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Applying the phenol red colorimetric method for bromide analysis to reducing waters.

¹CSIRO Division of Coal and Energy Technology, P.O. Box 136, North Ryde, N.S.W. 2113, Australia.

|January 1, 1993

Summary

Reducing waters can interfere with trace bromide analysis by consuming chloramine T (CT). A new method effectively destroys interfering hydroxylamine (NH2OH) using permanganate and hydrogen peroxide, ensuring accurate results.

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Area of Science:

Analytical Chemistry
Environmental Chemistry

Background:

Reducing waters contain chemical species that interfere with trace bromide analysis.
The standard phenol red-based calorimetric method uses chloramine T (CT) as an oxidizing agent.
Hydroxylamine (NH2OH) is a common interferent in both groundwater and surface water.

Purpose of the Study:

To address the negative interference caused by hydroxylamine in trace bromide analysis.
To develop a robust and easy-to-implement method for removing hydroxylamine interference.

Main Methods:

Investigated interferences in the phenol red-based calorimetric method for bromide.
Developed a pre-treatment step using permanganate and hydrogen peroxide to destroy hydroxylamine.
Validated the method's compatibility with the existing calorimetric technique.

Main Results:

Manganese (Mn2+) and iron (Fe2+) did not interfere up to 200µM.
Hydroxylamine (NH2OH) caused significant negative interference.
The permanganate and hydrogen peroxide pre-treatment effectively destroyed NH2OH.

Conclusions:

The developed pre-treatment method successfully eliminates hydroxylamine interference in trace bromide analysis.
The procedure is compatible with the calorimetric method, robust, and easy to implement.
This method enhances the accuracy of bromide determination in natural waters.