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KMID : 0385520120250030159
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Analytical Science & Technology
2012 Volume.25 No. 3 p.159 ~ p.163
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Spectrofluorimetric determination of free cyanide ion with fluorescent safranine-O
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Choi Hee-Seon
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Abstract
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A spectrofluorimetric method has been developed for the determination of free CN? in real samples with fluorescent safranine-O. When safranine-O interacts electrostatistically with CN?, the fluorescent intensity of safranine-O is decreased. Several experimental conditions such as pH of the sample solution and the amount of safranine-O were optimized. Ag+ interfered higher than any other ions. Interference of Ag+ could be disregarded because Ag+
was scarcely contained or mostly complexed with CN? in selected real samples. With this proposed method, the linear range of CN? was from 5.0 to 110 ng/mL and the detection limit of CN? was 2.9 ng/mL. For validating this technique, real samples (Cu, Ag, Au electroplating wastewater, and untreated wastewater in university and in sewage treatment plant) were used. Recovery yields of 91.5%~106.0% were obtained. Based on experimental results, it is proposed that this technique can be applied to the practical determination of free CN?.
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KEYWORD
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CN-ion, safranine-O, spectrofluorimetry, electroplating wastewater
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