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Iodine
Sample Collection, Storage and Preservation
Method Performance
Summary of Method
Required Reagents
Description
DPD Total Chlorine Reagent Powder Pillows...................................... 1 pillow........... 100/pkg.............21056-69
or
DPD Total Chlorine Reagent AccuVac
Required Apparatus
Beaker, 50-mL ............................................................................................ 1 ....................... each.................... 500-41H
Sample Cells, 10-mL, w/cap................................................................... 2 ....................... 6/pkg.................24276-06
FOR TECHNICAL ASSISTANCE, PRICE INFORMATION AND ORDERING:
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© Hach Company, 2003. All rights reserved. Printed in the U.S.A.
Page 4 of 4
Collect samples in clean, dry glass containers. If sampling from a tap, allow the
water to flow at least 5 minutes to ensure a representative sample. Avoid
excessive agitation and exposure to sunlight when sampling. Allow several
volumes of water to overflow the container and cap the container so there is not
headspace above the sample. If sampling with a sample cell, rinse the cell several
times with the sample, then carefully fill to the 10-mL mark. Proceed with the
analysis immediately.
Precision
Standard: 3.83 mg/L I
2
Program
240
242
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
Program
240
242
See Section 3.4.5 Sensitivity on page 44 for more information.
Iodine reacts with DPD (N, N-diethyl-p-phenylenediamine) to form a pink color,
the intensity of which is proportional to the total iodine concentration. Test
results are measured at 530 nm.
®
Ampuls................................. 1 ampul........... 25/pkg...............25030-25
Call
toll-free
800-227-4224
Contact the HACH office or distributor serving you.
www.hach.com
; E-mail –
techhelp@hach.com
95% Confidence Limits of Distribution
3.76–3.90 mg/L I
3.69–3.97 mg/L I
Portion of Curve
Entire range
Entire range
Quantity Required
per test
2
2
∆Abs
∆Concentration
0.010
0.07 mg/L I
0.010
0.07 mg/L I
Unit
HACH COMPANY
WORLD HEADQUARTERS
Telephone: (970) 669-3050
FAX: (970) 669-2932
Iodine_AVPP_Other_DPD_Eng_Ody.fm
2
2
Cat. No.
3/04 1ed
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