Rapid detection of atrazine and its metabolite in raw urine by extractive electrospray ionization mass spectrometry

Herbicides such as atrazine are widely used in the biosphere. Urine analysis is usually performed to evaluate the toxicological effects associated with atrazine exposure. A simple procedure based on the extractive electrospray ionization mass spectrometry (EESI-MS) method was established to detect atrazine and its metabolites in undiluted raw urine without sample pretreatment. A 4.3x 10(-14) g atrazine in spiked raw urine was detected and identified by EESI/MS/MS/NlS. The detection limit was found to be 0.4 fg for atrazine (m/z 174) and 0.2 fg for 2-chloro-4, 6-diamino-S-triazine (DACT) (m/z 129) (S/N = 3) in EESI/MS/MS. A linear dynamic range of 4-5 orders of magnitude (r = 0.996) was determined for both atrazine and DACT. A single sample analysis was completed using tandem EESI-MS/MS within I min, providing a practical convenient method for rapid analysis of trace amounts of targeted metabolites present in complex matrices. Thus, tandem EESI-MS is potentially useful for previously discovered biomarker detection in multiple applications such as clinical diagnosis, drug discovery and forensic science.