Add time:08/03/2019         Source:sciencedirect.com

Publisher SummaryThis chapter discusses about the determination of thiocyanate and thiosulfate. Several methods are used for the analytical determination of inorganic thiocyanate. These include procedures based on the formation of colored complexes, either with ferric ions or with cupric ions and pyridine, or on oxidation with bromine followed by determination of the product cyanogen bromide. An ion-selective electrode for thiocyanate analysis is also marketed, but its use is often limited by the presence of interfering ions. Similarly, inorganic thiosulfate is determined by a variety of methods, including both the traditional iodometric titration and exhaustive cyanolysis followed by determination of the resulting thiocyanate. Thiosulfate may also be readily determined polarographically. In each case, the choice of method ordinarily rests on the nature of the sample to be analyzed, but the following procedures, both based on the formation of the red ferric thiocyanate complex ion, are found most generally useful and convenient. Thiocyanate itself requires only treatment with a soluble ferric salt in acid solution. Thiosulfate is subjected to quantitative cyanolysis in the presence of cupric ions prior to the ferric treatment.

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