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Multi element pre concentration of trace heavy metals in water by co precipitation and flotation with indium hydroxide for inductively coupled plasma atomic emission spectrometry



Multi element pre concentration of trace heavy metals in water by co precipitation and flotation with indium hydroxide for inductively coupled plasma atomic emission spectrometry



Analytical Chemistry 52(6): 804-807



Microgram quantities of Cr(III), Mn(II), Co, Ni, Cu(II), Cd and Pb in 1200-ml samples are quantitatively coprecipitated with indium hydroxide at pH 9.5. After adding ethanolic solutions of sodium oleate and dodecyl sulfate, the precipitates are floated with numerous tiny N bubbles to the solution surface and then collected in a small sampling tube. The procedure is simple and rapid, and suitable for operation at sampling spots. The heavy metals in the dissolved precipitates are determined by inductively coupled plasma-atomic emission spectrometry. The concentrations of the heavy metals are increased 240-fold, and those of alkali and alkaline earth metals in artificial seawater are reduced to 1/50-1/20 for Na and K and about 1/2 for Mg, Ca, and Sr.

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