
2. To the test sample from Step 1 above, add one *Chlorine DPD #3R Tablet
(6905A). Cap and mix until tablet disintegrates.
3. Insert the Chlorine Octa-Slide 2 Bar 0.1-1.0 ppm (3405-01) or Chlorine Octa-
Slide 2 Bar 1.0-6.0 ppm (3404-01) into the Octa-Slide 2 Viewer (1101).
4. Insert the test tube into the Chlorine DPD Comparator, 0.1-1.0 ppm (6978) or the
Chlorine DPD Comparator, 1.0-6.0 ppm (6979). Match sample color to a color
standard. Record as Reading C. Any increase in color over Reading A is due to
Combined Chlorine (Monochloramine plus Dichloramine).
Reading C - Reading A = Combined Chlorine (ppm)
5. Reading C also represents the Total Residual Chlorine content.
PROCEDURE 3: TOTAL RESIDUAL CHLORINE
The *Chlorine DPD #4R Tablet provides a one-step determination for total residual
chlorine and is used where it is not necessary to distinguish the separate chlorine fractions.
1. Rinse the test tube (0898) with sample water. Fill to the bottom line with sample
water.
2. Add one *Chlorine DPD #4R Tablet (6899A). Crush tablet with tablet crusher
(0175). Cap and mix until tablet disintegrates.
3. Insert the test tube into the Chlorine DPD Comparator, 0.1-1.0 ppm (6978) or the
Chlorine DPD Comparator, 1.0-6.0 ppm (6979). Match sample color to a color
standard. Record as ppm Total Residual Chlorine.
PROCEDURE 4: BROMINE & IODINE
Bromine and iodine may be determined by following the free available chlorine test
procedure and multiplying the comparator reading by the factors given below.
1. Follow Steps 1 through 5 under Procedure 1.
2. To determine parts per million Bromine, multiply the comparator reading from
Step 1 by 2.2.
ppm Free Available Chlorine x 2.2 = ppm Bromine
3. To determine parts per million Iodine, multiply the comparator reading from Step
1 by 3.5. ppm
Free Available Chlorine x 3.5 = ppm Iodine