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Published on: October 10, 2016
Technical note: interference of Br-, BrO3-, and ClO3- with DOX determination
Journal - American Water Works Association
|August 1, 1995
Summary
The nitrate wash effectively removes bromate and chlorate interference in dissolved organic halogen (DOX) analysis. However, bromide ions can cause a slight positive interference, especially with background organic matter present.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
Background:
- The dissolved organic halogen (DOX) analytic test uses granular activated carbon (GAC) for sample absorption.
- A sodium nitrate wash is employed to remove inorganic chloride interference prior to combustion.
- Potential interferences from other ions like bromide, bromate, and chlorate require investigation.
Purpose of the Study:
- To evaluate the efficacy of the sodium nitrate wash in mitigating interferences during DOX analysis.
- Specifically assess the impact of bromide, bromate, and chlorate ions on DOX measurements.
Main Methods:
- Samples containing known concentrations of bromide, bromate, and chlorate ions were analyzed using the standard DOX test procedure.
- The effectiveness of the sodium nitrate wash was assessed by comparing results with and without the wash.
- Experiments were conducted in the presence of background organic matter to simulate real-world conditions.
Main Results:
- The sodium nitrate wash effectively eliminated interference from both bromate and chlorate ions.
- A minor positive interference (approximately 12 µg Cl-/L per mg/L bromide) was observed due to bromide ions.
- This bromide interference was more pronounced in the presence of background organic matter.
Conclusions:
- The nitrate wash is a reliable method for removing bromate and chlorate interferences in DOX testing.
- Care must be taken to account for potential positive interference from bromide ions, particularly in samples with organic matter.
- Further refinement of the DOX analytic test may be needed to fully address bromide interference.
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