高等学校化学研究 ›› 2004, Vol. 20 ›› Issue (5): 534-538.
REN Jie1, GAO Jin-zhang1, Suo-nan1, ZHAO Guo-hu1, YANG Wu1, LÜ Dong-yu1, SUN Kan-jun1, LI Chong-yang2
REN Jie1, GAO Jin-zhang1, Suo-nan1, ZHAO Guo-hu1, YANG Wu1, LÜ Dong-yu1, SUN Kan-jun1, LI Chong-yang2
摘要: A new analytical method is proposed for the determination of heroin based on a sequential perturbation caused by trace amounts of heroin in the Cu (Ⅱ)-catalyzed oscillating reaction between hydrogen peroxide and sodium thiocyanate in an alkaline medium with the aid of a continuous-flow stirred tank reactor (CSTR).The method relies on the linear relationship between the change in oscillation period of the system and the concentration of heroin, with a detecting limit of 4.0× 10-7 mol/L.The calibration curve fits a linear equation very well when the concentration of heroin is in the range of 2.0 × 10-6_ 1.2 × 10-5 mol/L (r = 0.9971).This method features good precision(RSD= 0.98%).The influences of temperature, injection point, flow rate and reaction variables on the oscillation period were investigated in detail and a possible mechanism of the performance of heroin in the Cu( Ⅱ )-catalyzed oscillating reaction system is also discussed.The proposed method opens a new avenue for the determination of heroin.