LaMotte 3684-01, Instruction Manual

Page: 6 / 36

6
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Accessories
DESCRIPTION CODE
Test Tubes, with Caps 0290-6
Replacement Chamber 3-0038
USB Cable 1720-01
USB Wall Adapter 1721
Car Charger 5-0132
WARNING: Only use the USB Cable (1720-01) that is supplied with the kit. Make
no substitutions.
TEST METHODS SPECIFICATIONS
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INTRODUCTION
Urea is the main nitrogen-containing contaminant in swimming pools. It reacts
with free available chlorine to form chloramines which can cause taste and odor
problems and eye irritation. Urea also acts as a nutrient for algae and bacteria.
It is introduced by bather’s sweat and is the main component of urine.
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APPLICATION
Swimming Pools
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RANGE
0.0 – 6.0 mg/L urea
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METHOD
Urease catalyzes the hydrolysis of urea to produce ammonia. 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 urea concentration in the sample.
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HANDLING & PRESERVATION
Urea solutions are unstable and should be analyzed as soon as possible.
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INTERFERENCES
High concentrations of reducing agents will react with the chlorine donor and
result in a negative interference. Color and turbidity can also interfere.