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A simple and very sensitive kinetic fluorimetric method is reported for the determination of trace amount of thiocyanate. The proposed method is based on the inhibition effect of thiocyanate on oxidation of rhodamine 6G by potassium bromate in sulfuric acid solution. The detection limit for thiocyanate is 1.63 x 10(-6) mmol/l. The linear range of the determination is 4.82 x 10(-6)-4.13 x 10(-5) mmol/l. This method has been used to determine trace thiocyanate in urine and saliva of smokers and non-smokers. The results obtained are satisfactory.
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