Optical probe film and special-purposed organic dye for micro determination of copper ion content in water sample

Abstract

The invention discloses an optical probe film and a special-purposed organic dye for micro determinations of copper ion contents in water sample. The structural formula of the organic dye provided by the present invention is represented by formula I. On the basis of the organic dye, an active group -COCl is introduced. The -COCl group is subject to an amidation reaction with -NH2 on chitosan, and is fixed on a chitosan film through a covalent bond. With the above processes, an optical probe film is produced. The optical probe film has specific response to copper ions. Because copper ions and organic dye molecules are combined through reversible complexations, when the content of the dissociated copper ions in the water sample is changed, the copper ion content still can be reflected instantly. When in use, the film is immersed in a water sample requiring testing, the film is stood in the water sample for 5 minutes, and analysis and determination can be carried out upon the copper-ion-containing water sample through a spectrophotometer. The optical probe film provided by the present invention has advantages of easy production and low cost. According to the present invention, the optical film does not pollute the water system requiring testing, and can be repeatedly used. With the optical film provided by the present invention, an in situ on-line detection can be realized. (Formula I)

Description

technical field [0001] The invention relates to an optical probe film and a special organic dye used for measuring the content of trace copper ions in water samples. Background technique [0002] Copper ion is a common heavy metal ion that widely exists in the environment. Its presence in the human body in an appropriate amount is beneficial to maintain the normal work of the body, such as participating in hematopoiesis, enzyme reactions, and some redox processes in the body. However, if the metabolic balance of copper ions in the body is disrupted, such as lack or excess of copper ions, it may lead to a series of diseases, such as Menkes syndrome and Wilson syndrome. Therefore, it is very important to detect the content of copper ions in various water qualities related to human life. my country's drinking water standard (GB 5749-85) stipulates that the copper ion content in drinking water shall not exceed 1.0ppm, and the sea water quality standard (GB 3097-1997) requires t...

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Problems solved by technology

But what the latter two have in common is that organic dyes are used directly in the solution, and most organic dyes can only be dissolved in organic solvents, which are easy to cause environmental pollution, and are difficult to recycle and cannot be reused; such as the national standard GB 7474-87 water quality copper There are following defects in the determination of sodium diethylaminodithioformate spectrophotometry: 1) need to use highly toxic organic solvents (such as carbon tetrachloride) to carry out extraction operations, 2) complex operations, easy to introduce errors, 3) iron , cobalt, nickel and other transition metal ions interfere greatly, often need to add masking reagents, 4) can not be repeated measurement, easy to pollute the system to be tested

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