## 4 Conclusions  
A simple and economical SPME fiber was synthesized by the one-pot method, with divinylbenzene, porous carbon powder and polydimethylsiloxane as raw materials. The \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Analyte**} & \multirow{2}{*}{\
\begin{tabular}{c} **Quantification** \\ **Ions** \\ \end{tabular} } &
\begin{tabular}{c} **Linear** \\ **Range** \\ **(ng/L)** \\ \end{tabular} & \multirow{2}{*}{**Linear Equation**} & \multirow{2}{*}{**R\({}^{2}\)**} & \multirow{2}{*}{**LOD a**} & \multirow{2}{*}{**LOQ b**} & \multirow{2}{*}{**RSD(\%)**} \\  & & & & & & \(\rho\)**(ng/L)** & \(\rho\)**(ng/L)** & \(n=6\) \\ \hline dimethyl trisulfide & 126 & 10–1000 & y = 0.2533x \(-\) 0.2253 & 0.9935 & 3.0 & 10.0 & 2.8 \\ dimethyl disulfide & 94 & 10–1000 & y = 0.0956x \(-\) 0.1167 & 0.9956 & 5.0 & 20.0 & 3.3 \\ p-Cresol & 107 & 5–1000 & y = 0.9674x + 0.2662 & 0.9948 & 1.0 & 3.0 & 4.5 \\ Phenol & 94 & 5–1000 & y = 0.1534x + 0.1387 & 0.9987 & 1.0 & 3.0 & 8.7 \\
3-methylindole & 131 & 5–1000 & y = 0.0712x \(-\) 0.0034 & 0.9992 & 1.0 & 3.0 & 3.6 \\ \hline \hline \end{tabular}  
* Limit of detection for S/N = 3; b Limit of quantification for S/N = 10.  
\end{table} 
Table 1: Linear equation, correlation coefficient, limit of detection and RSD of the method. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Compounds**} & \multirow{2}{*}{\begin{tabular}{c} **Collecting Pool** \\ **(ng/L)** \\ \end{tabular} } & \begin{tabular}{c} **Regulating** \\ **Tank** \\ **(ng/L)** \\ \end{tabular} & \multirow{2}{*}{\
\begin{tabular}{c} **Reaction Tank** \\ **(ng/L)** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Outlet Pool** \\ **(ng/L)** \\ \end{tabular} } \\  & & & & \\ \hline Dimethyl & \(1.54\times 10^{6}\) & \(4.28\times 10^{4}\) & \(5.86\times 10^{2}\) & 17.0 \\ trisulfide & \(3.23\times 10^{6}\) & \(4.53\times 10^{4}\) & \(6.34\times 10^{2}\) & 22.3 \\ p-Cresol & \(5.23\times 10^{5}\) & \(6.43\times 10^{3}\) & \(5.26\times 10^{2}\) & 7.65 \\ Phenol & \(8.23\times 10^{5}\) & \(9.36\times 10^{3}\) & \(7.96\times 10^{2}\) & 9.03 \\
3-Methylindole & \(1.03\times 10^{4}\) & \(6.38\times 10^{2}\) & 84.5 & 2.51 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Detection results and recoveries of volatile metabolites in water samples (\(n=3\)). results showed that the synthesized coating has good thermal stability and high extraction efficiency. The SPME fiber was applied to the analysis of volatile organic compounds in landfill leachate, and a total of 91 volatile compounds were identified, including sulfide, aromatics, alcohols, nitrogen compounds, esters, alkanes, ketones, terpen, acids, aldehydes and so forth. Compared with the commercial fiber (DVB/CAR/PDMS), the self-made fiber (DVB/Carbon/PDMS) had higher quantity and content of extract, and it was simpler in preparation and cost-efficient. For the analysis of five typical hazardous substances, in the concentration range of 10.0-1000 ng/L, a good linearity (r > 0.998) was obtained, with their detection limits in the range of 0.30-0.50 ng/L, and recoveries at the concentration level of 50 ng/L were 76.3-93.0%. The new method exhibited good precision, with RSD values of less than 12.7%. Therefore, the prepared solid phase microextraction fiber can be used for rapid detection and analysis of hazardous odorants in the environment. The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/pr10061045/s1](https://www.mdpi.com/article/10.3390/pr10061045/s1)]([https://www.mdpi.com/article/10.3390/pr10061045/s1](https://www.mdpi.com/article/10.3390/pr10061045/s1)), Figure S1: A comparison of FT-IR diagram of: (a) commercial PDMS/CAR/DVB, (b) self-made PDMS/Carbon/DVB; Figure S2: Amplified total ion chromatograms of VOCs from landfill leachate obtained from: (a) prepared PDMS/Carbon/DVB fiber; (b) the commercial DVB/CAR/PDMS fiber.