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题名: A colorimetric approach for measuring mercuric ions with high selectivity using label-free gold nanoparticles and thiourea
作者: Wang, Qianru1, 2;  Li, Yiran1;  Li, Min1;  Wen, Congying1;  Liu, Rongsheng1;  Subhan, Fazle3;  Yan, Zifeng1;  Zeng, Jingbin1
刊名: ANALYTICAL METHODS
发表日期: 2015
DOI: 10.1039/c5ay01328c
卷: 7, 期:16, 页:6837-6841
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine ;  Technology
类目[WOS]: Chemistry, Analytical ;  Food Science & Technology ;  Spectroscopy
研究领域[WOS]: Chemistry ;  Food Science & Technology ;  Spectroscopy
英文摘要: We 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%.
关键词[WOS]: HG2+ DETECTION ;  AQUEOUS-MEDIA ;  MERCURY(II) ;  SENSOR ;  ANTIAGGREGATION ;  SPECTROMETRY ;  AGGREGATION ;  ACID
语种: 英语
WOS记录号: WOS:000359360400049
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146442
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.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:
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.
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