Chlorine dioxide – LaMotte SMART Spectro Spectrophotometer User Manual
Page 86
CHLORINE DIOXIDE
DPD METHOD • CODE 3644-SC
QUANTITY
CONTENTS
CODE
100
* Chlorine DPD #1 Instrument Grade Tablets
*6903A-J
15 mL
Glycine Solution
6811-E
1
Tablet Crusher
0175
*WARNING: Reagents marked with a * are considered to be potential health hazards. To view
or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD or
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
Chlorine dioxide is used as a substitute for and an adjunct to chlorine in water
treatment. It is better than chlorine in eliminating taste and odor in certain
cases. Chlorine dioxide, unlike chlorine, does not produce carcinogenic
chlorinated organic compounds when reacted with organic materials. A
disadvantage is the higher cost of producing chlorine dioxide compared to
chlorine.
APPLICATION:
Drinking water; swimming pool water; domestic and
industrial wastewater; food sanitation.
RANGE:
0.00–7.00 ppm Chlorine Dioxide
METHOD:
Chlorine dioxide reacts with DPD to form a red color in
proportion to the concentration.
SAMPLE
HANDLING &
PRESERVATION:
Test as soon as possible to avoid loss of chlorine dioxide.
INTERFERENCE:
Chlorine interference can be removed with the use of
glycine. Very high levels of chloramines may interfere if the
test result is not read immediately. Oxidized manganses
interferes but can be removed with arsenite. Bromine and
iodine interfere. Chromate interference can be removed
with a thioacetamide blank correction.
PROCEDURE
Use universal sample holder.
1.
Press and hold
ON button until spectrophotometer turns on.
2.
Scroll to and select PROGRAMMED TESTS from menu.
3.
Scroll to and select ALL TESTS (or another sequence containing
20 CHLOR DIOX
) from TESTING MENU.
4.
Scroll to and select 20 CHLOR DIOX from menu.
5.
Rinse a clean tube (0290) with sample water. Fill to 10 mL line with
sample.
6.
Insert tube into chamber, close lid and select SCAN BLANK.
7.
Remove tube from Spectro. Pour out all but a sufficient amount of sample
water to cover tablet. Add 5 drops of Glycine Solution (6811).
SMART SPECTRO TEST PROCEDURES 05.04
Chlorine Dioxide 1/2