1990 年 6 巻 6 号 p. 893-898
A macromolecular ion flotation method has been developed for preconcentration of thiocyanate using carboxymethylcellulose (CMC) and hexadecyltrimethylammonium chloride (HTAC), followed by spectrophotometric determination of the thiocyanate floated as the iron(III)-thiocyanate complex. The optimum conditions for macromolecular ion flotation of thiocyanate were established by varying the amounts of CMC used as a macromolecular anion and of HTAC used as a cationic surfactant, and by controlling the flow rate of nitrogen gas bubbled through the solution containing thiocyanate and flotation reagents. When 200-ml and 400-ml sample solutions were used, thiocyanate was concentrated 23.4-fold and 46.1-fold, respectively. The proposed method gave a linear calibration graph for thiocyanate and could be applied to the determination of thiocyanate in the concentration range 9×10-8 -1×10-5M in the case of 200-ml sample solution. The relative standard deviation was 0.50% at the 6×10-6M thiocyanate level.
