EPA-NERL: 320.1: Bromide by Titration
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Official Method Name
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Bromide (Titrimetric) |
|---|---|
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Current Revision
| Issued 1974 |
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Media
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WATER |
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Instrumentation
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Titration |
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Method Subcategory
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Inorganic |
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Method Source
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Citation
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Brief Method Summary
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After pretreatment to remove interferences, the sample is divided into two aliquots. One aliquot is analyzed for iodide by converting the iodide to iodate with bromine water and titrating iodometrically with phenylarsine oxide (PAO) or sodium thiosulfate. The other aliquot is analyzed for iodide plus bromide by converting these halides to iodate and bromate with calcium hypochlorite and titrating iodometrically with PAO or sodium thiosulfate. Bromide is then calculated by difference. |
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Scope and Application
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This method is applicable to drinking, surface, and saline waters; domestic and industrial waste effluents. |
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Applicable Concentration Range
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2-20 mg bromide/L. |
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Interferences
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Iron, manganese and organic matter can interfere; however, the calcium oxide pretreatment removes or reduces these to insignificant concentrations. Color interferes with the observation of indicator and bromine-water color changes. This interference is eliminated by the use of a pH meter instead of a pH indicator and the use of standardized amounts of oxidant and oxidant-quencher. |
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Quality Control Requirements
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None. |
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Sample Handling
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Store at 4oC and analyze as soon as possible. |
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Maximum Holding Time
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28 days. |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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None. |
