LaMotte SMART Spectro Spectrophotometer - Manual (Page 108)

CHLORINE DIOXIDE
DPD METHOD • CODE 3644-SC
QUANTITY CONTENTS CODE
100 *DPD #1 Instrument Grade Tablets *6903A-J
15 mL Glycine Solution 6811-E
1 Tablet Crusher 0175
*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents
go to 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
MDL: 0.04 ppm
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.
SMART Spectro Test Procedures 2.11 CHLORINE DIOXIDE
Test P
rocedures