## 3 Results
### The Analytical Figures of Merit
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{3}{*}{**Analytes**} & \multirow{3}{*}{\begin{tabular}{c} **Linear Range** \\ **(\(\upmu\)g\(\cdot\)L\({}^{-1}\))** \\ \end{tabular} } & \multirow{3}{*}{\begin{tabular}{c} **R\({}^{2}\)** \\ **(\(\upmu\)g\(\cdot\)L\({}^{-1}\))** \\ \end{tabular} } & \multirow{3}{*}{\begin{tabular}{c} **LODs** \\ **(\(\upmu\)g\(\cdot\)L\({}^{-1}\))** \\ \end{tabular} } & \multicolumn{3}{c}{**Inters-Day**} & \multirow{3}{*}{\begin{tabular}{c} **Hers-Day** \\ **(\(\upmu\)g\(\cdot\)L\({}^{-1}\))** \\ \end{tabular} } & \multirow{3}{*}{\
\begin{tabular}{c} **Fiber-to-Fiber** \\ **(\(\upmu\)g\(\cdot\)L\({}^{-1}\))** \\ \end{tabular} } & \multirow{3}{*}{
\begin{tabular}{c} **EFs \({}^{*}\)** \\ **(\(\upmu\)g\(\cdot\)L\({}^{-1}\))** \\ \end{tabular} } \\  & & & & & **a** & **b** & **a** & **b** & \\ \hline DIBP & 0.20–300 & 0.9932 & 0.20 & 0.67 & 4.1 & 9.3 & 4.3 & 8.7 & 8.4 & 840 \\ DBP & 0.04–100 & 0.9964 & 0.04 & 0.13 & 8.0 & 5.2 & 6.3 & 3.8 & 9.9 & 1068 \\ DPP & 0.30–100 & 0.9973 & 0.30 & 0.99 & 11.8 & 12.1 & 7.3 & 12.3 & 4.5 & 2657 \\ BBP & 0.44–500 & 0.9928 & 0.44 & 1.46 & 9.1 & 12.9 & 7.9 & 11.9 & 2.3 & 559 \\ DEHP & 0.39–500 & 0.9945 & 0.39 & 1.30 & 10.5 & 12.5 & 3.9 & 14.1 & 7.5 & 268 \\ \hline \hline \end{tabular}  
* The enrichment factor (EF) for this experiment was calculated using \(\text{EF}=\frac{S_{DBP}\times 100}{S_{DI}}\). \(S_{DI}\) refers to the peak area obtained by the direct injection of 1 \(\upmu\)d of a mixture that contained DIBP 3000 \(\upmu\)g\(\cdot\)L\({}^{-1}\), DBP and DPP 1000 \(\upmu\)g\(\cdot\)L\({}^{-1}\), \(S_{SPME}\) refers to the peak area measured using the SPME-GC method from a 20 mL mixture that contained 30 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DIBP, 10 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DBP and DPP, and 50 \(\upmu\)g\(\cdot\)L\({}^{-1}\) BBP and DEHP: a 30 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DIBP, 10 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DBP, 10 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DPP, 50 \(\upmu\)g\(\cdot\)L\({}^{-1}\) BBP and 50 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DEHP: b: 15 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DIBP, 5 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DBP, 5 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DEP, 25 \(\upmu\)g\(\cdot\)L\({}^{-1}\) BBP and 25 \(\upmu\)g\(\cdot\)L\({}^{-1}\) DEHP.  
\end{table} 
Table 2: The analytical performance of the TPB-DMTP-GS-SSF for the SPME of the PAEs. Figure 7: The chromatogram of the five PAEs in the optimized conditions. Extraction solution: a mixture that contained DIBP 30 \(\upmu\)g\(\cdot\)L\({}^{-1}\), DBP and DPP 10 \(\upmu\)g\(\cdot\)L\({}^{-1}\), and BBP and DEHP 10 \(\upmu\)g\(\cdot\)L\({}^{-1}\). The extraction conditions: extraction time, 30 min; extraction temperature, 35 \({}^{\circ}\)C; agitation speed, 250 rpm; salt concentration, 5%. The desorption conditions: desorption time, 2 min; desorption temperature 280 \({}^{\circ}\)C.  
for the PAEs was observed on the COF-TPB-DMTP-coated fiber even after 180 cycles of extraction/desorption. In order to verify the selectivity and the extraction efficiency of the prepared TPB-DMTP-GS-SSF, two kinds of commercial SPME fibers (PDMS and DVB/CAR/PDMS coating fibers), the GS-SSF and the TPB-DMTP-GS-SSF were also employed to extract the PAEs in water (Figure 8c). The TPB-DMTP-GS-SSF gave sound EFs from 268 to 2657, which were higher than the ones of the GS-SSF from 69 to 1036, the ones of the PDMS fiber from 72 to 1958 and the ones of DVB/CAR/PDMS fiber from 141 to 2516. For a further comparison of the enrichment capacity, the average percentage increase calculations were carried out and the results shown in Table S1. It was found that all the average percentage increases in the EF of the TPB-DMTP-GS-SSF were over 4.46%. The above results reveal the significant potential of the prepared TPB-DMTP-GS-SSF for the extraction of PAEs. A summary of the comparative study of the developed method with other reported methods for the determination of the PAEs in various samples are shown in Table 3.