钕存在下二阶导数光谱直接测定镱

Second derivative spectra determination of Yb^( 3+) in the presence of Nd ^( 3+)

在Nd3+、Yb3+共存的RE -XO -CPC弱酸性介质体系中 ,加入F-可有效地掩蔽Nd3+.选用L16( 45)正交表进行试验 ,得到最佳实验条件为 :[XO]=1.31× 10 -4 mol·L-1,[CPC]=4× 10 -4 mol·L-1,[F-]=8× 10 -4 mol·L-1.二阶导数峰 ( + 6 17 5nm) -零法、零 -谷 ( - 5 92 8nm)法、峰 ( + 6 17 5nm) -谷 ( - 5 92 8nm)法测定Yb3+时 ,3倍量的Nd3+不干扰测定 ,直线回归方程分别为 :y =9.47× 10 -3 + 2 47× 10 -3x(峰 -零法 ,相关系数p =0 .9990 ) ;y =1.70× 10 -3 + 6 .5 6× 10 -3x(零 -谷法 ,p=0 .9998) ;y=2 .6 4× 10 -3 + 1.0 7× 10 -2 x(峰 -谷法 ,p =0 .9949) .用零 -谷法对不同配比Nd3+、Yb3+混合物进行分析 ,平均偏差在 12 0 % - 2 4 0 % ,变异系数在 1 80 % - 6 98% .

In the weak acid system RE-XO-CPC of Nd 3+ 、Yb 3+ co existing,F - is added to cover Nd 3+ effectively.When L 16 (4 5) orthogonal layout is selected to test,optimum testing conditions obtained are:[XO]=1.31×10 -4 mol·L -1 ,[CPC]=4×10 -4 mol·L -1 ,[F -]=8×10 -4 mol·L -1 .Triple quantation of Nd 3+ do not interfere the determination of Yb 3+ using second derivative spectra.Linear regression equations are respectively:y=9.47×10 -3 +2.47×10 -3 x (Peak Zero method,Correlation coefficient p=0.9990);y=1.70×10 -3 +6.56×10 -3 x (Zero Valley method,p=0.9998);y=2.64×10 -3 +1.07×10 -2 x (Peak Valley method,p=0.9949).It has been analyzed for synthesized samples of mixed compounds Yb and Nd to use zero valley method.Average deviation are 12.0%-24.0%,variation coefficient are 1.80%-6.98%.