## 4 Conclusions  
Spiny-like spherical copper metal-organic frameworks (SSC-MOFs) were fabricated as spheres with interconnected stalks and porous, crystalline structures. The developed SSC-MOFs possess rich surface functional groups, including N-H from an imidazole ligand. The porous structure of the fabricated SSC-MOFs leads to its high level of efficiency in microextracting arsenic(III) from various sample matrixes at a pH of 7, with a contact time of 10 min and using 0.05 M of HNO\({}_{3}\) as an eluent. The developed arsenic(III) microextraction procedure based on the fabricated SSC-MOFs exhibited high performance, with a recovery of no less than 90%, even in competitive environments including various ions such as NO\({}_{3}\)-, Cl-, F-, CO\({}_{3}\)2-, SO\({}_{4}\)2-, K+, Mg2+, Ca2+, Na+, Fe3+, Cr3+, Zn2+, Cd2+, Pb2+, Ni2+ and Cu2+. The successful application of the synthetized SSC-MOFs for the microextraction of arsenic(III) will encourage further future research studies on the synthesis and evaluation of metal-organic framework-derived adsorbents for the microextraction of other pollutants including dyes, pesticides and/or heavy metals. The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app131810036/s1](https://www.mdpi.com/article/10.3390/app131810036/s1)]([https://www.mdpi.com/article/10.3390/app131810036/s1](https://www.mdpi.com/article/10.3390/app131810036/s1)). Conceptualization, M.A.H. ; formal analysis, M.A.H., M.S. and S.O.A. ; investigation, M.A.H. and Z.A.A. ; methodology, Z.A.A., M.S. and S.O.A. ; resources, Z.A.A. ; validation, M.A.H., Z.A.A., M.S. and S.O.A. ; writing-original draft, M.A.H. ; writing-review and editing, M.A.H. and Z.A.A. All authors have read and agreed to the published version of the manuscript. This work was funded by the Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia for funding this research work through the project no. IFKSUOR3-446-2. Not applicable. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & & & & & & & & & & \\ \cline{3-10} \multirow{3}{*}{**Real Sample Kind**} & \multirow{3}{*}{**Detected**} & \multirow{3}{*}{**Applications**} & \multicolumn{3}{c}{**Additions/Recovery Investigations**} & & \\ \cline{3-10}  & & & **Spiking of** & & **Spiking of** & & & & & \\  & & **0.05 mg L\({}^{-1}\) & & **0.05 mg\({}^{-1}\)L\({}^{-1}\)** & & **1.0 mg\({}^{-1}\)L\({}^{-1}\)** & & **1.5 mg\({}^{-1}\)L\({}^{-1}\)** \\ \cline{3-10}  & & & & & & & & & & \\ \hline \multirow{3}{*}{**Fusion**} & Tap Water & BDL * & 0.049 \(\pm\) 0.002 & 98 & 0.495 \(\pm\) 0.001 & 99 & 0.999 \(\pm\) 0.020 & 100 & 1.486 \(\pm\) 0.015 & 99 \\ \cline{2-10}  & Ground Water & 0.005 \(\pm\) 0.001 & 0.050 \(\pm\) 0.005 & 100 & 0.491 \(\pm\) 0.009 & 98 & 0.984 \(\pm\) 0.015 & 98 & 1.487 \(\pm\) 0.020 & 99 \\ \cline{2-10}  & & Lettuce & BDL * & 0.048 \(\pm\) 0.001 & 96 & 0.499 \(\pm\) 0.010 & 100 & 0.987 \(\pm\) 0.005 & 99 & 1.49 \(\pm\) 0.018 & 99 \\ \cline{2-10}  & & Dill & BDL * & 0.048 \(\pm\) 0.005 & 96 & 0.489 \(\pm\) 0.005 & 98 & 0.957 \(\pm\) 0.014 & 96 & 1.489 \(\pm\) 0.005 & 99 \\ \cline{2-10}  & & Coriander & BDL * & 0.049 \(\pm\) 0.004 & 98 & 0.475 \(\pm\) 0.008 & 95 & 0.953 \(\pm\) 0.002 & 95 & 1.499 \(\pm\) 0.009 & 100 \\ \cline{2-10}  & & Parsley & BDL * & 0.046 \(\pm\) 0.004 & 92 & 0.495 \(\pm\) 0.001 & 99 & 0.94 \(\pm\) 0.009 & 94 & 1.5 \(\pm\) 0.012 & 100 \\ \cline{2-10}  & & Tomatoes & BDL * & 0.050 \(\pm\) 0.006 & 100 & 0.496 \(\pm\) 0.010 & 99 & 0.972 \(\pm\) 0.010 & 97 & 1.482 \(\pm\) 0.025 & 99 \\ \hline \hline \end{tabular}
* Below detection limits.  
\end{table} 
Table 3: The addition of certain concentrations of arsenic(III) and its recovery from some food and water samples (N = 3). **Informed Consent Statement:** Not applicable. **Data Availability Statement:** Samples of the compounds are available from the authors.