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Array sensor for detecting heavy metal ions and its preparation method and application

An array sensor and heavy metal ion technology, applied in the field of analytical chemistry, can solve the problems of poor selectivity and semi-quantitative detection, and achieve the effects of long storage time, simple production process and good detection sensitivity

Active Publication Date: 2017-01-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

At present, many colorimetric / fluorescent array sensors have been used for the simultaneous detection of various heavy metal ions. For example, the Chinese patent application whose publication number is CN102466639 A discloses a method for photochemical colorimetric sensor arrays to be used for the detection of various heavy metal ions. However, the selectivity of this method is poor, and for the detection of real water bodies, especially the semi-quantitative detection in the case of interference from other ions, it seems powerless

Method used

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  • Array sensor for detecting heavy metal ions and its preparation method and application
  • Array sensor for detecting heavy metal ions and its preparation method and application
  • Array sensor for detecting heavy metal ions and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The preparation of embodiment 1 array sensor

[0046] (1) Screening of indicators:

[0047] In order to realize that the heavy metal ion indicator only responds to one kind of heavy metal ion, the mutual cross interference of different heavy metal ions to the same indicator is avoided. In 3,3',5,5'-tetramethylbenzidine, and rhodamine B derivative indicators containing the following general formula,

[0048]

[0049] Three kinds of indicators that respond specifically to Hg(II) were screened, namely: rhodamine B base derivatives (wherein X=N, Y=O, LG=amine group, as shown in formula I-1), Rhodamine B base derivatives (wherein X=N, Y=S, LG=aminoethyl, as shown in formula I-2), rhodamine B base derivatives (wherein X=S, Y=S, such as shown in formula Ⅰ-3), and denoted by L1, L2, and L3 respectively.

[0050] Two indicators that respond specifically to Ag(I) and Cu(II) were screened, namely: 3,3',5,5'-tetramethylbenzidine and rhodamine B base derivatives (wherein X=N,...

Embodiment 2～19

[0069] Construction of Embodiment 2-19 "Fingerprint"

[0070] (1) Colorimetric reading: Assemble the structured array sensitive membrane (i.e. array sensor) on the bottom step of the flow cell, cover the upper cover of the flow cell so that the sensitive membrane is just stuck in the middle of the flow cell; The uniform rate of / min pumps heavy metal ionic liquids of different concentrations into the flow cell system, and the 18 sensing response units on the sensitive membrane react with heavy metal ions to produce different color changes (response time is 10 minutes), and pass through the scanner read.

[0071] The flow cell is made of polytetrafluoroethylene, with a transparent glass window embedded at the bottom, which is used for the scanner to collect the color change of the sensing membrane. The sensing membrane is clamped in the middle of the "sandwich" upper and lower cavity type flow cell. After the sample solution is pumped into the bottom cavity of the flow cell wi...

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Abstract

The invention discloses a preparation method of an array applied to qualitative and semi-quantitative detection of three heavy metal ions of Hg(II), Ag(II) and Cu(II). The preparation method comprises the following steps: (1) selecting a colorimetric indicator with high sensitivity and selectivity on Hg(II), Ag(II) and Cu(II); (2) selecting a proper indicator fixed preparation; and (3) fixing and printing preparations doped with different colorimetric indicators on filter paper to build a visual array. Due to the adoption of the method, the array is capable of carrying out qualitative and semi-quantitative detection on the three heavy metal ions of Hg(II), Ag(II) and Cu(II). The sensor array is simple in manufacturing process, long in preservation time and relatively high in detection sensitivity; the foundation and possibility are provided for further carrying out overall detection and analysis on environmental pollutants.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to an array sensor for detecting heavy metal ions, a preparation method and application thereof. Background technique [0002] Today in the 21st century, the earth environment on which human beings depend is getting worse and worse, with frequent disasters, such as droughts, floods, land desertification, earthquakes, rising global temperatures, tsunamis, etc., timely early warning and effective treatment of environmental pollution It has become an extremely important link in the current national development process, and the threat of heavy metal ion pollution to human health cannot be ignored. These heavy metal ion pollutants mainly include Pb 2+ ,Hg 2+ ,Cd 2+ ,Cr(VI),As 3+ , Ag + , Mn(V) and so on. Harmful heavy metal wastewater will be discharged in industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 林恒伟刘力张凌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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