Abstract
A new, efficient and environmentally friendly method was developed for the analysis of methyl centralite (MC) and ethyl centralite (EC) in propellant using nanostructured supramolecular solvent microextraction. Several conditions affecting extraction efficiency such as the concentration of major components of the nanostructured supramolecular assembly (tetrahydrofuran and alkanol), alkanol type, solvent pH, and extraction time were investigated and optimized as well. High extraction efficiency of analytes was resulted from different types of interaction provided by the supramolecular assembly (e.g., hydrophobic and hydrogen bonds) and the high number of solubilization sites it contains. Besides simplicity and high efficiency, low-cost, environment-friendly, the system setup was implemented using conventional laboratory equipment. Under the optimal conditions, the detection limits of MC and EC in propellant samples were reported 0.007 and 0.010 mg g−1, respectively. Linear dynamic range of MC and EC is 0.04–10.00 mg g−1 with coefficient of determination (R2) of 0.9982 and 0.9997, respectively. The relative standard deviations under intra-day and inter-day conditions varied within the intervals 7.2–10.3 % and 7.6–11.2 %, respectively. Also, recoveries in samples ranged between about 89.5 and 97.3 %.
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