A flow-through spectrophotometric bulk optode for the flow-injection determination of thiocyanate is described. As active constituents, the optode incorporates the lipophilized pH indicator 5-octadecanoyloxy-2-(4-nitrophenylazo)phenol and methyltridodecyl ammonium chloride, dissolved in a plasticized poly(vinyl)chloride membrane entrapped in a cellulose support. The optode is applied, in conjunction with the flow injection technique, to the determination of thiocyanate at pH 7.5 (TRIS/H2SO4). The sensor is readily regenerated with a 10-2 M NaOH carrier solution. The analytical characteristics of this optode with respect to thiocyanate response time, dynamic measurement range, reproducibility and selectivity are discussed. The proposed FI method is applied to the determination of thiocyanate in waters from different sources and in human saliva samples in order to distinguish between smokers and non-smokers.
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机译:描述了一种用于分流测定硫氰酸酯的流通式分光光度体光电二极管。作为活性成分,Optode掺入了脂溶化的pH指示剂5-十八碳酰氧基-2-(4-硝基苯基偶氮)苯酚和甲基三十二烷基氯化铵,溶于溶于纤维素载体的增塑聚氯乙烯膜。该光电二极管与流动注射技术一起用于测定pH 7.5(TRIS / H 2 sub> SO 4 sub>)中的硫氰酸盐。传感器易于用10 -2 sup> M NaOH载体溶液进行再生。讨论了该光电极在硫氰酸盐响应时间,动态测量范围,重现性和选择性方面的分析特性。所提出的FI方法可用于测定不同来源的水和人类唾液样品中的硫氰酸盐,以区分吸烟者和非吸烟者。
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