DETERMINATION OF TRACE-METALS AND SPECIATION OF CHROMIUM IONS IN ATMOSPHERIC PRECIPITATION BY ICP-AES AND GFAAS

Sampling and analytical techniques used for determining trace metal co ncentrations in atmospheric precipitation waters collected in Hungary are presented. The results of the analyses are briefly discussed and s pecial attention is devoted to chromium speciation. For the preconcent ration of the trace metals a chelating cellulose, iminodiacetic acid e thylcellulose (IDAEC) microcolumn was used in a flow-injected system. Cd, Co, Cu, Fe, Mn, Ni, Pb, Ti, V and Zn were determined by ICP-AES. I n precipitation water the concentrations of the trace elements were in the 0.1-50 mug/l. range. The two forms of chromium, Cr(III) and Cr(VI ) were separated using IDAEC and the anion exchanger diethylamine ethy lcellulose, respectively. Cr was determined by GFAAS. In atmospheric p recipitation the concentration of Cr(III) was in the range of 0.1-0.4 mug/l. while that of Cr(VI) in the range of 0.04-0.1 mug/l.