LaMotte SMART Spectro Spectrophotometer - Manual (Page 168)

HYDROGEN PEROXIDE, SHOCK
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 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.
Large quantities of hydrogen peroxide shock 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 shock can be used to shock biguanide pools.
APPLICATION: Swimming pools
RANGE: 0–225 ppm Hydrogen Peroxide Shock
MDL: 4 ppm
METHOD: Hydrogen peroxide shock 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 shock 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 2.11 HYDROGEN PEROXIDE, Shock
Test P
rocedures