This work describes a simple and reliable colorimetric method based on the gold nanoparticles without any modification, which can realize the rapid, sensitive, and quantitative detection of lead (Pb2+) and copper (Cu2+) ions, providing a reference for monitoring metal ions in the environmental water. When Pb2+ was added to the gold nanoparticles solution containing a low concentration of L‐Cysteine, the combination of Pb2+ and L‐Cysteine can induce the aggregation of gold nanoparticles. On the contrary, Cu2+ can catalyze the oxidation of L‐Cysteine and destroy the formation of the Au‐S bond between L‐Cysteine and gold nanoparticles, thereby preventing the aggregation of gold nanoparticles. As the ultraviolet‐visible spectrum of gold nanoparticle solution is closely related to their aggregation status, the Cu2+ and Pb2+ can be determined. The calibration curves, which are constructed based on ratios of the absorbance at 650 nm and 520 nm of gold nanoparticles, display good linearity in the range of 50.0−2.5 × 103 nM for Pb2+ and 25.0−300.0 nM for Cu2+, respectively. The limits of quantitation of Pb2+ and Cu2+ are determined to be 50.0 and 25.0 nM, respectively. In addition, the spiked recoveries of Pb2+ and Cu2+ in real water samples are 94.6−112.5 and 87.3−114.7% with a relative standard deviation of less than 6.3%, respectively.

A magnetic porous carbon NH 2 -MIL-101-C was synthesized through a one-step carbonization process using NH 2 -MIL-101(Fe) as the precursor. The morphology, structure, magnetic behavior, and porosity of the as-prepared NH 2 -MIL-101-C were characterized. The results show that NH 2 -MIL-101-C has a high Brunauer-Emmett-Teller surface area (213.7 m 2 /g), a large pore volume (0.2 m 3 /g), and a good magnetic property (23.4 emu/g). The NH 2 -MIL-101-C was first used as a magnetic solid-phase extraction adsorbent for the extraction of five anthraquinones from rhubarb. The main parameters that will affect the extraction efficiency were investigated. Under the optimized conditions, good linearity for the five anthraquinones was obtained with the R 2 higher than 0.9910. The limits of detection and limits of quantitation for the analytes are 0.018−0.042 and 0.050−0.140 μg/mL, respectively.