Extraction-spectrophotometric determination of boron with 2-methylpentane-2,4-diol and 8-hydroxy-1-(2-hydroxy-1-naphthylmethyleneamino)naphthalene-3,6-disulphonic acid in toluene

Abstract

A spectrophotometric method for the determination of boron after its extraction into toluene containing 2-methylpentane-2,4-diol has been developed. In a portion of the extract boron is determined spectrophotometrically at 460 nm in N,N-dimethylformamide medium after formation of the 8-hydroxy-1-(2-hydroxyl-1-naphthylmethyleneamino)naphthalene-3,6-disulphonic acid-boron complex, in 40% glacial acetic acid, which has been heated at 80 °C for 60 min. The molar absorptivity is 1.54 × 10³ l mol^–1 cm^–1 and the range is linear between 1 and 10 µg ml^–1 of boron. Interferences have also been studied.