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A colorimetric approach for measuring mercuric ions with high selectivity using label-free gold nanoparticles and thiourea
Wang, Qianru1,2; Li, Yiran1; Li, Min1; Wen, Congying1; Liu, Rongsheng1; Subhan, Fazle3; Yan, Zifeng1; Zeng, Jingbin1
Source PublicationANALYTICAL METHODS
2015
DOI10.1039/c5ay01328c
Volume7Issue:16Pages:6837-6841
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Life Sciences & Biomedicine ; Technology
WOS SubjectChemistry, Analytical ; Food Science & Technology ; Spectroscopy
WOS Research AreaChemistry ; Food Science & Technology ; Spectroscopy
WOS KeywordHG2+ DETECTION ; AQUEOUS-MEDIA ; MERCURY(II) ; SENSOR ; ANTIAGGREGATION ; SPECTROMETRY ; AGGREGATION ; ACID
AbstractWe report a simple colorimetric assay for Hg2+ measurements using label-free gold nanoparticles (Au NPs, 13.0 +/- 1.6 nm) with the aid of thiourea (TU). The addition of TU into Au NPs resulted in aggregation of Au NPs with a red-to-blue color change. While in the presence of Hg2+, it inhibited the aggregation of Au NPs induced by TU, resulting in a reverse color change from blue to purple and finally to wine red. These color variations are dependent on the Hg2+ concentration and can be utilized for the colorimetric sensing of Hg2+. This assay requires only 3 min to reach a naked-eye detection limit of 100 nM, which satisfies the guideline concentration of Hg2+ (250 nM) in industrial water regulated by the EPA. And the concentration of Hg2+ is quantitatively determined using a UV-vis spectrophotometer with a limit of detection (LOD) of 40 nM. The response of the assay caused by Hg2+ (2 mu M) was 6.0 to 9.1 times higher than those induced by other metal ions (100 mu M), indicating its high specificity towards Hg2+. The assay has been applied for the analysis of Hg2+ in drinking and lake water samples with recoveries in the range of 98.3-120.0%.
Language英语
WOS IDWOS:000359360400049
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/146442
Collection中国科学院大连化学物理研究所
Affiliation1.China Univ Petr East China, State Key Lab Heavy Oil Proc, Coll Sci, Qingdao 266555, Peoples R China
2.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
3.Abdul Wali Khan Univ, Dept Chem, Mardan Kpk, Pakistan
Recommended Citation
GB/T 7714
Wang, Qianru,Li, Yiran,Li, Min,et al. A colorimetric approach for measuring mercuric ions with high selectivity using label-free gold nanoparticles and thiourea[J]. ANALYTICAL METHODS,2015,7(16):6837-6841.
APA Wang, Qianru.,Li, Yiran.,Li, Min.,Wen, Congying.,Liu, Rongsheng.,...&Zeng, Jingbin.(2015).A colorimetric approach for measuring mercuric ions with high selectivity using label-free gold nanoparticles and thiourea.ANALYTICAL METHODS,7(16),6837-6841.
MLA Wang, Qianru,et al."A colorimetric approach for measuring mercuric ions with high selectivity using label-free gold nanoparticles and thiourea".ANALYTICAL METHODS 7.16(2015):6837-6841.
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