EPA Method 320.1

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EPA Method 320.1:
Bromide by Titration. Official Name: Bromide (Titrimetric)

Summary:
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.

Scope:
This method is applicable to drinking, surface, and saline waters; domestic and industrial waste effluents.

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
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.

QC Requirements:
None.

Maximum Holding Time:
28 days.

Media:
WATER

Subcategory:
Inorganic

Concentration:
2-20 mg bromide/L.

Sample Prep:
None.

Precision:
Precision and accuracy were calculated using analyses of fortified domestic and industrial waste effluent. Data at other concentrations are available in the method.

Detection:
None.

Revision Number:
Issued 1974