LaMotte DC1600 Colorimeter - Manual (Page 13)

AMMONIA NITROGEN ~ LOW RANGE
SALICYLATE METHOD CODE 3659-01
QUANTITY CONTENTS CODE
60 mL *Ammonia #1 *3978-H
10 g *Salicylate #2 *7457-D
5 g *Salicylate #3 *7458-C
1 Spoon, 0.1 g, plastic 0699
1 Spoon, 0.15 g, plastic 0727
1 Pipet, 1.0 mL, plastic 0354
*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.
APPLICATION: Low concentrations of ammonia in fresh, brackish and salt water. Fresh and salt water
aquariums.
RANGE: 0 – 1.0 ppm Ammonia-Nitrogen
METHOD: Salicylate and ammonia react at high pH in the presence of a chlorine donor and an iron
catalyst to form a blue indophenol dye, the concentration of which is proportional to the
ammonia concentration in the sample.
SAMPLE HANDLE
& PRESERVATION: Ammonia solutions tend to be unstable and should be analyzed as soon as possible. Samples
can be stabilized by adjusting the pH to less than pH 2 with HCl. The solution should then be
neutralized with NaOH before performing the test.
INTERFERENCES: There are few interferences in most natural waters. High concentrations of reducing reagents,
such as hydrazine, react with the chlorine donor and can result in negative interferences. Color
and turbidity can also interfere.
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