Development of a microfluidic approach to the analysis of carbamate pesticides in drinking water

During the last decade, public concern over carbamate pesticide residues has increased remarkably and their accurate determination in environmental samples is gaining great importance. These compounds are present in environmental samples at low concentration levels; one or several pre-concentration steps are therefore required to isolate the target analytes, bring them to an appropriate concentration level, and remove matrix interference components. This work describes the development of an analytical approach to ultimately allow the combined extraction and detection of eserine, as an example of a carbamate pesticide, within a single microfluidic device.The current study has been based on the use of the well-known approach using solid-phase extraction (SPE) for eserine sample preparation, with a silica-based monolith used as an SPE sorbent. A silica-based monolith rod was fabricated by the sol-gel process and modified with octadecyl groups for eserine extraction. This sorbent material was found to have a good surface area of approximately 312 m2 g·1 after the modification step. A high extraction efficiency of 96.58% recovery was demonstrated for eserine using the octadecylated silica monolith. The SPE approach was rapid, taking less than I0 min, and used a low volume of sample of 300 μL.In this study, a very sensitive and rapid microfluidic-chemiluminescence method was developed for the determination of eserine. To the researcher's knowledge, there has been no published data to date in the literature for the determination of eserine by a chemiluminescence method