Photometric determination of nitrite.

Area of Science:

• Analytical Chemistry
• Environmental Chemistry

Background:

• Nitrite is an important water quality indicator.
• Accurate nitrite determination is crucial for environmental monitoring.

Purpose of the Study:

• To develop a sensitive and rapid colorimetric method for nitrite determination.
• To establish a reliable analytical procedure for quantifying nitrite concentrations.

Main Methods:

• Diazotization of nitrite with p-aminobenzoic acid.
• Coupling of the diazonium ion with 8-hydroxyquinoline in an alkaline medium.
• Formation of a reddish-orange water-soluble azo dye.

Main Results:

• The reaction produces a stable azo dye with color intensity directly proportional to nitrite concentration.
• The method is sensitive and does not require strict temperature control.
• The colorimetric assay is effective over a wide range of nitrite concentrations.

Conclusions:

• A new, sensitive, and stable colorimetric method for nitrite determination has been successfully developed.
• This method offers a simple and efficient approach for routine nitrite analysis.
• The assay's reliability makes it suitable for environmental and water quality assessments.