期刊
MICROCHIMICA ACTA
卷 187, 期 1, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-019-4057-6
关键词
Ionic mercury; Sub ng L-1 detection; Inductively coupled plasma mass spectrometry
资金
- NSF [CHE 1709160]
- UND Applied Research to Address the State's Critical Needs Initiative program
- NIH [5P20GM103442-18, 1P20GM113123, P20GM103442]
An ultrasensitive assay is described for the detection and determination of Hg2+(aq) in water samples based on single-particle inductively-coupled plasma/mass spectrometry (spICP-MS). In the presence of Hg2+(aq), AuNPs modified with a segment of single-stranded DNA aggregate due to the formation of the well-known thymine (T)-Hg2+-T complex. Single particle (sp) ICP-MS is used quantify the degree of aggregation by the overall decrease in number of detected AuNPs or NP aggregates. Compared with most other Hg2+ assays that use the same principle of aggregation-dispersion with DNA modified AuNPs, this method has a much lower detection limit of (0.031 ng L-1, 155 fM) and a wider (10,000-fold) linear range (up to 1 mu g L-1). The method also showed good practical potential because of its minimal interference from the water sample matrix.
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