DR/2400
Iodine
Iodine_AVPP_Other_DPD_Eng_Ody.fm Page 1 of 4
• Analyze samples immediately. Do not preserve for later analysis.
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust
. See the
instrument manual for more information on Running a Reagent Blank.
• If the sample temporarily turns yellow after reagent addition, dilute a fresh sample. Repeat the test. A slight loss of iodine may
occur due to the dilution. Apply the appropriate dilution factor. See Section 2.7 Sample Dilution on page 21.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
Iodine
Method 8031
DPD Method*
* Adapted from Palin, A.T., Inst. Water Eng., 21 (6), 537-547 (1967).
Powder Pillows or AccuVac
®
Ampuls
(0.07 to 7.00 mg/L)
Scope and Application: For testing dissolved iodine residual used as disinfectant in process water,
treated water, estuary water, and seawater
1. Touch
Hach Programs.
Select program
240 Iodine.
Touch
Start.
2. Fill a cell with 10 mL
of sample.
3. Add the contents of
one DPD Total Chlorine
Powder Pillow to the
sample cell (this is the
prepared sample).
Swirl to mix.
A pink color will develop
if iodine is present.
4. Touch the timer icon.
Touch
OK.
A three-minute reaction
period will begin.
Tips and Techniques
Powder Pillows Method 8031
Hach Programs
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