论文部分内容阅读
Krbl等在Pb的络合滴定中使用二甲苯酚橙(Xylenol Orange,以下简称X.O.)作为指示剂在pH=5的缓冲液中进行滴定。(tudlar等在pH=6时用X.O.光度法测定Zn时,发现Pb~(2+)有干扰。他们指出,Pb~(2+)与X.O.在测定Zn的条件下生成了在530毫微米呈现最大吸收的络合物。因此,用X.O.测定Zn~(2+)时必须事先将Pb除去。关于Pb~(2+)与X.O.反应的研究,迄今尚未见有报告发表。我们曾对Pb~(2+)、Ni~(2+)、Co~(2+)、Cu~(2+)等离子与X.O.的反应进行了初步的光度法考察,作出了这些离子与X.O.反应生成的络合物的光吸收曲线,并确定了在一定条件下这些络合物的组成。为了进一
Krbl et al. Use titration of xylenol orange (X.O.) as an indicator in the complexometric titration of Pb in a pH = 5 buffer. (Tudlar et al. found that Pb 2+ interfered with Zn by XO spectrophotometry at pH = 6. They showed that Pb 2+ and XO produced Zn at 530 nm in the presence of Zn The maximum absorption of the complex.Therefore, the determination of Zn ~ (2) by XO must be removed beforehand Pb.Research on the reaction of Pb2 + with XO, no report has been published.We have Pb ~ (2 +), Ni ~ (2 +), Co ~ (2 +), Cu ~ (2+) ions and XO were investigated spectrophotometrically and the complex formed by the reaction of these ions with XO Of the light absorption curve, and to determine the composition of these complexes under certain conditions.In order to further