GB
Methods
Notes:
1. While the UV lamp is on UV safety goggles must be worn.
2. For handling of the UV lamp see manufacturer's manual.
Do not touch the surface of the UV lamp. Fingerprints will etch the glass.
Wipe the UV lamp with a soft and clean tissue between measurements.
3. The test will not distinguish between benzotriazole and tolyltriazole.
If only tolyltriazoles are present, the displayed result can be converted:
mg/l Tolyltriazole = mg/l Benzotriazole x 1.118
4. The analysis should take place immediately after taking the sample.
5. Strong oxidising or reducting agents in the vial lead to incorrect measurements.
6. To get accurate results the sample temperature must be between 20°C and 25°C.
7. If sample contains nitrite or borax (sodium borate), adjust the pH between 4 and 6
with 1 N sulfuric acid.
8. If the sample contains more than 500 mg/l CaCO
3
hardness (CaCO
3
), add 10 drops of
Rochelle Salt Solution.
9. A yellow colour will form if Triazol is present.
10. Low results will occur if photolysis (lamp on) takes place for more than or less than five
minutes.
Reagent Form of reagent/Quantity Order-No.
VARIO TRIAZOLE Rgt F25 Powder Pack / per 100 532200
UV lamp 220 V 400740
UV lamp 110 V 400745
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