YSI 9300 Photometer - Manual (Page 109)

PHOTOMETER TEST INSTRUCTIONS
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Hydrazine is used as an oxygen scavenger in high pressure boilers and steam
raising plant. Hydrazine is particularly advantageous in that it does not
contribute solids to the boiler water.
The YSI Hydrazine test provides a simple means of measuring hydrazine levels
in boiler feed water and boiler water over the range 0 - 0.5 mg/l.
Method
The YSI Hydrazine test uses a special reagent powder containing p-dimethyl-
aminobenzaldehyde in an acidic formulation. Hydrazine reacts with this reagent to
produce a yellow coloration. The intensity of the color produced is proportional to
the hydrazine concentration and is measured using the YSI Photometer.
Reagents and Equipment
YSI Hydrazine Test Powder
YSI 9300 or 9500 Photometer
Round Test Tubes, 10 ml glass (PT 595)
Scoop, 1g approx (PT 697)
Test Instructions
1 Filter sample if necessary to obtain clear solution.
2 Take two test tubes A and B.
3 Fill test tube A with sample to the 10 ml mark.
4 Fill test tube B with deionised water to the 10 ml mark.
5 To each tube add one level scoop (1g) of Hydrazine Test Powder. Mix to
dissolve and cap tubes.
6 Stand for two minutes to allow full color development.
7 Select Phot 41 on photometer.
8 Take photometer reading of Tube A in usual manner (see photometer instructions).
9 Use Tube B as the Blank to set the instrument.
10 The result is displayed as mg/l N
2
H
4
.
Photometer Method
AUTOMATIC
WAVLELENGTH
SELECTION
0 – 0.5 mg/l N
2
H
4
PHOT.41.AUTO