2014 Volume 30 Issue 4 Pages 507-511
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.