Visual colorimetric fluorine ion sensing test-paper and use thereof

A technology of fluoride ion and test paper, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators on materials. It can solve problems such as difficult detection and achieve simple discrimination and good selective recognition. , Ease of use

Inactive Publication Date: 2006-08-09
NANJING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

On the basis of a series of studies, the inventor invented a detection test paper made of a metal complex with an azophenol group, which can detect a detection test paper with a concentration of 10ppm (Chinese patent application number: 200510041353.7) , has made progress in being suitable for general citizens, especially in rural areas, but it is difficult to detect the 1ppm concentration requirement stipulated in the safe drinking water standard stipulated by the World Health Organization

Method used

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  • Visual colorimetric fluorine ion sensing test-paper and use thereof
  • Visual colorimetric fluorine ion sensing test-paper and use thereof
  • Visual colorimetric fluorine ion sensing test-paper and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 (synthesis of coordination compound, improved synthetic method of the present invention)

[0030] 0.238 g (1.2 mmol) of 2,4-dinitrophenylhydrazine, bis(bipyridyl)(4,5-diazafluorenone) ruthenium complex 0.88 g (1 mmol) was added to a 5 ml A mixed solution of phosphoric acid in 25 ml of acetonitrile and 25 ml of ethanol was refluxed for 8 hours in a nitrogen atmosphere, concentrated to 5 ml, and 100 ml of ethanol solution was added to precipitate a brown precipitate, which was filtered and washed three times with ethanol. The precipitate was dissolved in 5 ml of water, and KPF was added 6 A dark black precipitate precipitated out, was filtered off, washed with ethanol and dried in vacuo, with a yield of 60%. Elemental analysis (C 10 h 8 N 2 ) 2 Ru(C 17 h 10 N 6 o 5 )(PF 6 ) 2 Values ​​are C, 41.6; H, 2.6; N, 13.2%, theoretical values ​​are C, 41.7; H, 2.4; N, 13.1%. NMR analysis 1 H NMR (500MHz, CD 3 CN, T-toluene sulfonic acid), δ (ppm): 8.96 (...

Embodiment 2

[0031] Embodiment 2 (selective experiment)

[0032] The acetonitrile solution (5 × 10 -5 M), respectively adding 1 equivalent of F - , 10 equivalents of H 2 PO 4 - , 20 equivalents of Cl - , Br - , I - , HSO 4 - , NO 3 - Tetrabutylamine salt solution, a color change is obtained (attached figure 1 ) and measure the absorption spectrum (attached figure 2 ) and fluorescence spectra (with image 3 ): obvious color change to fluoride ion, 10 times the amount of H 2 PO 4 - There is a certain change, for 20 times the amount of Cl - , Br - , I - , HSO 4 - , NO 3 - No meaningful color change was seen.

Embodiment 3

[0033] Embodiment 3 (color reaction)

[0034] Prepare the acetonitrile solution of the coordination compound of Example 1 and p-toluenesulfonic acid (1: 1), prepare the tetrabutylamine fluorine solution, mix the two solutions, and make the concentration of the coordination compound solution be 1×10 -5 M, the change of fluorine concentration, the measured visible ultraviolet spectrum ( Figure 4 ) and fluorescence spectra ( Figure 5 ). Measure the change of absorbance value at 580nm ( Figure 6 ). The binding constant between the coordination compound of Example 1 and the fluoride ion was calculated by nonlinear least square method as log K=6.71±0.04.

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Abstract

Present Invention discloses high efficiency selected development compound fluorine ion detection method and test paper based on identifying naked eye visual investigation combination. Said compound use 2, 4-binitro phenylhydrazones-4, 5-dihetero fluorenone ligand coordination as characteristic coordination compound, said compound selectivity detection to fluorine ion in 10-5concentration range, capable of using absorption photometry and naked eye visual colorimetry to detect. Discoloration test paper made from compound can detect fluorine ion concentration low to 1 ppm. Said inventive test paper has simple making, convenient detect, visual, in favor of habitualness detect of fluorine content in drinking water.

Description

technical field [0001] The invention belongs to the technical field of ion detection composed of a compound for optically detecting anion in combination with recognition, and specifically relates to a fluoride ion test paper using a compound with a metal coordination functional group as the color for recognition and development. Background technique [0002] The presence of trace amounts of fluorine in the environment, especially in water, seriously damages human health. Fluoride in drinking water increases the dental caries rate of children in areas with low fluoride water, and increases the prevalence of dental fluorosis and skeletal fluorosis in areas with high fluoride water. Severe fluorosis can lead to the extremely painful bone fluorosis. [0003] The fluoride ion concentration can be easily tested with a fluoride ion selective electrode, but it is not suitable for daily use by ordinary citizens in underdeveloped areas where fluorosis often occurs. On the basis of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 段春迎白志平林志华赵永刚张丙广区升举
Owner NANJING UNIV
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