当水、尿及血清中同时存在有氰化物及硫氰酸盐时,采用一般的方法是难以将二者分别测定的。Baar及Feldstein等曾介绍过微扩散法,可以分别测定CN~-及SCN~-,但需用特制玻璃仪器,且操作不便。我们根据氰化物在酸性溶液中极易逸出的特点,拟定了用氮气或空气将酸性溶液中的CN~-吹出,用稀NaOH溶液吸收的方法使CN~-和SCN~-分开而测定的方法。实践证明,本法简便,效果良好。近年来测定氰化物大都采用吡唑啉酮 When both cyanide and thiocyanate are present in water, urine and serum, it is difficult to determine the two separately using the usual method. Baar and Feldstein, etc. have introduced the micro-diffusion method can be measured CN ~ - and SCN ~ -, but the need for special glass instruments, and the operation inconvenience. According to the characteristics that cyanide can escape easily in acidic solution, we developed a method to separate CN ~ - and SCN ~ - by blowing out CN ~ - in acidic solution with nitrogen or air and absorbing it with dilute NaOH solution method. Practice has proved that this method is simple and effective. In recent years, most of the determination of cyanide using pyrazolone