Determination of traces of cadmium in natural water samples by flow injection on-line preconcentration-graphite furnace atomic absorption spectrometry.
A flow injection on-line preconcentration-graphite furnace atomic absorption spectrometric method was developed for the determination of traces of cadmium in natural water samples. Cadmium in samples was adsorbed on an iminodiacetate-type chelating resin, Muromac A-1 microcolumn (3 mm i.d. and 10 mm long), and then eluted with 2 mol l-1 HNO3. The eluate was introduced into the injection tip of an autosampler. The eluate zone with the highest analyte concentration was injected into the graphite furnace by cooperation of a peristaltic pump and a syringe pump of the autosampler, which were controlled by a programmable controller. The present system was successfully applied to the determination of cadmium in natural water samples. A detection limit of 0.2 ng l-1 was obtained with 12 ml sample loading. The recoveries were 99 and 108% for tap water (4 ml loading) and underground water (12 ml loading), respectively. Analytical results obtained for a river water reference material (JAC-0031, Japan Society for Analytical Chemistry) were close to the reference value.
Hirano
Y
Y
Department of Materials Technology, Faculty of Engineering, Chiba University, Yayoi-cho, Inage, Chiba 263-8522, Japan.
Nakajima
J
J
Oguma
K
K
Terui
Y
Y
D002104:Cadmium / Q000032:analysis*; D002614:Chelating Agents; D003300:Copper / Q000032:analysis; D017022:Flow Injection Analysis; D007202:Indicators and Reagents; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
D002614:Chelating Agents; D007202:Indicators and Reagents; D014874:Water Pollutants, Chemical; D002104:Cadmium; D003300:Copper