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A Simple and Effective Visual Fluorescent Sensing Paper-Based Chip for the Ultrasensitive Detection of Mercury Ions in Environmental Water

Authors :
Jinglong Han
Huajun Liu
Ji Qi
Jiawen Xiang
Longwen Fu
Xiyan Sun
Liyan Wang
Xiaoyan Wang
Bowei Li
Lingxin Chen
Source :
Sensors; Volume 23; Issue 6; Pages: 3094
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

Traces of mercury ions in environmental water can harm humans and animals. Paper-based visual detection methods have been widely developed for the rapid detection of mercury ions; however, existing methods are not sensitive enough to be used in real environments. Here, we developed a novel, simple and effective visual fluorescent sensing paper-based chip for the ultrasensitive detection of mercury ions in environmental water. CdTe-quantum-dots-modified silica nanospheres were firmly absorbed by and anchored to the fiber interspaces on the paper’s surface to effectively avoid the unevenness caused by liquid evaporation. The fluorescence of quantum dots emitted at 525 nm can be selectively and efficiently quenched with mercury ions, and the ultrasensitive visual fluorescence sensing results attained using this principle can be captured using a smartphone camera. This method has a detection limit of 2.83 µg/L and a fast response time (90 s). We successfully achieved the trace spiking detection of seawater (from three regions), lake water, river water and tap water with recoveries in the range of 96.8–105.4% using this method. This method is effective, low-cost, user-friendly and has good prospects for commercial application. Additionally, the work is expected to be utilized in the automated big data collection of large numbers of environmental samples.

Details

ISSN :
14248220
Volume :
23
Database :
OpenAIRE
Journal :
Sensors
Accession number :
edsair.doi.dedup.....619c3896673e07559b232994e49287eb
Full Text :
https://doi.org/10.3390/s23063094