DBC-偶氮氯膦固相光度法测定稀土元素铈,铕,钇

Determination of rare earth elements Cerium,Europium, Yttrium with DBC-chlorophosphonazo by solid phase spectrophotometry

在2 mol/L HCl介质中,Ce(Ⅲ),Eu(Ⅲ),Y(Ⅲ)与DBC-偶氮氯膦形成的络合物吸附到201×7型强碱性苯乙烯阴离子树脂上.最大吸收波长Ce(Ⅲ)络合物为648 nm,Eu(Ⅲ)络合物为650 nm, Y(Ⅲ)络合物为650 nm.Ce(Ⅲ)络合物表观摩尔吸光系数为ε648 nm=9.6×104 L·mol-1·cm-1,Eu(Ⅲ)络合物表观摩尔吸光系数为ε650 nm=1.51×105 L·mol-1·cm-1,Y(Ⅲ)络合物表观摩尔吸光系数为ε650 nm=5.6×104 L·mol-1·cm-1. 固相光度法测定Ce(Ⅲ),Eu(Ⅲ),Y(Ⅲ)质量浓度在0～0.48 μg/mL范围内与吸光度值呈良好线性关系.该法可用于分子筛中Ce的测定.

Abstract： In the medium of 2 mol/L of hydrochloric acid, cerium （ Ⅲ）, europium （Ⅲ）, yttrium （Ⅲ ）-（ DBC- hlorophosphonazo） complexes were adsorbed on 201 × 7 type strong base benzenevinyl the systems exhibit absorption nm with apparent molar anion exchange resin and maxima at 648, 650, 650 vities of 9.6×10^4, 1.51×10^5, 5.6 × 10%4 L·mol^-1·cm^-1 for cerium, europium, yttrium complexes, respectively. Beer＇ s law is obeyed over the range of three rare earth elements 0 - 0.48 μg/mL of cerium, europium, yttrium for the present method. The effects of 33 diverse ions on the detemtination of cerium, europium, yttrium for the solid phase spectrophotometric system were observed, respectively. The method was successfully applied to the detemtination of cerium in molecular sieve with satisfactory results.