Hach DR/850, Procedures Manual, Page: 167 / 460

167
operator obtained a standard deviation of ±1.2 mg/L
cyanuric acid.
Estimated Detection Limit
The estimated detection limit for program 24 is 7.0 mg/L
cyanuric acid. For more information on the estimated detection
limit, see
Section 1 .
Interferences
Turbidity will interfere. Filter turbid samples before running the
test.
Summary of Method
The test for cyanuric acid uses the turbidimetric method.
Cyanuric Acid 2 Reagent precipitates any cyanuric acid present
and holds it in suspension. The amount of turbidity caused by the
suspended particles is directly proportional to the amount of
cyanuric acid present. Due to the nature of the precipitation
reaction, low levels of cyanuric acid (less than 7 mg/L) are not
detected by this method.
REQUIRED REAGENTS AND APPARATUS
Quantity Required
Description Per Test Unit Cat. No.
Cyanuric Acid 2 Reagent Powder Pillow................ 1 pillow..................50/pkg ............2460-66
Sample Cell, 10-20-25 mL, w/cap ................................2 .........................6/pkg ..........24019-06
OPTIONAL REAGENTS
Cyanuric Acid ............................................................................................. 25 g ........... 7129-24
Water, deionized ........................................................................................... 4 L ............. 272-56
OPTIONAL APPARATUS
Balance, Acculab UI Series.........................................................................each ..........26947-00
Filter Paper, folded 12.5 cm ..................................................................100/pkg ............1894-57
Flask, volumetric, Class A, 100 mL............................................................each ......... 14574-42
Flask, volumetric, Class A, 1000 mL..........................................................each ......... 14574-53
Funnel, poly, 65 mm....................................................................................each ........... 1083-67
Pipet, Bulb...................................................................................................each ..........14651-00
Pipet, volumetric, Class A, 2.00 mL ...........................................................each ..........14515-36
For Technical Assistance, Price and Ordering
In the U.S.A.—Call 800-227-4224
Outside the U.S.A.—Contact the Hach office or distributor serving you.
CYANURIC ACID,
continued