Exploring Polypyrrole as Extraction Phase for Disposable Pipette Extraction Method for Multiclass Organic Micro-Pollutant Determination in River and Tap Water Using Gas Chromatography-Mass Spectrometry

The use of a polypyrrole (PPy) is described as an efficient extraction phase for disposable pipette extraction (DPX), in a fast and ruggedized analytical method for simultaneous determination of 18 organic micro-pollutants in water using gas chromatography-mass spectrometry (GC-MS). The DPX-blank pipettes were filled with PPy. a material produced through the chemical polymerization of PPy using iron(III) chloride hexahydrate. The optimized conditions were 5 extraction cycles with 600 mu L of sample, adjusted to pH 9. and desorption with 150 mu L of ethyl acetate using 7 cycles with the same aliquot. The calibration curves resulted in determination coefficient (R-2) higher than 0.9963, the limit of detection (LOD) ranged from 0.4 to 1.5 mu g L-1, and the limit of quantification (LOQ) were from 1.4 to 5.0 mu g L-1. Excellent results were obtained for repeatability (2.3 to 15%, for 5 mu g L-1) and intermediate precision, varying the day of analyses (3.9 to 15.5%) and the pipette tip (3.4 to 22.4%). The anal yte recovery ranged from 75.4 to 115.0% for river water, and from 74.9 to 116.2% for tap water, in three different levels of concentration. The DPX-GC-MS method with PPy was successfully applied to determine the 18 analytes in river and tap water from the cities of Joinville and Florianopolis, Santa Catarina, Brazil.