摘要
4-(6′-溴苯并噻唑偶氮)-3-羟基苯甲酸[4-(6′-bromobenzothiazolylazo)-3-hydroxyben-zoic Acid,Br-BTAHA]是 Cu^(2+)、CO^(2+)、Ni^(2+)的很好的显色剂和酸碱指示剂。用 Br-BTAHA 和 Cu-Br-BTAHA 作指示剂,以 EDTA 分别滴定 Cu^(2+)、Co^(2+)、Ni^(2+)及 Co^(2+)、Ni^(2+)、Zn^(2+)、Cd^(2+)、Pb^(2+),终点由蓝色分别突变为绿(或橙)色及黄绿(或橙红)色,十分清晰敏锐。根据 Ringbom 误差公式计算,Br-BTAHA 完全具备配位滴定指示剂的各项必要条件,是一种选择性和准确度均好的指示剂。
4-(6-Bromobenzothiazolylazo)-3-hydroxyben-zoic acid(Br-BTAHA)is a very good colorreagent for Cu^(2+),Co^(2+) and Ni^(2+),it is also anideal acid-base indicator.Direct titrations with EDTA can be carriedout on Cu^(2+),Co^(2+) Ni^(2+) cations and Co^(2+),Ni^(2+),Zn^(2+),Cd^(2+),Pb^(2+)cations using Br-BTAHA andCu-Br-BTAHA indicators respectively At theend point the color of the solution suddenlychanges from blue to green(or orange)andyellowish-green(or orange red)respectively.The color change is very sharp.
出处
《化学试剂》
CAS
CSCD
北大核心
1989年第2期103-105,共3页
Chemical Reagents