“…Over past few decades, various sample pretreatment techniques, such as Soxhlet extraction, supercritical fluid extraction, ultrasonication-assisted extraction, liquid-phase microextraction and solid phase extraction, were developed for clean-up and enrichment of environmental pollutants [ 9 , 10 , 11 , 12 , 13 ]. Owing to easy operation, excellent adsorption performance and plenty of materials able to be used as sorbents, solid phase-based extraction techniques, including conventional solid phase extraction [ 14 ], dispersive solid phase extraction [ 15 , 16 , 17 ], magnetic solid phase extraction [ 18 , 19 , 20 , 21 ], stir bar sorptive dispersive microextraction [ 22 ] and solid-phase microextraction (SPME) [ 23 , 24 , 25 , 26 ] received considerable attention in environmental and biological analysis.…”