Liquid-phase microextraction based on two immiscible organic solvents followed by gas chromatography with mass spectrometry as an efficient method for the preconcentration and determination of cocaine, ketamine, and lidocaine in human urine samples

2014 ◽  
Vol 37 (17) ◽  
pp. 2364-2371 ◽  
Author(s):  
Yadollah Yamini ◽  
Shahram Seidi ◽  
Rouhollah Feizbakhsh ◽  
Tahmineh Baheri ◽  
Maryam Rezazadeh
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