Automated flow-injection method for cadmium determination with pre-concentration and reagent preparation on-line

Automated flow-injection method for cadmium determination with pre-concentration and reagent preparation on-line

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The spectrophotometric determination of Cd(II) using a flow injection system provided with a solid-phase reactor for cadmium preconcentration and on-line reagent preparation, is described.It is based on the formation of a dithizone-Cd complex Antenna Plug in basic medium.The calibration curve is linear between 6 and 300 µg L-1 Cd(II), Serum Spray with a detection limit of 5.4 µg L-1, an RSD of 3.7% (10 replicates in duplicate) and a sample frequency of 11.

4 h-1.The proposed method was satisfactorily applied to the determination of Cd(II) in surface, well and drinking waters.