LaMotte CHLORINE IN DRINKING WATER TEST KIT SL-MW 3312 - Manual (Page 2)

EPA AC CEPTED PROCEDURE
This test is EPA Accepted for NIPDWR monitoring. For compliance
monitoring a Check Standard should be prepared.
CHECK STANDARD PREP A RA TION: 1 ppm Equiv a lent Solution
1.
Dissolve 891 mg of potassium permanganate in 1000 mL of distilled
water in a volumetric flask (1000 ppm equivalent solution).
2. Dilute 1 mL of this solution to 1000 mL with distilled water in a
volumetric flask. This solution is equivalent to 1 ppm Free Available
Chlorine.
PRO CE DURE
FREE AVAILABLE CHLORINE
1.
Fill a test tube (0106) to the 5 mL line with the sample water.
2. Add one *Chlorine DPD #1R Tablet (6999A). Cap tube and mix
until tablet disintegrates.
3. Insert test tube into the top of the Octa-Slide Viewer. Slide the
Chlorine Octa-Slide Bar (3405) into the viewer. Match sample color
to a color standard.
4. Record as ppm Free Available Chlorine. Retain this sample if Total
and Combined Chlorine are to be determined.
TOTAL RE SID UAL & COMBINED CHLORINE
5.
Add one *Chlorine DPD #3 Tablet (6905A) to the test sample from
Step 4 above. Cap tube and mix until tablet dissolves.
6. Insert test tube into the Octa-Slide Viewer. Match sample color to a
color standard.
7. Record as ppm Total Residual Chlorine.
8. To obtain reading in ppm Combined Chlorine, subtract Free
Available Chlorine from Total Residual Chlorine.
Combined Chlorine, ppm =
Total Residual Chlorine
_
Free Available Chlorine
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