Determination of trace copper by solid substrate-room temperature phosphorescence quenching method based on activating effect of alpha,alpha'-dipyridyl on Vitamin C reducing beryllon
| Autor: | Xuan Lin, Liu Jia Ming, Ping Ping Li, Shao Qin Lin, Jun Li Huang, Hong Lin, Hai Zhu Liu |
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| Rok vydání: | 2005 |
| Předmět: |
Reaction mechanism
Time Factors Inorganic chemistry Analytical chemistry chemistry.chemical_element Ascorbic Acid Naphthalenes Catalysis Chemistry Techniques Analytical Analytical Chemistry Instrumentation Spectroscopy Detection limit Ions Quenching (fluorescence) Filter paper Vitamin C Phosphorescence quenching Chemistry Temperature Copper Atomic and Molecular Physics and Optics Spectrometry Fluorescence Models Chemical Spectrophotometry Regression Analysis Phosphorescence Azo Compounds |
| Zdroj: | Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. 64(4) |
| ISSN: | 1386-1425 |
| Popis: | A new solid substrate-room temperature phosphorescence quenching method for the determination of trace copper has been established. It is based on the fact that beryllon (R) can emit strong and stable solid substrate-room temperature phosphorescence on the filter paper, and Vitamin C (Vc) reduces R to non-phosphorescent compound that leads to solid substrate-room temperature phosphorescence (SS-RTP) quenching of R, and alpha,alpha'-dipyridyl can activate copper catalyzing Vitamin C reducing R. The DeltaI(p) of the system with alpha,alpha'-dipyridyl is 3.3 times higher than that without alpha,alpha'-dipyridyl, which shows the reaction of alpha,alpha'-dipyridyl activating copper catalyzing Vitamin C reducing R. The reducing value of phosphorescence intensity (DeltaI(p)) is directly proportional to the content of Cu(II) in the range of 0.040-4.0 fg spot(-1) (corresponding concentration: 0.10-10.0 pg ml(-1), sample volume: 0.40 microlspot(-1)). The regression equation of working curve can be expressed as DeltaI(p)=69.99+41.00 m Cu(2+) (fg spot(-1)) (r=0.9980, n=6), and the detection limit is 0.0088 fg spot(-1)(corresponding concentration: 2.2 x 10(-14) g ml(-1)). This sensitive and accurate method with good repeatability and high selectivity has been applied to the determination of trace copper in real samples with satisfactory results. The reaction mechanism for the determination of trace copper by solid substrate-room temperature phosphorescence quenching method based on the activating effect of alpha,alpha'-dipyridyl on Vitamin C reducing beryllon is also discussed. |
| Databáze: | OpenAIRE |
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