Analytical Sciences

Concentration of Some Metal Ions Using 2-(5-Bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol and C18-Bonded Silica Gel

Koichi NAKAGAWA*, Kensaku HARAGUCHI*, Toshio OGATA*, Takunori KATO**,Yukinori NAKATA*** and Kunihiko AKATSUKA***

*Hokkaido National Industrial Research Institute, Toyohira, Sapporo 062-8517, Japan
**Hokkaido Institute of Environmental Science, Kita, Sapporo 060-0819, Japan
***Kitami Institute of Technology, Kitami 090-8507, Japan

A simple and reliable concentration method of trace metals in aqueous solution is proposed. 2-(5-Bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol is used to form water-soluble metal chelates. The chelated metal ions are con-centrated from dilute solution by adsorption onto a C18-bonded silica gel column. The adsorbed chelates are eluted with methanol and 1.0 mol dm -3 HCl and determined by ICP-AES or flame AAS. The proposed method is applied to the determination of heavy metal impurities in some commercial sodium salt reagents. (Keywords: Concentration, trace metals, 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol, C18-bonded)

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