Optimization of Conditions of the Electrochemical Detection of Methamphetamine†

doi:10.7503/cjcu20160139

Abstract

Abstract:

Electrochemical method was used to detect methamphetamine(MA) and the effects of different detection conditions, such as the scan speed, the initial concentration of MA, pH value, electrode processing temperature and disruptors, on the electrochemical detection of MA were investigated to find out the optimal conditions for the electrochemical detection of MA. The results show that with BDD thin film electrode as the working electrode and at a scan rate of 50—100 mV/s, initial concentration of lower than 100 mg/L, pH=7.0 and electrode processing temperature of 100 ℃, the detection rate of MA is the fastest with best results, and the disruptors have no obvious effect on the detection of MA.

Key words: Electrochemical method, Methamphetamine(MA), Cyclic voltammetry(Ed.: S, Z, M)

CLC Number:

O657.1
O646

TrendMD:

ZHANG Xuena, ZHONG Xinwen, ZHONG Yan, LU Haiyan. Optimization of Conditions of the Electrochemical Detection of Methamphetamine^†[J]. Chem. J. Chinese Universities, 2016, 37(10): 1799.

Figures/Tables 9

Fig.1 Cyclic voltammograms of BDD film electrode in 10.0 mmol/L PBS buffer solution(a) and 10.0 mmol/L PBS+100 mg/L MA solution(b)

Fig.2 Cyclic voltammograms of BDD film electrode at different positive scan rates in 10.0 mmol/L PBS+100 mg/L MA solutionScan rate/(mV·s-1): a. 5; b. 20; c. 50; d. 100.

Fig.3 Relationship between the peak current density and the square root of the scan rate on BDD film electrode in 10.0 mmol/L PBS+100 mg/L MA solution

Fig.4 Cyclic voltammograms of BDD film electrode in different MA solutions at 100 mV/sConcentration of MA solution/(mg·L-1): a. 20; b. 40; c. 60; d. 80; e. 100.

Fig.5 Relationship between peak current density and concentration of MA on BDD film electrode at 100 mV/s

Fig.6 Effect of different pH value of MA solution on peak current density of BDD film electrodeSolution: 10.0 mmol/L PBS+100 mg/L MA.

Fig.7 Effect of processing temperature of electrode on CV curves of BDD film electrode in MA solutionSolution: 10.0 mmol/L PBS+100 mg/L MA. t/℃: a. 80; b. 150; c. 200; d. 100; e. 300; f. 500.

Fig.8 Effect of disruptor on CV curve of BDD film electrode in MA solutiona. 10.0 mmol/L PBS+100 mg/L MA; b. 10.0 mmol/L PBS+100 mg/L MA+100 mg/L AMP+100 mg/L MDMA.

Fig.9 Forward scanning CV curve of real sample on BDD film electrode at 50 mV/s

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