水晶発振検出器を用いる微量シアン化物イオンの簡易定量法

抄録

In the presence of hydrogen peroxide cyanide reacted with a gold electrode of a quartz oscillator to form cyano gold complex, and the dissolution of the gold resulted in the frequency change of the quartz oscillator. A minute amount of cyanide in solution could be determined by this method. Cyanide sample solution (50 ml, pH 10, 30 °C) containing 0.3 % hydrogen peroxide was flowed out on the both gold electrodes of the quartz oscillator at the rate of 2.50 ml/min with a peristaltic pump. After 20 min, the quartz oscillator was washed with water and acetone, and dried by flowing nitrogen gas, and the change of the frequency of the oscillator, F (Hz), was measured. The calibration curve was linear over the range of (2.0×10^-74.0×10^-6) M, and the relationship was given by an equation, [CN^-]=(F/19.2)×10^-7 M. The standard deviation was 11.7 Hz (3.5 %) for 5 determinations of 2.0×10^-6 M cyanide.