On-line preconcentration of trace nickel from electrolytic manganese using minicolumn packed activated carbon for electrothermal atomic absorption spectrometry

Abstract

The online flow injection preconcentration and electrothermal atomic absorption spectrometry method were used for the determination of trace nickel in electrolytic manganese samples by sorption on a conical minicolumn packed with activated carbon at pH 9.0. The nickel was eluted from the minicolumn with 10% (v/v) nitric acid. An enrichment factor of 190-fold for a sample volume of 10mL was obtained. The detection limit (DL) of nickel with the use of the preconcentration method was 13ng·g⁻¹ in the original solid sample. The precision for 10 replicate determinations at 150ng·g⁻¹ nickel concentration was 5.2% relative standard deviation (RSD). The calibration graph was linear with a correlation coefficient of r=0.9996 up to concentration of 660ng·g⁻¹ nickel.

Keywords

online preconcentration / nickel / electrothermal atomic absorption spectrometry / activated carbon / electrolytic manganese

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