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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.
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.
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.
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