CYANURIC ACID
MELAMINE METHOD–TURBIDITY • CODE 3661-01-SC
QUANTITY CONTENTS CODE
2 x 100 mL *Cyanuric Acid Test Solution *4856-J
1 Syringe, 5 mL 0807
Cyanuric acid is added to swimming pool water as a stabilizing agent for free
chlorine residuals. It minimizes the loss of chlorine from the action of ultraviolet rays
in sunlight. Cyanuric acid levels in pools should be maintained between 25 and
75 ppm and various public health associations recommend that the concentration
should never exceed 100-150 ppm.
APPLICATION: Swimming pool waters.
RANGE: 5–200 ppm Cyanuric Acid
MDL: 10 ppm
METHOD: A buffered solution of melamine forms a precipitate with
cyanuric acid in proportion to the amount of cyanuric
acid present. The amount of particles in suspension is
measured turbidimetrically.
SAMPLE HANDLING
& PRESERVATION:
Cyanuric acid samples should be analyzed as soon as
possible after collection. Deterioration of the sample
can be minimized by keeping samples in the dark or
refrigerated until analysis can be performed.
INTERFERENCES: No known interference from compounds normally found
in pool water. Temperature of the sample should be
maintained between 70°F and 80°F for best results.
Check for stray light interference (see p. 69).
SMART3 Test Procedures 11.10 CYANURIC ACID, Liquid
Test Procedures
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