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The adsorption of rare earths,lanthanum,cerium,neodymium,and yttri um by di(2-ethylhexyl) phosphoric acid(D2EHPA) resin in the presence of a compl exing agent,EDTA,was investigated. Flow injection was selected as the injectin g method. Various parameters,sample pH,sample loading time,sample flow rate,EDTA concentration,EDTA flow rate,eluent concentration,and eluent flow rate,were studied and optimized. Under the optimum conditions,the method allowed the determination of rare earths with detection limits of 1.09 μg/L(lanthanum),3 .31 μg/L(cerium),2.05 μg/L(neodymium),and 1.25 μg/L(yttrium) . High repea tabilities were obtained for all the four rare earths(RSD<5%) . The proposed met hod was applied to the determination of the rare earths in water samples with a recovery range of 95.8%-103.3%.
The adsorption of rare earths, lanthanum, cerium, neodymium, and yttrium um by di (2-ethylhexyl) phosphoric acid (D2EHPA) resin in the presence of a compl exing agent, EDTA, was investigated. method. Various parameters, sample pH, sample loading time, sample flow rate, EDTA concentration, EDTA flow rate, eluent concentration, and eluent flow rate, were studied and optimized. Under the optimum conditions, the method allowed the determination of rare earths with The detection limits of 1.09 μg / L lanthanum, 3.31 μg / L cerium, 2.05 μg / L neodymium, and 1.25 μg / L yttrium. High repeatability were obtained for the four rare earths ( RSD <5%). The proposed met hod was applied to the determination of the rare earths in water samples with a recovery range of 95.8% -103.3%.