Preparation of novel electrospun nanofibers for extraction two herbisides (Atrazine and Ametrin) and determination of trace amount of them with ionic mobility spectrometer (IMS) in various real samples

Atrazine (AT), ۲-chloro-۴-(ethylamine)-۶(isopropylamine)-s-triazine and Ametrine (AMT), (N۲-ethyl-N۴-isopropyl-۶-methylthio-۱,۳,۵-triazine-۲,۴-diamine) are herbicides which have been used widely sofar [۱] . Due to their effect on human health and environment, their determination in real samples such as water, vegetables, and milk are essential [۲,۳]. To decrease matrix effect, sample preparation is necessary. Sorbents play significant role in sample preparation methods. Electrospun nanofibers with prominent features like large specific surface area and high prosity are excellent candidate as sorbents. Here, the electrospun composite of poly vinyl chloride/ethylene vinyl acetate/chitosan/starch (PVC/EVA/CS/Str) was prepared and used as promising in micro solid phase extraction of AT and AMT prior to CD-IMS analysis. From the evaluation of FE-SEM, FT-IR, XRD and TGA,the synthesize of electrospun nanofibers was confirmed. Effective factors on adsorption and desorption steps was optimized with Design-Expert ۱۲.۰ software. under the optimize conditions, the calibration plots were linear in the range ۰.۰۰۸-۰.۳ ppm. Limits of detection of ۱.۶۸*۱۰-۵ ppm and ۴.۶*۱۰-۶ ppm were obtained for AT and AMT, respectively.