Sensitive Electrogenerated Chemiluminescence Sensor for Determination of Heroin
An electrogenerated chemiluminescence ( ECL) sensor was fabricated by employing ruthenium complex polymer as ECL signal and ionic liquid as binding reagent and a sensitive ECL method for the determination of heroin was developed. The ECL sensor was prepared by thoroughly mixing ruthenium complex polymer,graphite powder and ionic liquid,which shows good electrochemical and ECL behaviors. The detection limit for tripropylamine ( TPA) was one order of magnitude lower than that observed at the paraffin modified carbon paste electrode. ECL intensity of the fabricated sensor was greatly enhanced in the presence of heroin and a sensitive ECL method was proposed for the determination of heroin based on the enhancement ECL. The ECL intensity was linear with the concentration of heroin in the range from 2. 0 × 10 -9 mol/L to 2. 0 × 10 -5 mol/L and the detection limit was 8 × 10 -10 mol/L. The ECL sensor exhibited a long-term stability,fine reproducibility with relative standard deviation less than 5% for 5. 0 × 10 -9 mol/L heroin in 60 continuous determinations. The developed method allows the detection of heroin in a serum sample with recovery in 94%-101%.