LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 84)

CYANURIC ACID
MELAMINE METHOD - TURBIDITY • CODE 366I-SC
QUANTITY CONTENTS CODE
2 x 250 mL *Cyanuric Acid Test Solution
*4856-K
1 Syringe, 5 mL
0807
*WARNING: Reagents marked with * are considered hazardous substances. Material
Data Safety Sheets (MSDS) are supplied for these reagents. For your safety, read label
and accompanying MSDS before using.
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
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 page 17).
COD PLUS TEST PROCEDURES 6/02 CYANURIC ACID 1/2