Development of a convenient polypyrrole based sorbent for headspace solid phase microextraction of diazinon and chlorpyrifos

A method for polypyrrole (PPy) fiber fabrication through a simple and quick one-step electrodeposition process was developed. 3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid was used as an anion dopant for the first time. It was applied for headspace-solid phase microextraction (HS-SPME) of diazinon (DZN) and chlorpyrifos (CPF). A gas chromatography equipped with mass spectrometry was employed for isolation and single ion monitoring of DZN and CPF. Under optimal conditions, linear regressions in the concentration ranges of 0.25-300 ng mL(-1) (R-2 > 0.99) were achieved. The limits of detection of DZN and CPF were found to be 0.02 and 0.03 ng mL(-1), respectively. The developed HS-SPME was employed for analysis of DZN and CPF in five real samples (well water, commercial apple and grape juices, and natural apple and tomato juices). The attained relative recovery values (94.2-104.4 %) verified that this methodology has acceptable capability to determine trace amounts of organophosphorus presides in real samples.

Automated summary

A new method for fabricating polypyrrole fibers through a one-step electrodeposition process was developed, using 3-hydroxy-4-nitroso-2,7-naphthalenedisulfonic acid as an anion dopant for the first time. This method was applied for the analysis of diazinon and chlorpyrifos, showing good analytical performance and recovery rates.