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Method for detecting various heavy metal ions with photochemical colorimetric sensor array

A heavy metal ion and colorimetric sensor technology, applied in the field of sensors, can solve problems such as insufficient consideration of indicator fixation, failure to eliminate mutual interference, easy decolorization of test paper, etc.

Active Publication Date: 2012-05-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

At present, there are some commercial heavy metal ion detection test papers on the market, some of which are prepared by soaking the organic solution containing the indicator and drying it. The fixation of the indicator is not fully considered, which leads to the easy decolorization of the test paper; The indicator is prepared by mixing with the pulp, the production process is cumbersome, and the detection sensitivity is not ideal
In addition to simple visual colorimetry, there are currently imported spectral colorimeters on the market, but most of these colorimetric devices can only evaluate one indicator, and cannot eliminate the confusion when multiple samples respond to the same indicator at the same time. mutual interference

Method used

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  • Method for detecting various heavy metal ions with photochemical colorimetric sensor array
  • Method for detecting various heavy metal ions with photochemical colorimetric sensor array
  • Method for detecting various heavy metal ions with photochemical colorimetric sensor array

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Embodiment Construction

[0040] Establishment of standard "fingerprint" library:

[0041] 1) The heavy metal ion detection test paper for the fixed indicator, the heavy metal ion detection test paper uses the silica gel sol-gel method to fix the indicator, and the specific preparation is as follows:

[0042] Synthesis of Silica Sol Gels:

[0043] Tetraethoxysilane: Methyltriethoxysilane: Isopropanol: Catalyst: Water mixed in a molar ratio of 1:0-0.5:1-2:0.003-1:10-50, hydrolyzed at room temperature for 5-7 hours , to obtain a sol; add 10-80 mg of heavy metal ion indicator to 5 mL of the above-mentioned synthesized sol, stir and dissolve, and use uniform pulling (lifting speed = 2-15 mm / s) to form a film, and dissolve heavy metals The sol-gel of the ion indicator is evenly coated on the nitric acid-acetate mixed cellulose ester membrane (φ=3±0.2 μm), and dried at room temperature under the protection of nitrogen; the sensing membrane used for the detection of heavy metal ions is obtained;

[0044] ...

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Abstract

The invention relates to a photochemical colorimetric sensor array, and concretely relates to a method for detecting various heavy metal ions with the photochemical colorimetric sensor array. The method comprises the following steps: 1, fixing several heavy metal ion indicators on a porous sensitive film to form an array; 2, carrying out multichannel analysis by means of a plurality of single channel flow cell systems which are mutually independent with each other; and 3, rapidly determining whether contents of various trace heavy metal ions of Hg, Pb, Cd, Ag, As, Ni, Cu, Zn and the like in water exceed sewage discharge standards prescribed by national standards within 10min. According to the sensor array, a color imaging device acquires changes of colors before and after the exposure of the indicators in various different heavy metal ions and constructs RGB (red, green, blue) spectrum values corresponding with the color changes into the "fingerprint" of each heavy metal ions. In the sample test process, mathematical statistic methods of cluster analysis, main component analysis and the like are adopted to contrast the fingerprint of the sample with a "fingerprint" database, so unknown heavy metal ions can be qualitatively or semi-quantitatively analyzed.

Description

technical field [0001] The invention relates to a sensor, in particular to a method for detecting various trace heavy metal ions in water by a photochemical colorimetric sensor array. Background technique [0002] In recent years, timely early warning and effective governance of environmental pollution have become an extremely important link in the current national development process. After some toxic heavy metals are widely used in chemical and pharmaceutical production processes, most of them are finally converted into soluble cationic salts and exist in nature. Both the World Health Organization (WHO) and the US Environmental Protection Agency (EPA) have attached great importance to heavy metal ion pollutants in water. my country has also clearly stipulated the content of heavy metal ions in daily drinking water in the new "Drinking Water Hygienic Standards", and formulated the "Comprehensive Sewage Discharge Standard" to strictly limit the discharge of heavy metal ions...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 冯亮关亚风沈铮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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