LaMotte SMART Spectro Spectrophotometer - Manual (Page 148)

HYDROGEN PEROXIDE–
HIGH RANGE
DPD Method • CODE 4045
QUANTITY CONTENTS CODE
30 mL *Hydrogen Peroxide Reagent #1 *6452-G
100 *Hydrogen Peroxide LR Tablets *6454A-J
1 Tablet Crusher 0175
1 Pipet, glass 0342
*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.
Large quantities of hydrogen peroxide are added to a swimming pool to “shock”
it. Shocking breaks down waste products and re-establishes a positive level of
sanitizer. While many types of shock can be used with chlorine or bromine
pools, only hydrogen peroxide can be used to shock biguanide pools.
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, industrial, domestic and swimming pool waters
RANGE: 0–60 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.
INTERFERENCES: 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 04.08 Hydrogen Peroxide–HR 1/2