LaMotte COD3 Plus, Operator'S Manual

Page: 67 / 119

COD3 Plus Colorimeter 10.16
Cyanuric Acid
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
*WARNING: Reagents marked with an * are considered to be potential health hazards.
To view or print a Safety Data Sheet (SDS) for these reagents go to www.lamotte.com.
Search for the four digit reagent code number listed on the reagent label, in the
contents list or in the test procedures. Omit any letter that follows or precedes the
four digit code number. For example, if the code is 4450WT-H, search 4450. To obtain
a printed copy, contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-Tel:
(US, 1-800-255-3924) (International, call collect, 813-248-0585).
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 buff ered 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).
Testing