Urea
Photometric test for Urea in swimming pool and spa water
Colour Change
Colourless to Yellow
Range:
0 - 500 mg/L CH₄N₂O
Technical Resource:
Urea Test Method, Technical Information
01
Set water bath to 100°C and allow it to reach temperature.
02
Add 10 mL of sample to a clean tube. Note: this test uses a 16 mm diameter tube.
03
Use this to "blank" the instrument. Fit the Tubetest adapter to Lumiso, insert tube and press Blank.
04
To an empty 16 mm tube, add 5 mL of sample.
05
Top up to the 10 mL line with Urea Liquid Reagent.
06
Invert tube gently to mix. Do not shake.
07
Add a Urea No1 tablet and a Urea No2 tablet. Crush both tablets until fully dissolved.
08
Invert tube gently to mix. Do not shake.
09
Place in water bath and leave for exactly 30 minutes at 100⁰C.
10
Carefully remove and dry tube.
11
Without delay, place tube in cell holder and press Measure to obtain the concentration of Urea.
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