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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

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Spectrophotometric determination of bromate by sequential injection analysis.

J F van Staden¹, L V Mulaudzi, R I Stefan

¹Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa.

|October 31, 2008

Summary

A new spectrophotometric method accurately determines bromate using 5-bromo-PADAP and SCN-. This rapid on-line technique offers a low detection limit for efficient water quality monitoring.

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Area of Science:

Analytical Chemistry
Environmental Science

Background:

Bromate is a potential carcinogen requiring accurate detection.
Existing methods for bromate determination can be time-consuming or complex.

Purpose of the Study:

To develop a simple, rapid, and precise on-line spectrophotometric method for bromate determination.
To establish the analytical performance characteristics of the proposed method.

Main Methods:

On-line spectrophotometry utilizing the reaction between bromate and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-bromo-PADAP) in the presence of thiocyanate (SCN-).
Monitoring the formation of a red complex at 550nm.

Main Results:

A linear range of 0.18–3.00 mg/L was achieved for bromate.
The method demonstrated a low detection limit of 0.15 mg/L.
High sampling rate (45 samples/hour) and excellent precision (<0.8%) were obtained.

Conclusions:

The proposed on-line spectrophotometric method is suitable for rapid and reliable bromate determination.
This method offers advantages in terms of simplicity, speed, and sensitivity for environmental monitoring.