YSI 9300 Photometer - Manual (Page 61)

PHOTOMETER TEST INSTRUCTIONS
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Cyanuric acid is extensively used as a chlorine stabiliser in swimming pool
water. Cyanuric acid itself may be added to the water when the pool is first
filled, or may be introduced gradually through the use of chloroisocyanurate
based chlorine donors. Swimming pool water treatment instructions generally
recommend a cyanuric acid level within the range 30 - 200 mg/l. In some
countries a lower maximum level is recommended. The YSI Cyanuric Acid test
provides a simple method of measuring cyanuric acid level over the range 0 -
200 mg/l.
Method
The YSI Cyanuric Acid test is based on a single tablet reagent containing
melamine and a buffer. Cyanuric acid reacts with melamine in buffered solution
to form an insoluble complex. At the cyanuric acid levels encountered in pool
water, this is observed as turbidity in the test sample. The degree of turbidity is
proportional to the cyanuric acid concentration and is measured using a YSI
Photometer.
Reagents and Equipment
YSI Cyanuric Acid Tablets
YSI 9300 or 9500 Photometer
Round Test Tubes, 10 ml glass (PT 595)
YSI Dilution Tube (PT 512)
Photometer Method
AUTOMATIC
WAVELENGTH
SELECTION
0 – 200 mg/l
PHOT.13.AUTO