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Indirect Determination of Bromide at Trace Levels in Soil Extracts

Dep. of Agronomy and Soils, Auburn Univ., AL 36849-5412

*Corresponding author.

ABSTRACT

An indirect spectrophotometric method for the determination of Br in 1 M NH₄OAc soil extracts has been developed. Bromide catalyses the oxidation of I₂ to IO₃. Thus, the quantity of I₂ remaining after a fixed reaction interval serves as an indirect measure of Br. The reaction is slow enough at 0 °C to be analytically useful. Samples of the Ap horizons of three representative southeastern USA soil series (Decatur, Houston, and Orangeburg) were spiked (0–10 mg Br kg^–1 soil) with CsBr and, following incubation, extracted with either 1 M NH₄OAc or H₂O. The 1 M NH₄OAc extracts were acidified with H₂SO₄, KI and KMnO₄ added, and the system allowed to react for 10 min. The unreacted I₂ was extracted into CCl₄ for measurement at 515 nm. The recovery of added Br was comparable for NH₄OAc and H₂O, ranging from 84 to 115% for 2:1 solution-to-soil extracts. The method has a precision of about 3% in the range of 0.4 to 1.2 µg Br and a detection limit of 0.03 µg Br.

Contribution from the Dep. of Agronomy and Soils and Alabama Agric. Exp. Stn., Auburn Univ. The investigation reported in this paper (no. 3-892388P) is in connection with a project of the Alabama Agric. Exp. Stn. and is published with the approval of the director.

Received for publication January 2, 1990.