This method is for the determination of bromide from drinking, surface, and saline waters, domestic and industrial waste effluents. After pretreatment with calcium oxide 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.
The concentration range for this method is 2-20 mg bromide/L.
Iron, manganese and organic matter can intefere with the method, 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 use of a pH meter instead of a pH indicator and use of the standardized amounts of oxidant and oxidant-quencer.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 28 days from sample collection to analysis but the method says to analyze as soon as possible. |
| Preservatives: | Store samples at 4°C. |
| Required Preps: | 500mL plastic bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Titration |
| Documentation: | 
320.1
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Bromine | Br2 |
7726-95-6 |
20 |
mg/L |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.