Citation: LIU Song-Hao, ZANG Xiao-Huan, CHANG Qing-Yun, LIANG Wei-Qian, WU Tong, WANG Chun, WANG Zhi. ZIF-8 Derived Nitrogen-Containing Porous Carbon as Adsorbent for Solid-Phase Extraction of Six Metal Ions from Tea samples[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(8): 1282-1288. doi: 10.11895/j.issn.0253-3820.171193
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A metal organic skeleton ZIF-8 derived nitrogen-containing porous carbon (ZIF-8-NC) was used as the adsorbent for the solid-phase extraction of Cu2+, Pb2+, Cd2+, Cr3+, Ni2+, Co2+ from tea samples prior to flame atomic absorption spectrometric detection. The ZIF-8-NC had a large specific surface area of 1240 m2/g due to the presence of plenty of micropores and mesopores. Its high adsorption capability could be attributed to the surface nitrogen-containing groups which coordinated with metal ions. The effects of important experimental parameters on the extraction efficiency were investigated and optimized. Under the optimal conditions, the limits of detections (LODs) were found to be 0.05-0.07 μg/kg. The correlation coefficients were between 0.9988 and 0.9993. The method recoveries of the analytes in the spiked samples were 76.8%-101.0%, with relative standard deviations ranging from 5.9% to 11.3%. The established method provides a new and environmentally friendly approach for determination of metal ions in complex matrix samples.
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