Hach POCKET COLORIMETER II - Chlorine Dioxide Measurement; Chlorine Dioxide Sample Measurement Tips

1—53
Chlorine Dioxide (0.05 to 5.00 mg/L ClO
2
)
Method 10126
For water and wastewater
DPD Method* USEPA accepted for drinking water **
Measuring Hints
• Chlorine dioxide samples cannot be stored, they must be analyzed immediately
after collection to minimize loss of chlorine dioxide.
• Do not use plastic sample containers or measurement apparatus.
• If the chlorine dioxide concentration exceeds the upper limit of the test (5.00 mg/L
ClO
2
), the color will not develop properly. The display will show overrange
(flashing 5.50) when the concentration is 5.50 or more.
If the reading is over 5.00, dilute the sample with high quality water that is
chlorine demand-free and repeat the test. Some loss of chlorine dioxide may occur
during dilution. Multiply the result by the appropriate dilution factor.
* Adapted from Standard Methods for Examination of Water and Wastewater.
** Procedure is equivalent to Standard Methods, 4500 ClO
2
D.