YSI 9300 Photometer - Manual (Page 67)

PHOTOMETER TEST INSTRUCTIONS
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Hydrogen peroxide is used in various water treatment processes. In such applications
it is important to ensure that the hydrogen peroxide level is maintained within the
correct range to ensure optimum operation of the water treatment process.
The YSI Hydrogen Peroxide LR test provides a simple means of measuring
Hydrogen Peroxide levels over the range 0 - 2.0 mg/l.
Method
Hydrogen peroxide reacts with potassium iodide under slightly acid conditions,
and in the presence of a catalyst, to release iodine into solution. The iodine then
reacts with diethyl-p-phenylene diamine (DPD) to produce a pink coloration. In
the YSI method the reagents are combined in the form of a single tablet and the
test is simply carried out by adding a tablet to a sample of the water.
The intensity of the color produced is proportional to the hydrogen peroxide
concentration and is measured using a YSI Photometer.
Reagents and Equipment
YSI Hydrogen Peroxide LR Tablets
YSI 9300 or 9500 Photometer
Round Test Tubes, 10 ml glass (PT 595)
Photometer Method
AUTOMATIC
WAVELENGTH
SELECTION
0 – 2.0 mg/l
PHOT.16.AUTO