DETERMINATION OF PLATINUM IN THE ENVIRONMENTAL SAMPLES BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROPHOTOMETRY

Abstract

Graphite furnace atomic absorption spectrophotometry(GFAAS) of platinum in urban air and automobile exhaust gas, as well as in biological samples has been studied. Pollution samples collected through a glass fiber filter were treated with aqua regia and the solution was then evaporated to dryness. The residue was dissolved in 3M hydrochloric acid and tin(II) chloride solution was added. The platinum-tin complex formed was extracted with isoamyl acetate(IA) and the extract was centrifuged. Platinum in the IA extract was measured by means of GFAAS. The present method is reproducible and any disturbance has not been observed. The calibration curve was linear in the range of 0.02-0.2 ppm platinum in the solution and the limit of identification was 0.01 ppm platinum.