Chelating resin micro-column separation/preconcentration and electrothermal vaporization ICP-OES determination of trace bismuth in environmental and biological samples

摘要

A new method for the determination of trace Bi in environmental and biological samples by chelating resin YPA4 microcolumn separation/preconcentration in conjunction with electrothermal vaporization-inductively coupled plasma optical emission spectrometry (ETV-ICP-OES) has been developed. The resin loaded with Bi was prepared by slurrying and then directly introduced into the graphite furnace without any pretreatment. The factors affecting the adsorption and vaporization behavior of Bi were investigated in detail. It was found that chelating resin YPA4 is not only an effective solid phase extractant for the quick adsorption of Bi in a wide acidity range of 0.1-3.5 mol L-1 HCI, but also a chemical modifier to vaporize Bi quantitatively from the furnace at the low vaporization temperature of 1000 degrees C. With the use of YPA4 as a chemical modifier, the sensitivity was increased by a factor of 6. Under optimum conditions, the adsorption capacity of YPA4 for Bi was 63.5 mg g(-1); the detection limit (3 sigma) of the instrument for Bi was 300 pg, with the relative standard deviation (RSD) of 3.5% (n=8, C=2 mu g mL(-1)). The proposed method was applied to the ETV-ICP-OES determination of trace Bi in environmental and biological reference materials, and the determined values were in good agreement with certified values.