LaMotte SMART Spectro Spectrophotometer - Manual (Page 164)

HYDROGEN PEROXIDE, LOW RANGE
DPD METHOD • CODE 3662-SC
QUANTITY CONTENTS CODE
30 mL *Hydrogen Peroxide Reagent #1 *6452-G
100 *Hydrogen Peroxide LR Tablets *6454A-J
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.
Hydrogen peroxide, H
2
O
2
, is a colorless compound that is widely used as a
bleaching or decolorizing agent in the manufacture of many commercial products.
As an oxidizing compound it is also used in the treatment of sewage to reduce
odors and corrosion due to hydrogen sulfi de. It may also be used as a sanitizing
agent for water treatment. Hydrogen peroxide is relatively unstable, and for this
reason it dissipates quickly and leaves no residuals.
APPLICATION: Drinking and surface waters; domestic and industrial
wastes.
RANGE: 0.00–1.50 ppm Hydrogen Peroxide
MDL: 0.02 ppm
METHOD: Hydrogen peroxide reacts with an excess of potassium
iodide through the action of a catalyst and buffer to
release an equivalent amount of iodine. The iodine in
turn reacts with diethyl-p-phenylenediamine (DPD) to
produce a pink-red color in proportion to the iodine
released.
SAMPLE HANDLING
& PRESERVATION:
Hydrogen peroxide is not stable in aqueous solutions.
Exposure to sunlight and agitation will accelerate the
reduction of hydrogen peroxide in dilute solutions. For
best results start analysis immediately after sampling.
INTERFERENCE: The likelihood of other oxidizing compounds interfering
with this method is eliminated by the presence of
hydrogen peroxide. Manganese may interfere and
should be removed before analysis.
SMART Spectro Test Procedures 2.11 HYDROGEN PEROXIDE, Low Range
Test P
rocedures