LaMotte SMART Spectro Spectrophotometer - Manual (Page 150)

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 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 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
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 04.08 Hydrogen Peroxide–Shock 1/2