Determination of Organochlorine Pesticides in Water using Solidification of Floating Organic Drop Liquid Phase

【Abstract】 Objective To develop a new method for simultaneous determination of eight organochlorine pesticides (OCPs) in water samples using solidification floating organic drop liquid-phase microextraction (SFO-LPME) combined with gas chromatography-electronic capture detector (GC-ECD). Methods The experimental conditions of SFO-LPME were determined with n-Hexadecane as extractant, water samples adjusted to pH 6.0, inonic strength increased by adding 15.0 g/100 mL NaCl. The OCPs were extracted at 55℃ for 10 min and determined with GC-ECD. Results A good linearity (correlation coefficients ≥0.996) was obtained for eight target compounds from 5 ng/L to 100 ng/L. The method detection limits ranged from 0.24 ng/L to 0.78 ng/L. Satisfactory results were achieved with samples of river water, piped water and farmland water, with an average recovery of 76.0%-106.0% and \RSD of 3.24%-11.60%. Conclusion The proposed method is rapid, simple and sensitive. It is suitable for batch analyses of eight organic chlorine pesticides in water samples.