Analytical Sciences

Abstract − Analytical Sciences, 30(4), 507 (2014).

Sequential Injection Analysis of Thiocyanate Ions Using a Microfluidic Polymer Chip with an Embedded Ion-Selective Electrode
Benjaporn TOSSANAITADA,* Takashi MASADOME,* and Toshihiko IMATO**
*Department of Applied Chemistry, Faculty of Engineering, Shibaura Institute of Technology, Toyosu, Koto, Tokyo 135-8548, Japan
**Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
A sequential injection analysis (SIA) system for the determination of SCN ion using a microfluidic polymer chip with an embedded SCN ion-selective electrode (SCN-ISE) as a detector was developed. Under the optimal flow conditions of the SIA system, the SCN-ISE showed a good linear relationship between peak heights and logarithmic concentrations of SCN ion with a Nernstian slope of 59.4 ± 3.8 mV decade−1 in a concentration range from 1.0 × 10−5 to 1.0 × 10−1 mol dm−3. Sample throughput of the present system for the determination of SCN ion was approximately 12 samples h−1. The proposed SIA system was applied to the determination of the level of SCN ion in human saliva samples.