Analytical Sciences

Abstract − Analytical Sciences, 22(1), 177 (2006).

Determination of Trace Amounts of Cobalt(II) by Flow Injection-Solid Phase Spectrometry (FI-SPS) with 5-Br-PADAB
Shiro MATSUOKA,* Nobutoshi SHIOTA,** and Kazuhisa YOSHIMURA**
*Department of Environmental Science, Faculty of Science, Niigata University, Ikarashi, Niigata 950-2181, Japan
**Department of Chemistry, Faculty of Sciences, Kyushu University, Ropponmatsu 4-2-1, Chuo-ku, Fukuoka 810-8560, Japan
Flow injection-solid phase spectrometry (FI-SPS) has been applied to the determination of cobalt(II) in water samples. The complex formed between cobalt and 5-Br-PADAB was on-line protonated and concentrated on an AG 50W-X2 cation-exchanger in a flow-through cell. The increase in absorbance caused by the accumulation of the complex in the resin was continuously measured. The interference by copper could be effectively eliminated by using EDDP as a masking agent. The detection limit was 40 ng dm-3 with a 4.0 cm3 sample solution.