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学科主题: 物理化学
题名: Colorimetric filtrations of metal chelate precipitations for the quantitative determination of nickel(II) and lead(II)
作者: Feng, Liang1;  Zhang, Yue1;  Wen, Liying1;  Chen, Liang1;  Shen, Zheng1;  Guan, Yafeng1
通讯作者: 冯亮 ;  关亚风
刊名: ANALYST
发表日期: 2011
DOI: 10.1039/c1an15290d
卷: 136, 期:20, 页:4197-4203
收录类别: SCI
文章类型: Article
部门归属: 1
项目归属: 105
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical
摘要: Colorimetric filtrations of metal chelate precipitations for the quantitative determination of nickel(II) and lead(II)
研究领域[WOS]: Chemistry
英文摘要: A colorimetric filtration method has been developed for the highly selective and sensitive determination of Ni(2+) and Pb(2+) ions. Determinations of Ni(2+) and Pb(2+) follow the filtration using nioxime (1,2-cyclohexanedione dioxime) and rhodizonic acid disodium salt, respectively, as colorimetric reagents. Different from regular instrumentation techniques, the metal chelate precipitations are continuously pumped into a home-made flow cell at a constant flow rate, and filtered by a cellulose acetate/nitrate membrane. The color changes of the membrane are imaged using a conventional flatbed scanner, and digitized. The special selection of individual channels in the red, green, and blue channels of the images filters the influences of coexisting ions and provides a highly selective detection of Ni(2+) and Pb(2+) cations. The linear relationship between the colorimetric response of the chosen channel and Ni(2+) or Pb(2+) concentrations indicates a quantitative detection. The detection limit for Pb(2+) is 3 mu M (almost half of the Chinese wastewater discharge standard concentration), and is well below the nM level (94 nM) for Ni(2+) (a quarter of the WHO drinking water safe-exposure standard for Ni(2+)). The determinations take five to ten minutes. No shelf life issue exists because the chelating indicators react with metal directly without any pre-immobilizations.
关键词[WOS]: ATOMIC-ABSORPTION-SPECTROMETRY ;  SOLID-PHASE EXTRACTION ;  OPTICAL-EMISSION-SPECTROMETRY ;  ADSORPTIVE STRIPPING VOLTAMMETRY ;  WATER SAMPLES ;  SENSOR ARRAY ;  TRACE AMOUNTS ;  ICP-OES ;  OPTOELECTRONIC NOSE ;  PRECONCENTRATION
语种: 英语
WOS记录号: WOS:000295334000017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115450
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.CAS, Dalian Inst Chem Phys, Key Lab Separat Sci Analyt Chem, Lab Instrumentat & Analyt Chem, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Feng, Liang,Zhang, Yue,Wen, Liying,et al. Colorimetric filtrations of metal chelate precipitations for the quantitative determination of nickel(II) and lead(II)[J]. ANALYST,2011,136(20):4197-4203.
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