Catalytic Analysis. V. Microdetermination of Sulphide, Thiosulphate and Thiocyanate with the Fluorescence Indicator

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Applying the catalytic behaviours of sulphide, thiosulphate and thiocyanate on the reaction : 2NaN_3+I_2 = 2NaI+3N_2, determinations of the microquantities of these catalysers were studied by the measurement of the velocity of the catalysed reaction using some fluorescence indicator. (1) Acidity of acetic acid in whose medium the reaction takes it's advance successfully was tested and discussed. (2) Applying the linear function between the reciprocal of the time required until the fluorescence of the solution containing the various amounts of the catalyser mathed with the standard and the amount of the catalyser, determination of 0.5γ〜10γ per ml of sulphide, 0.5γ〜3.5γ per ml of thiosulphate and 0.2γ〜6.0γ per ml of thiocyanate were made. (3) Rhodamine B and Trypaflavin were desirable as a fluorescence indicator. Starch was not adoptable. Effects of other ions, as chromic ion, chloride ion, sulphate ion and nitrate ion were tested and the microdeter-minations in presence of them were made successfully.
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