混合显色剂同时测定时酸度问题的探讨

Acidity Range of Simultaneous Determination with Mixed Chromogenic Reagents

提出了混合显色剂同时测定时酸度范围的简便计算公式为:(mq-np)lg[R]>(mlgβNLn-nlgβMLm)+(nlgβMRp-mlgβNRq)+2(m+n),(mq-np)lg[L]>(plgβNLn-qlgβMLm)+(qlgβMRp-plgβNRq)+2(p+q).lg[R]>2-lgKNRq,lg[L]>2-lgKMLm,其中M、N为被测金属离子,R、L为显色剂,β、K分别为各配合物的累积稳定常数和稳定常数.根据系数mq和np的相对大小,前两式均可分为三种情形.

Simple equations for calculating acidity range of simultaneous determination with mixed chromogenic reagents are presented in this paper ：（mq-np）lg[R]（mlgβNLn-nlgβMLm）＋（nlgβMRp-mlgβNRq）＋2（m＋n）,（mq-np）lg[L]（plgβNLn-qlgβMLm）＋（qlgβMRp-plgβNRq）＋2（p＋q）.lg[R]2-lgKNRq,lg[L]2-lgKMLm, where M and N are metal ions to be measured,R and Lare chromogenic reagents.CM and CNare analytical concentrations of metal ions M and N respectively.β and K are accumulative stability constants or stability constants of coordination compounds respectively.The former two equations can be divided into three categories according to the relative values of coefficients of mq and np.