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Sensors 2006, 6(10), 1224-1233; doi:10.3390/s6101224

Flow-through Bulk Optode for Spectrophotometric Determination of Thiocyanate and Its Application to Water and Saliva Analysis

Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, 30071 Murcia, Spain
Author to whom correspondence should be addressed.
Received: 23 June 2006 / Accepted: 3 October 2006 / Published: 9 October 2006
(This article belongs to the Special Issue Sensors in Flow Analysis)
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A flow-through spectrophotometric bulk optode for the flow-injectiondetermination of thiocyanate is described. As active constituents, the optode incorporatesthe lipophilized pH indicator 5-octadecanoyloxy-2-(4-nitrophenylazo)phenol andmethyltridodecyl ammonium chloride, dissolved in a plasticized poly(vinyl)chloridemembrane entrapped in a cellulose support. The optode is applied, in conjunction with theflow injection technique, to the determination of thiocyanate at pH 7.5 (TRIS/H2SO4). Thesensor is readily regenerated with a 10-2 M NaOH carrier solution. The analyticalcharacteristics of this optode with respect to thiocyanate response time, dynamicmeasurement range, reproducibility and selectivity are discussed. The proposed FI methodis applied to the determination of thiocyanate in waters from different sources and in humansaliva samples in order to distinguish between smokers and non-smokers. View Full-Text
Keywords: Flow-through optode; spectrophotometry; thiocyanate; water; saliva. Flow-through optode; spectrophotometry; thiocyanate; water; saliva.

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

García, S., Mª; Ortuño, J.A.; Sánchez-Pedreño, C.; Albero, I., Mª; Fernández, J., Mª. Flow-through Bulk Optode for Spectrophotometric Determination of Thiocyanate and Its Application to Water and Saliva Analysis. Sensors 2006, 6, 1224-1233.

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