DETERMINATION OF TIN IN MARINE MATERIALS BY USING HYDRIDE GENERATION HIGH-RESOLUTION INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY

A hydride generation system combined with high-resolution inductively coupled plasma mass spectrometry was used to determine tin in marine m aterials. The optimization conditions for determination of tin in this system are 0.015 M of sulfuric acid solution as medium, 0.2% (w/v) of sodium tetrahydroborate(III) in 0.015 M of sodium hydroxide solution as a reductant and argon as the carrier gas at a flow rate of 1.1 1 mi n(-1). In order to remove the interferences from transition element io ns, a strongly basic anion exchanger was used in this method. Tin was converted to its chlorostannate with 2 M hydrochloric acid followed by passing to an anion exchanger. The tin absorbed on the column was the n eluted with 1 M nitric acid. Under the optimized conditions, the det ection limit of the method was 12 ng l(-1) without using the anion col umn as preconcentration method. The results obtained using this method were in good agreement with the certified values of marine standard r eference materials. The recoveries for the method when applied to dete rmine trace tin in river water were 95-115%. (C) 1998 Elsevier Science B.V. All rights reserved.