Abstract
A method for the determination of quantities of 0.5–500 μg of Cr(III) in the presence of chromates and dichromates is described. The samples are dissolved in an aqueous solution buffered at pH 7.0; the Cr(III) is selectively chelated with 2-thenoyltrifluoroacetone and extracted into xylene. The extracted chromium is analyzed using inductively coupled plasma emission spectrometry. Extraction of 1.0 μg Cr(III) from 5.0 mg K2Cr2O7 was accomplished and easily determined in a volume of 25 ml of xylene. The relative standard deviation for the determination of Cr(III) contents ranging from 4.0 × 10−8 g/ml to 2.0 × 10−8 g/ml was ± 0.079. Using a minimum signal to noise ratio of 10∶1, the detection limits of the method were determined to be approximately 2.0 × 10−8 g/ml xylene. Chloride, high surface area silica, and easily oxidized amorphous boron give rise to only minor interferences.
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