Tintometer Lovibond MD100 Manual De Instrucciones página 29

Methods
GB
Notes:
1. Extremely basic or acidic water samples should be adjusted with 0.5 mol/l (1 N) Sulfuric
acid solution or 1 mol/l (1 N) Sodium hydroxide solution to pH 7.
2. Interferences:
Interfering substance
Calcium
Iron
Magnesium
Nitrate
Nitrite
Phosphate
Sulfate
Sulfide
Glycine, Hydrazine,
Colour, Turbidity
3. Conversion:
mg/l NH = mg/l N · 1.29
4
mg/l NH = mg/l N · 1.22
3
Reagent
Set
VARIO Ammonia Salicylate F10
VARIO Ammonia Cyanurate F10
MD100_8b 05/2019
Interference levels and treatments
greater than 1000 mg/l CaCO
Interferes at all levels. Correct as follows:
a) determine the concentration of iron present in the
sample by performing a total Iron test
b) add the same iron concentration as determined to
the deionised water
The interference will be blanked out successfully.
greater than 6000 mg/l CaCO
greater than 100 mg/l NO
greater than 12 mg/l NO
greater than 100 mg/l PO
greater than 300 mg/l SO
intensifies the colour
Less common interferences such as Hydrazine and
Glycine will cause intensified colours in the prepared
sample. Turbidity and colour will give erroneous high
values. Samples with severe interferences require
distillation.
Form of reagent/Quantity
Powder Pack / per 100 PP
3
3
-N
3
-N
2
-P
4
4
Order-No.
535500
29