CONDUCTOMETRIC METHOD FOR COLLOID TITRATIONS
CONDUCTOMETRIC METHOD FOR COLLOID TITRATIONS
复制标题
DOI：
10.1016/s0003-2670(01)84631-6
复制
发表时间：
1976-01-01
影响因子：
6.2
通讯作者：
KOHARA, T
中科院分区：
文献类型：
--
作者：
TOEI, K;KOHARA, T
负或正胶体样品溶液可以分别用聚阳离子（聚n， n -二烯基二甲基氯化铵）或聚阴离子（聚乙烯基硫酸钾）滴定剂直接滴定至电导终点。用传统的甲苯胺蓝指示剂法，正离子胶体溶液直接用聚阴离子滴定剂滴定，而负离子胶体溶液必须用过量的聚阳离子滴定剂处理，用聚阴离子滴定剂反滴定。对于正胶体溶液，指示剂法和电导法都适用；对于负性胶体，电导法是优选的，因为它的滴定值在一定的pH值范围内是恒定的。
A negative or positive colloid sample solution can be directly titrated, respectively, with a polycationic (poly-N, N-diallyldimethylammonium chloride) or polyanionic (potassium polyvinylsulfate) titrant to a conductometric end-point. With the conventional toluidine blue indicator method a positive colloid solution is titrated directly with a polyanionic titrant, but a negative colloid solution must be treated with an excess of a polycationic titrant, which is back-titrated with the polyanionic titrant. For positive colloid solutions, both indicator and conductometric methods are suitable; for negative colloids the conductometric method is preferable because of its constant titration vlues over a range of pH values.