LaMotte SMART Spectro Spectrophotometer - Manual (Page 146)

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 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.
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 sulfide. 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
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 4.08 Hydrogen Peroxide–LR 1/2