Analytical Sciences

Abstract − Analytical Sciences, 34(2), 243 (2018).

Droplet-counting Microtitration System for Precise On-site Analysis
Susumu KAWAKUBO,* Taichi OMORI,* Yasutada SUZUKI,** and Ikuo UETA*
*Graduate School, Faculty of Engineering, University of Yamanashi, Takeda, Kofu 400-8510, Japan
**Graduate School, Faculty of Life and Environmental Sciences, University of Yamanashi, Takeda, Kofu 400-8510, Japan
A new microtitration system based on the counting of titrant droplets has been developed for precise on-site analysis. The dropping rate was controlled by inserting a capillary tube as a flow resistance in a laboratory-made micropipette. The error of titration was 3% in a simulated titration with 20 droplets. The pre-addition of a titrant was proposed for precise titration within an error of 0.5%. The analytical performances were evaluated for chelate titration, redox titration and acid-base titration.