極微量成分分析における前濃縮方法としてのイオン浮選

概要

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The concentration factor of a trace element with respect to a matrix element (usually 10 to 20 in the ion flotation technique) is much improved by the use of ethanol and multistage operation. Nitrogen is bubbled through a 200ml solution (pH 3 to 13) containing a trace element (Ag, Au, Co, Cu, Fe. 0.1 to 1.0 μg), a matrix element (Mg, Na, Zn. 0.5 to 3 g), a complexing agent (10-4M), benzalkonium chloride (10 ppm) and ethanol (4%), until the froth on the surface has ceased to grow. The froth containing the concentrated trace element is then taken out, destroyed by addition of 8 ml of ethanol, diluted to 200ml with water, and the flotation is repeated. The desired trace elements can be concentrated in greater than 90% yields with concentration factors of 30, 103 and 3×104 for single-, two- and three-stage separations, respectively. The time required for each stage is 8 to 10 min.
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