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Sodium Bromide and bromide ions, are known to be naturally present in soils in varying background concentrations. Published data have been summarised (Flury M., et al., 1993) indicating an average concentration of ca. 1 mg(Br-)/kg for typical soils throughout Europe. These observations are supported by soil bromide concentrations determined in a number of soils in the UK ranging from 0.3 to 1.6 mg(Br-)/kg (Maw G.A., et al., 1982). Further data have been published detailing soil water bromide levels of 0.5 mg(Br-)/L (Hill A.R., et al., 1998) for soils in Canada, and soil bromide levels of 0.5 to 1.6 mg(Br-)/kg (Hatton T.J., et al., 2002) for soils in Australia.

Consequently an approximate background level of 1 mg(Br-)/kg in soil, as presented by Flury, et al., is considered justified, and such levels can be considered to result in minimal adverse effects on the flora and fauna present in such soils through chronic exposure.