摘要
恒电流库仑滴定时无论用电位法或是用电流法指示终点,恒电流都会影响指示信号的观测;用新极谱分析法指示恒电流库仑滴定终点,同样受恒电流干扰,为了判断滴定终点,需多次断电停止滴定,观测峰高。本文提出根据两次间隔滴定观测到的峰高获得分析结果的方法。 对滴定反应aA+bB=AaBb,当滴定剂A是电生时,在滴定过程中溶液体积不会改变,则A或B的新极谱图的峰高将与溶液中A或B的摩尔数成正比。
For the titration reaction aA+bB=A_aB_b,where A and B is the electrogenerated titrantand the substance to be determined respectively,following formula can be derived for com-bined coulombmetric---new polarographic determination. W_B=biM_B/an_AF(t_1+h_1/(h_1-h_2)t_2)where W_B=the weight of substance to be determined, i=current used in coulombmetry,t_1,t_2 are times of electrogeneration adopted near tbe cnd point of titration for B or slightlyover the cnd point for A,h_1,h_2, are corresponding heights of current peak in. new polarog-raphic determination of A or B at t_1 and t_2 respectively, M_B=formula weight of B,n_A=electron tranfer number formation of A.
出处
《应用化学》
CAS
CSCD
北大核心
1989年第6期83-85,共3页
Chinese Journal of Applied Chemistry
