Sampling And Analysis Of Methyl Tert-Butyl Ether In Soil Samples Using A Solid-Phase Microextraction Fiber Prepared With In Situ Method By Metal−Organic Framework@Conductive Polymer Nanocomposite

The abundant use of Methyl tert-butyl Ether (MTBE) as an oxygen additive to gasoline can cause environmental pollution. So, to monitoring amount and provide applications for removal from environment, require practical methods to quantifying concentrations MTBE.In this work, a simple, fast and efficient method for sampling and analysis a major volatile pollutant in soil has been introduced. We used the HS-SPME-GC-FID method to sampleing, extraction and determination of MTBE in soil, and, by introducing a new absorbet, we promoted the performance of the method. The MIL-101(Cr) (as a Metal−Organic Framework) and pyrrol (as a conductive polymer) were used to coated the surface of a stainless steel fiber by the new nanocomposite as PPy @ MIL-101 (Cr) via an in-situ electropolymerization. The properties nanocomposite were characterized by SEM and FTIR analysis. The optimal extraction conditions, i.e., extraction temperature, extraction time, desorption time, and desorption temperature were determined. Under the optimal experimental conditions, the method showed good analytical efficiency for extraction and concentration of the analyte from soil matrix. The calibration curve was linear over the range of (5–40000) ng g-1, R2> 0.994). The LOD and LOQ were obtained 0.01ng g-1 and 0.4 ng g-1 respectively. Also, the fiber repeatability and reproducibility were determined. The method for extracting and measuring MTBE was tested in 6 real soil samples. Comparison of experimental results fiber with the commercial types, demonstrated the superiority of the proposed fiber for measuring MTBE. Experimental results showed the PPy@MIL-101(Cr) nanocomposite can be an appropriate coating with good sensitivity for analysis of MTBE as a volatile organic component (VOC) in environment.