Abstract
Cadmium selenide (CdSe) quantum dots (QDs) were synthesized by water phase synthesis method using 3-mercaptopropionic acid (3-MPA) as a stabilizer, and they were applied to the detection of copper ions (Cu2+). The results showed that CdSe QDs have excellent selectivity and sensitivity toward Cu2+. The fluorescence intensity of CdSe QDs decreased with the increase of Cu2+ concentration. The linear range was from 30 nM to 3 μM, and the detection limit was 30 nM. Furthermore, CdSe QDs were used for detecting the concentration of Cu2+ in oysters. The content of Cu2+ was 40.91 mg/kg, which was close to the one measured via flame atomic absorption spectrometry (FAAS), and the relative error was 1.81%. Therefore, CdSe QDs have a wide application prospect in the rapid detection of copper ions in food.
Highlights
During the last few decades, industrial and urban activities have caused the increase of metal contamination on the marine environment and have had negative ecological effects on coastal ecosystems
Cadmium selenide (CdSe) quantum dots (QDs) were synthesized by aqueous inorganic method using 3-mercaptopropionic acid (3-MPA) as a stabilizer, and measured their selectivity and sensitivity toward Cu2+
The microscopic characteristics of CdSe QDs were determined via high-resolution transmission electron microscope (HRTEM, JEOL JEM-2200FS, Tokyo, Japan) under 200 kV
Summary
During the last few decades, industrial and urban activities have caused the increase of metal contamination on the marine environment and have had negative ecological effects on coastal ecosystems. Traditional methods of copper ion (Cu2+ ) detections mainly include atomic absorption spectrometry (AAS), inductively coupled mass spectroscopy (ICP-MS), and inductively coupled atomic emission spectroscopy (ICP-AES) [10,11]. These methods are not suitable for popularization and utilization due to the expensive instruments, tedious operation process, high technical requirements for operators, and the fact that their use is time-consuming. Cadmium selenide (CdSe) QDs were synthesized by aqueous inorganic method using 3-mercaptopropionic acid (3-MPA) as a stabilizer, and measured their selectivity and sensitivity toward Cu2+ They were applied to detect the content of Cu2+
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