LaMotte CHLORINE TEST KIT LP-26 - Manual (Page 2)

EPA AC CEPTED PROCEDURE
EPA Accepted for NPDWR compliance monitoring.
For compliance
monitoring a Check Standard should be prepared. A fresh solution
should be prepared daily.
CHECK STANDARD PREP A RA TION: 1 ppm equiv a lent so lu tion
1.
Place 891 mg potassium permanganate in a 1 liter volumetric flask.
Dilute to 1 liter with distilled or deionized water. This is the stock
solution.
NOTE:
This stock solution should be prepared fresh daily.
2. Transfer 1 mL to a 1 liter volumetric flask. Dilute to 1 liter with
distilled or deionized water. This solution is equivalent to 1 ppm
Free Available Chlorine.
PRO CE DURE
FREE AVAIL ABLE CHLO RINE
1.
Rinse a test tube with sample water. Fill to 5 mL line with the
sample water.
2. Add one *Chlorine DPD #1R Tablet (6999A). Cap and shake until
tablet disintegrates.
3. Immediately insert test tube into Chlorine DPD Comparator
(6902). Match sample color to a color standard. Record as ppm
Free Available Chlorine.
NOTE:
Save sample for total residual and combined chlorine tests.
TO TAL RE SID UAL CHLO RINE & COM BINED CHLO RINE
4.
Add one *Chlorine DPD #3R Tablet (6905A) to the sample from
Step 3. Cap and shake until tablet disintegrates.
5. Insert test tube into Chlorine DPD Comparator (6902). Match
sample color to a color standard. Record as ppm Total Residual
Chlorine.
6. Subtract Free Available Chlorine from Total Residual Chlorine.
Record as ppm Combined Chlorine.
Combined Chlorine, ppm =
Total Residual Chlorine - Free Available Chlorine
NOTE: Thoroughly clean and rinse test tubes after each test.
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