YSI 9300 Photometer - Manual (Page 112)

PHOTOMETER TEST INSTRUCTIONS
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Nitrites and nitrite-based formulations are widely used for corrosion control in
cooling water systems. The YSI Nitriphot test provides a simple means of
measuring nitrite for the control of such treatment products in cooling water.
The test covers the range 0 – 1500 mg/I NaNO
2
.
Method
The YSI Nitriphot method is based on a colorimetric procedure using an iodide
containing reagent system. Nitrites catalyse the oxidation of the iodide to iodine
under mildly acid conditions to produce a brown coloration. Over the range of
the test a series of colors from colorless through yellow to brown are produced.
The intensity of the color produced in the test is proportional to the nitrite
concentration and is measured using a YSI Photometer.
Reagents and Equipment
YSI Nitriphot No 1 Tablets
YSI Nitriphot No 2 Tablets
YSI 9300 or 9500 Photometer
Round Test Tubes, 10 ml glass (PT 595)
Measuring Syringe, 1 ml (PT 361)
Photometer Method
AUTOMATIC
WAVELENGTH
SELECTION
0 – 1500 mg/l NaNO
2
PHOT.43.AUTO