Glassy tin arsenate, Sn(HAsO4)2-2.7H20 (SnAs) was prepared and characterized. The uptake of lanthanide ions La 3+, Sm 3+, Eu 3+, and Yb 3+ was followed on the glassy tin arsenate in HNO 3 solution at pH 1,2 and 4. The radiotracers are 14~ I53Sm, I52mEu, and ~75yb. 500p_l (4.0.10 -5 mmole) of each solution of the tracer as a mixture plus 7.5 ml HNO 3 solution at the desired pH were equilibrated with 0.1 g of SnAs.The selectivity order (K a values) was found to be dependent on the pH. At pH 2 the K a values were high for all the studied metal ions
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