Sensor based on asymmetric polymer film as well as detection method and applications thereof

A polymer film, asymmetric technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of matrix effect interference with heavy metal content, limit the detection limit of electrodes, etc., to shorten the detection time, reduce the detection limit, Reduce the effect of spreading

Active Publication Date: 2014-03-12
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In complex matrices such as seawater samples, the matrix effect is seriously interfered and the content of heavy metals is extremely low. The main ions in the membrane phase are easily combined with the high concentration of interfering ions (Na + ) occurs "ion exchange effect", and the generated main ion flux severely limits the detection limit of the electrode

Method used

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  • Sensor based on asymmetric polymer film as well as detection method and applications thereof
  • Sensor based on asymmetric polymer film as well as detection method and applications thereof
  • Sensor based on asymmetric polymer film as well as detection method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Based on the sensor of asymmetric polymer film, the PXSJ-216L ion meter 7 is respectively connected with the double-junction saturated calomel reference electrode 9 as the negative electrode and the working electrode 4 as the positive electrode through wires, and the working electrode 4 and the reference electrode 9 are inserted In the sample cell 3 to be detected, the working electrode 4 is composed of an ion-selective electrode and a rotating disk electrode 5 inserted therein. The ion-selective electrode is a polyvinyl chloride tube 6 with an asymmetric polymer film 8 adhered to the bottom, and is to be detected The sampling port of the sample pool 3 is connected with a peristaltic pump 2 and a device 1 composed of an ultraviolet digestion device and a microporous filter device in sequence. (see figure 1 ).

[0050] The ion-selective electrode is a polyvinyl chloride tube, and a layer of asymmetric polymer film is adhered to the bottom of the polyvinyl chloride tube....

Embodiment 2

[0061] Take the present invention to detect the content of copper ions in seawater collected from Yangma Island as an example. Its determination steps are as follows:

[0062] a. Seawater sample pretreatment: Take 10mL seawater sample and filter it through a 0.45μm microporous membrane, then pump it into the ultraviolet digestion device (ultraviolet lamp power 200W) at a flow rate of 1mL / min, and the outlet of the digestion device is connected to the sample collection pool.

[0063] b. Preparation of copper ion selective electrode:

[0064] 1) Preparation of asymmetric polymer film base: 125.3mg high molecular weight PVC particles, 50.4mg o-nitrophenyloctyl ether, 1.8mg cadmium ionophore and 1.8mg tetrakis(dodecyl)-tetrakis(4- Chlorophenyl)ammonium borate mixed, transferred to 2.5ml tetrahydrofuran solution, stirred for 2h to disperse evenly, and then naturally volatilized at room temperature for 12h to obtain a polymer film base with a thickness of about 100μm.

[0065] 2) ...

Embodiment 3

[0073] Determination of HgCl in solution by the present invention 4 2- content as an example. Its determination steps are as follows:

[0074] a.HgCl 4 2- Preparation of anion selective electrode:

[0075] 1) Preparation of asymmetric polymer film base: 125.3mg high molecular weight PVC particles, 50.4mg o-nitrophenyloctyl ether, 1.8mg lead ionophore carrier and 1.8mg tetrakis(dodecyl)-tetrakis(4 -Chlorophenyl) ammonium borate mixed, transferred to 2.5ml tetrahydrofuran solution, stirred for 2h to disperse evenly, and then naturally volatilized at room temperature for 12h to obtain a polymer film base with a thickness of about 100μm.

[0076] 2) Lipophilic ion-exchange layer: 0.734 mg of tris(dodecyl)ammonium chloride was dissolved in 1 mL of tetrahydrofuran.

[0077] 3) Use a hole punch to cut the polymer film base into uniform circular slices with a diameter of 0.6 cm, and adhere the polymer film base to the bottom of the polytetrafluoroethylene tube with a mixture of ...

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Abstract

The invention relates to detection on heavy metal ions, and particularly relates to a sensor based on an asymmetric polymer film as well as a detection method and applications thereof. An ionometer is respectively connected with a reference electrode and a working electrode by virtue of leads, a working electrode and the reference electrode are inserted in a to-be-detected sample pool, the working electrode is composed of an ion selective electrode and a rotating disk electrode inserted in the ion selective electrode, the ion selective electrode is a polyvinyl chloride tube, and an asymmetric polymer film is adhered to the bottom of the polyvinyl chloride tube; and the asymmetric polymer film is composed of a polymer film substrate and a lipophilic ion exchange bed. According to the invention, an asymmetric polymer film ion selective electrode is adopted, so that the sensitivity of heavy metal ion detection is remarkably improved, and the detection limit is reduced; and through combining with a rotating disk electrode technology, the detection time is shortened.

Description

technical field [0001] The invention relates to the detection of heavy metal ions, in particular to a sensor based on an asymmetric polymer film and its detection method and application. Background technique [0002] Polymer sensitive membrane ion-selective electrode is an important branch of chemical sensors. Its research began in the 1960s. Its detection principle is based on the relationship between the response potential of the sensitive membrane and the ion activity of the analyte according to Nemst. equation. This type of electrode has been widely used in the direct determination of various electrolyte ions in whole blood, serum, urine, tissue, intracellular fluid and its dilutions. The performance of ion-selective electrodes depends on ionophores with good selectivity immobilized in hydrophobic membranes. The two sides of the ion-selective membrane are respectively in contact with the sample solution and the internal reference solution. The selectivity of the sensor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333G01N27/49
Inventor 秦伟梁荣宁付秀丽宋文璟张倩玉
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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