Spectrochemical Determination of Indium and Antimony in Biological Materials

Abstract

Abstract A spectrographic method for the determination of microgram amounts of indium and antimony in biological material is described. Samples are wet-ashed with nitric acid. An HCl solution containing 2 mg of ash is loaded on waterproofed electrodes charged with 5 mg of spectroscopic buffer and the gallium internal standard. The solution is evaporated to dryness in the electrode crater at 105°C. Electrodes are excited in a 220-voIt d-c arc. Spectral lines used are Ga 2943.6 A, Sb 2877.9 A, and In 3039.3 A. Concentrations as low as 1 ppm indium and 50 ppm antimony in 2 mg of ash can be determined. Mean coefficient of variation for indium is 10.9%, that for antimony is 9.9%.