LaMotte HYDROGEN PEROXIDE & PERACETIC ACID KIT Drop Count - Manual (Page 2)

PERACETIC ACID
NOTE: This method may be used to test low to high concentration of peracetic acid.
Choose the procedure that is most appropriate for the sample being tested.
1 drop = 15 ppm
1. Fill test tube (0715) to 10 mL line with sample water.
2. Add 10 drops of *Sulfuric Acid, 1:1 (6141WT). Swirl to mix. Make sure solution
is thoroughly mixed.
3. Add 1 drop of Ferroin Indicator (6410). Swirl to mix. Make sure solution is
thoroughly mixed.
4. Add 1 drop of *Potassium Iodide 20% Solution (6521). Swirl to mix. Make sure
solution is thorougly mixed. Solution will turn a cloudy brown if peracetic acid is
present.
5. While gently swirling tube, add Peracetic Acid Titrant (S-6155), one drop at a
time until brown color changes to a clear, pale orange-pink which persists for
20 seconds. Make sure solution is thoroughly mixed. Count the number of drops
added.
6. Multiply the number of drops used in Step 5 by 15 (fi fteen). Record as ppm
Peracetic Acid.
For example:
10 drops x 15 = 150 ppm Peracetic Acid
Low Range (20-90 ppm) 1 drop = 6ppm
Fill the test tube to the 25 mL line. Follow the test procedure and use 25 drops of
*Sulfuric Acid, 1:1 (6141WT), 3 drops of Ferroin Indicator (6410) and 3 drops of
*Potassium Iodide 20% Solution (6521). In Step 6 multiply the number of drops used
by 6 (six). Record as ppm Peracetic Acid.
For example:
10 drops x 6 = 60 ppm Peracetic Acid
High Range (300-500 ppm) 1 drop = 300 ppm
For higher concentrations of peracetic acid use the 0.5 mL pipet (0353) to add 0.5 mL
of the sample to the test tube (0715). Fill the tube to the 10 mL line with hydrogen
peroxide/peracetic acid-free water. Follow Steps 2 - 5. In Step 6 multiply the number
of drops used by 300 (three hundred). Record as ppm Peracetic Acid
For example:
10 drops X 300 = 3000 ppm Peracetic Acid
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