Solid Phase Extraction and Flame Atomic Absorption Determination of Cadmium in Water Samples

A new sensitive and selective method including solid phase preconcentration and next determination of trace amounts of Cd(II) by flame atomic absorption spectroscopy in water samples was developed. Cadion was coated on carbon active powder and used as a solid phase sorbent. Detection limit for extraction of 2000 mL aqueous solution is 0.35 μg·L –1 . The relative standard deviations for concentrations 2.5 and 15 μg·L –1 with preconcentration factor 200, 0.4 and 0.2% ( n = 3) were obtained, respectively. The calibration curve is linear in the range of 1.5–15 μg·L –1 . The accuracy of the method was evaluated and confirmed by the inductively coupled plasma atomic emission spectrometric analysis. Method was applied for the determination of cadmium in well water.