3. Results and discussions
The preliminary experiments showed that the triiodide ion formed
from the oxidation reduction reaction of nitrite–iodide in acidic media
is extracted into non ionic surfactant Triton X-100. As a result of this
observation a cloud point method was developed for the determination
of nitrite. The absorption spectrum of extracted surfactant rich phase
diluted with water showed a maximum band at 365 nm which was
selected for absorbance measurements. The effect of the different
variables was optimized in order to achieve the highest sensitivity.