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Foam flotation-x-ray fluorescence spectrometric determination of trace silver in water samples

Wei Qingxun,Guo Yaxian, Niu Fenglan and Zhai Qingzhou (Department of Chemistry, Jilin University, Changchun)  
Silver ion in the sample of 500ml was reacted with o-phenanthroline to give chelate ion at pH 4.2. The chelate was then floated using sodium dodecylbenzene sulfonate as a counter ionic surfactant. Nitrogen bubbling gas flow rate was 135wlmin-1,and separation took 2 min. The foam collected was defoamed with 1-propanol and evaporated to about 1 ml. The residual solution was dropped to a piece of filter paper and determined by X-ray fluorescence spectrometry. The determinable concentration range was 10-150 ppb.
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