在0.5 mo1·L-1盐酸介质中,La(Ⅲ)-(DBC-偶氮氯膦)所形成的络合物可吸附到201×7型苯乙烯阴离子树脂上.该固相显色体系最大吸收波长位于650 nm,镧的表观摩尔吸光系数为ε650nm=2.08×l05L·mol-1·cm-1.该固相分光光度法测定镧灵敏度为La(Ⅲ)-(DBC-偶氮氯膦)液相分光光度法灵敏度的2.31倍.镧在0～0.44 μg.ml-1范围内遵守比尔定律.考察了26种共存离子对测定镧的影响.本研究所建立的方法已成功地用于分子筛中镧的测定,结果满意.
In the medium of 0.5 mol·L-1 hydrochloric acid, the complex formed by lanthanum(Ⅲ)-(DBC-chlorophosphonazo)can be adsorbed on 201 ×7 type benzenevinyl anion resin. The maximum absorption wavelength of the solid phase color of the solid phase spectrophotometry for the determination of lanthanum is 2.31 times of the sensitivity of the lanthanum(Ⅲ)-(DBC-chlorophosphonazo) liquid phase spectrophotometry. Beer's law is obeyed over the range of 0～0.44developed method has been successfully applied to the determination of lanthanum in molecular sieves with satisfactory results.
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