MIOX RIO Series Operators Manual
P/N: 102-00076-G Page 71
2. Determine the volume of oxidant and sample water to be used based on X:
mL of Oxidant = 100 / X = 100 / 50 = 2 mL
mL of Sample Water = 100 - (100 / X) = 100 -(100 / 50) = 100 - 2 = 98 mL
Thus, add 2 mL of oxidants to 98 mL of sample water for the first FAC reading
3. Determine the doses for subsequent measurements.
Dilute the oxidant as determined above and after 30 minutes, take an FAC reading. If FAC is
unmeasurable, all of the oxidants have been consumed and you need doses of 10, 15, and
20 ppm for subsequent testing; otherwise if FAC has not significantly diminished, use 1, 3,
and 5 ppm doses for subsequent testing. In this case, assume that the reading was 2.5 ppm
after 30 minutes, indicating you should use test doses of 1, 3, and 5 ppm.
Setup Calculations
Use the formulas given above to determine the amount of oxidant and sample water to use
(based on 100 mL samples) for each of the doses. The sum of your oxidant and sample
water volumes should add up to 100 mL since it provides enough volume for multiple FAC
measurements at the various testing times.
Example:
Determine the oxidant and sample water volumes for the 1, 3, and 5 ppm doses. Given
that MIOX OSG is still generating an oxidant concentration of 250 ppm.
1 ppm
3ppm 5ppm
Dilution Factor (X) 250/1 = 250 250/3 = 83.3 250/5 = 50
mL of Oxidant 100/250 = 0.4 100/83.3 = 1.2 100/50 = 2
mL of Sample Water 100-0.4 = 99.6 100-1.2 = 98.8 100-2 = 98
For a 1 ppm dose, 0.4 mL of oxidant should be mixed with 99.6 mL of sample water. For a
3 ppm dose, 1.2 mL of oxidant should be mixed with 98.8 mL of sample water For a 5
ppm dose, 2.0 mL of oxidant should be mixed with 98 mL of sample water
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