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- Title
[OPy][BF 4 ] Selective Extraction for Trace Hg 2+ Detection by Electrochemistry: Enrichment, Release and Sensing.
- Authors
Xiong, Chenyu; Hui, Yun; Wang, Ri; Bian, Chao; Xu, Yuhao; Xie, Yong; Han, Mingjie; Xia, Shanhong
- Abstract
Trace mercury ion (Hg 2 + ) detection is important for environmental monitoring and water safety. In this work, we study the electrochemical strategy to detect trace Hg 2 + based on the preconcentration of temperature-controlled N-octylpyridinium tetrafluoroborate ([OPy][BF 4 ]) dispersive liquid–liquid microextraction. The [OPy][BF 4 ] selectively extracted Hg 2 + from aqueous solution by the adsorption of unsaturated N in [OPy][BF 4 ], which increased the concentration of Hg 2 + and decreased that of other interference ions. It was noted that the adsorption of [OPy][BF 4 ] to Hg 2 + was weakened by aqueous solution. Hence, after extraction, precipitated [OPy][BF 4 ] was diluted by a buffer solution comprising a mixture of water and acetonitrile to release Hg 2 + and the single was detected by electrochemistry. Water is proposed to release Hg 2 + adsorbed by [OPy][BF 4 ], and the acetonitrile serves as a co-solvent in buffer solution. Sensitivity and anti-inference ability of sensors were improved using the proposed method and Hg 2 + releasing procedure. The detection limit (S/N = 3) of the sensor is 0.0315 μ g/L with a linear range from 0.1 to 1 μ g/L. And the sensor exhibits good recovery with an range from 106 % to 118%, which has great potential for trace Hg 2 + determination.
- Subjects
ELECTROCHEMISTRY; CHEMICAL preconcentration; TETRAFLUOROBORATES; BUFFER solutions; AQUEOUS solutions; LIQUID-liquid extraction; ENVIRONMENTAL monitoring; AQUATIC sports safety measures
- Publication
Micromachines, 2021, Vol 12, Issue 12, p1461
- ISSN
2072-666X
- Publication type
Article
- DOI
10.3390/mi12121461