LaMotte CHLORINE - pH TEST KIT LP-8 - Manual (Page 3)

PRO CE DURE 2:
FREE AVAIL ABLE CHLO RINE, COM BINED CHLO RINE
& TO TAL RE SID UAL CHLO RINE
FREE AVAILABLE CHLORINE
1.
Follow Steps 1 through 4 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). 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 Reading C. Any
increase in color over Reading A is due to Combined Chlorine
(Monochloramine plus Dichloramine).
Reading C - Reading A = Combined Chlorine (ppm)
4. Reading C also represents the Total Residual Chlorine content.
PRO CE DURE 3:
TO TAL RE SID UAL CHLO RINE
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.