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Determination of Heroin Based on Analyte Pulse Perturbation to an Oscillating Chemical Reaction
Authors:REN Jie  GAO Jin-zhang  Suo-nan  ZHAO Guo-hu  YANG Wu  U Dong-yu  SUN Kan-jun  LI Chong-yang
Abstract: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.
Keywords:Heroin  Analyte pulse perturbation technique (APP)  Mechanism  Continuous-flow stirred tank reactor(CSTR)
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