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.
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