DETERMINATION OF CO AND NI IN SOILS AND RIVER SEDIMENTS BY ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROMETRY WITH SLURRY SAMPLING

Cobalt and nickel were determined in slurry samples of soils and river sediments by electrothermal atomization atomic absorption spectrometr y (ETAAS) with Zeeman effect background correction. It is suggested th at cobalt and nickel can be determined simultaneously by slurry sampli ng ETAAS. The results of determinations with the use of slurry samplin g technique and aqueous standards are in good agreement with certified values, and the repeatability of the over-all analytical procedure ex pressed as relative standard deviation is less than 8.8% for Ni and 6. 9% for Co. The characteristic mass is 7.5 pg and 14.1 pg for Co and Ni , respectively. The analytical results are also compared with the resu lts obtained by sample microwave assisted wet digestion followed by in ductively coupled plasma - atomic emission spectrometry (ICP-AES) dete rmination. The influence of sample grinding and sample homogeneity is discussed as well. (C) 1997 Elsevier Science B.V.