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The kinetic behaviours of the substitution reaction of rare earth-PHA with CyDTA were studied systemati-cally.The relationship between the rate constant and atomic number was discussed.The rate differentiation val-ue R_d(R_d=lgk_(z n)-lgk_z)was proposed to evaluate the possibility of differential kinetic analysis.The R_d valuebetween the neighbouring lanthanide ions first increases and then decreases along with increasing atomic number,so that the middle and heavy rare earth mixture(such as Sm-Gd and Gd-Y)are ideal systems for thedifferential rate kinetic analysis. 相似文献
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2-(2-苯胂酸偶氮)-7-(4-溴苯偶氮)-1,8-二羟基-3,6-萘二磺酸,简称对溴偶氮胂,其结构式为: 实验表明,对溴偶氮胂是目前灵敏度最高的稀土显色剂之一。摩尔吸光系数为ε_(Ce)=3.53×10~5、ε_(La)=3.3×10~5,若加入乙醇等有机溶剂,灵敏度还可提高20~30%。大量的Mn~(2 )、Co~(2 )、Zn~(2 )、Cd~(2 )、V~(5 )、Mg~(2 )、Nb~(5 )、W~(6 )、Mo~(6 )不干扰测定。对比度大(△λ=164nm),试剂稳定,可用于痕量稀土的测定。本文讨论了不同条件(酸度、催化剂)对合成的试剂的吸光特性的影响。 相似文献
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DeterminationofTraceAmountofVanadiuminHighPurityY_2O_3byElectrothermalVaporization-ICP-AESwithBi(PDC)_3CoprecipitationHuBin;Ya?.. 相似文献
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