In Situ / Laboratory Testing

· Colour
In Situ:
Unit of measurement: “HAZEN”
Colour is determined measured visually with the use of a Colour Comparator.

· Nitrate
In situ:
1) Nitraver 5 Nitrate reagent powder added to 10ml of sample.
2) Shake vigorously for a minute.
3) Allow reaction to occur for another five minutes.
4) If nitrate is present, amber colour develops.
5) Determine concentration of nitrite via colorimetry by comparing against a blank sample using a turntable colour comparator

In lab: Titration - Kjeldahl method titrate (sulphuric acid) indictor (Indicating Boric Acid)

· Nitrite
In situ:
1) Nitraver 5 Nitrate reagent powder added to 10ml of sample.
2) Shake vigorously a minute.
3) Allow reaction to occur for another five minutes.
4) If nitrate is present, amber colour develops.
5) Determine concentration of nitrite via colorimetry by comparing against a blank sample using a turntable colour comparator

Nitrate/Nitrite In Situ Testing: Using a turntable Colour Comparator