Anions in potable waters - Determination of Anions in Natural and Treated Waters - page 519

phosphate and sulphate) [90] and arsenite, selenate and selenite [95].
The Environmental Protection Agency US [96] has issued a detailed standard
procedure for the determination of chloride, fluoride, nitrate, nitrite, phosphate and
sulphate in potable waters. For more detail see section 6.1.13.1.
7.28.3 Gas chromatography, bromide and iodide
Grandet et al. [12] have described a method for the determination of traces of bromide
and iodide in potable water which permits determination of 50µg bromide L −1 and 5µg
iodide L −1 , without preconcentration of the sample or 0.5µg bromide and 0.2µg iodide
L −1 after preconcentration. The method is based on the transformation of the halides into
2-bromo- or 2-iodo-ethanol. These derivatives are extracted with ethyl acetate and
determined with an electron capture detector. The difference in the retention periods
enables both halides to be determined simultaneously in one sample. The method is
substantially free of interferences and is suitable for use on many types of water.
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