摘要
对EDTA络合滴定法测定硬度的铬黑T(EBT)指示剂进行了研究.通过铬黑T溶液吸光性的测定,对铬黑T各种液体体系的溶解性、稳定性进行了探讨,找到了0.1%EBT-20%NH3-NH4Cl-0.1%PVP乙醇溶液的稳定体系,并将其应用于自来水中总硬度的测定,终点颜色变色敏锐,平行测定结果好,精密度高.并与固体指示剂进行了对比.
The Eriochrome Black T（EBT） indicator in EDTA complex metric titration is studied. Through detecting the absorbance of EBT solution, the dissolubility and stability are discussed. At last, the stable solution system, that is 0.1% EBT - 20 % NH3 - NH4Cl - 0.1% PVP alcohol solution is found. This stable solution was applied in detecting the total hardness of running water. At the end, the color changes are sharp, the parallel detection datas are close and precise. At the same time, we made the contrast experiments with solid EBT indicator.
出处
《北京建筑工程学院学报》
2007年第1期49-51,共3页
Journal of Beijing Institute of Civil Engineering and Architecture
关键词
铬黑T(EBT)
液体指示剂
稳定性
络合滴定
Eriochrome Black T（EBT）
indicator solution
stability
complex metric titration
