Hach DR2400 Manual page 194

Chlorine, Total
Accuracy Check
Summary of Method
Required Reagents
Description
DPD Total Chlorine Reagent Powder Pillows...................................... 1 pillow........... 100/pkg.............14064-99
Required Apparatus
Adapter, multi-pathlength cell ............................................................... 1 ....................... each....................59466-00
Cell, sample, multi-pathlength ............................................................... 2 ....................... 6/pkg.................59405-06
Required Standards
Chlorine Standard Solution, PourRite
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Page 4 of 4
Standard Additions Method (Sample Spike)
1. After reading test results, leave the sample cell (unspiked sample) in the
instrument.
2. Touch . Touch
Options
average chlorine concentration shown on the certificate enclosed with the
chlorine voluette ampules. Touch
3. A summary of the Standard Additions procedure will appear. Touch
accept the values for standard concentration, sample volume, and spike
volumes as shown. Touch
accepted, the unspiked sample reading will appear in the top row. See
Standard Additions in the instrument manual for more information.
4. Snap the neck off a HR Chlorine PourRite Ampule Standard.
5. Prepare three sample spikes. Fill three mixing cylinders (Cat. No. 1896-40)
with 5-mL of sample. Using the TenSette
0.3 mL of standard, respectively, to each sample and mix thoroughly.
6. Analyze the standard addition as described in the procedure above. Accept
the standard addition by touching
See Section 3.2.2 Standard Additions for more information.
The range of analysis using the DPD method for free chlorine can be extended by
adding more indicator in proportion to sample volume. Thus, a larger fill
powder pillow of DPD Free Chlorine Reagent is added to a 5-mL sample
portion.
The combined chlorine oxidizes iodide in the reagent to iodine. The iodine reacts
with DPD (N, N-diethyl-p-phenylenediamine) along with free chlorine present
in the sample to form a red color which is proportional to the total chlorine
concentration. To determine the concentration of combined chlorine, run free
chlorine and total chlorine tests. Subtract the results of the free chlorine test from
the results of the total chlorine test to obtain combined chlorine.
®
Ampules, 50–75 mg/L.................................. 20/pkg...............14268-20
Call toll-free 800-227-4224
Contact the HACH office or distributor serving you.
www.hach.com ; E-mail – techhelp@hach.com
. A keypad will appear. Enter the
Standard Additions
.
OK
to change these values. After values are
Edit
®
Pipet, add 0.1 mL, 0.2 mL and
.
Read
Quantity Required
Per Test
to
OK
Unit Cat. No.
HACH COMPANY
WORLD HEADQUARTERS
Telephone: (970) 669-3050
FAX: (970) 669-2932
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ChlorineTot_MP_High_DPD_Eng_2400.fm