Detection sheet, method, kit, and sensor for detection of heavy metal ions

A technology for heavy metal ions and detection sensors, applied in the field of detection sheets, can solve the problems of weak binding, leakage (dropping off, affecting the detection of heavy metal ions, etc. of heavy metal ion detection agent)

Inactive Publication Date: 2013-03-20
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above detection method, when the detection agent is directly coated on the carrier such as test paper or film for detection, due to the weak binding of the heavy metal ion detection agent and the carrier, the leakage (falling off) of the heavy metal ion detection agent is prone to occur, thus It will affect the detection of heavy metal ions; in addition, during the detection process, the heavy metal detection agent on the test paper reacts with the heavy metal ions in the aqueous solution to form a colored complex and develops color, so as to determine the content of the aqueous system by comparing with the color comparison card. The type of heavy metal ions, and the concentration of heavy metal ions is qualitatively or quantitatively determined according to the depth of the color. Since the heavy metal detection agents such as dithizone fixed on the substrate are oil-soluble and insoluble in water, the test paper is immersed in the content of the tested substance. When in aqueous solution, due to the difference in solubility, the chelation of heavy metal ions and these reagents is inhibited, which directly leads to the lower detection limit of the reaction test paper usually higher than the national standard method

Method used

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  • Detection sheet, method, kit, and sensor for detection of heavy metal ions
  • Detection sheet, method, kit, and sensor for detection of heavy metal ions
  • Detection sheet, method, kit, and sensor for detection of heavy metal ions

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Experimental program
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Embodiment approach

[0055] According to one embodiment, the method for preparing a detection sheet comprises:

[0056] A heavy metal ion detection agent layer is applied on the substrate; a polymer protective layer is coated on the heavy metal ion detection agent layer. When adding the adsorptive material to the polymer coating, the adsorptive material can be introduced into the polymer coating before, simultaneously with or after the application of the polymer coating.

[0057] Method for detecting heavy metal ions in aqueous system

[0058] The method for detecting heavy metal ions in an aqueous system of the present invention includes contacting the detection sheet coated with a polymer coating and a heavy metal ion detection agent with the aqueous system to be tested; oscillating the aqueous system and fully contacting the detection sheet; observing Check for discolouration. Preferably, an organic solvent is contained in the aqueous system to be tested. According to the need, in the aque...

Embodiment 1

[0098] The ordinary dithizone test paper made of common filter paper base and the dithizone test piece (test paper) made of filter paper base covered with polymer coating were used to detect Pb(II) in water.

[0099] The filter paper was soaked in 8wt% polystyrene (PS) toluene solution for 30 seconds, and then dried with a hair dryer to prepare polystyrene-coated filter paper (filter paper with polymer coating). Soak ordinary filter paper or filter paper with polymer coating into 1mg / mL dithizone-C 2 Cl 4 The solution was dried for 10 seconds at room temperature to prepare ordinary dithizone test paper and polymer-coated dithizone test paper respectively.

[0100] Put ordinary dithizone test paper or polymer-coated dithizone test paper into 10 mL of Pb(II) aqueous solution (made from Pb(NO 3 ) 2 Prepared with deionized water) or 10mL Pb(II) aqueous solution / C 2 Cl 4 Mixture (water and C 2 Cl 4Pb(II) ions were detected in disposable vials with volume ratio=20 / 1). Shake ...

Embodiment 2

[0104] Detection of Cd(II) in water with polymer-coated dithizone test paper.

[0105] The filter paper was soaked in 8wt% polystyrene (PS) toluene solution for 30 seconds, and then dried with a hair dryer to prepare a polymer-coated filter paper. Immerse the polymer-coated filter paper in 1 mg / mL dithizone-CCl 4 solution for 10 seconds, and then dried at room temperature to make dithizone test paper with polymer coating.

[0106] Put the dithizone test paper with polymer coating into the solution containing 10mL Cd(II) aqueous solution (CdCl 2 and deionized water) / C 2 Cl 4 Mixture (water and C 2 Cl 4 Cd(II) ions were detected in a disposable vial with volume ratio=20 / 1). Shake the sample bottle for 2 minutes, take out the test paper, and observe the color change of the test paper.

[0107] Figure 7 For using Cd(II) aqueous solution / C 2 Cl 4 Color change of dithizone test paper with polymer coating after mixed solution treatment. By 8wt%PS and 1mg / mL dithizone-CCl ...

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Abstract

The invention provides a detection sheet for detection of heavy metal ions in water needing to be detected. The detection sheet comprises a base, a polymer coating and a heavy metal ion detection agent layer, wherein through the polymer coating, the surface of the detection sheet has hydrophobicity. The invention also provides a method for detection of heavy metal ions by the detection sheet, a kit containing the detection sheet for detection of heavy metal ions, and a sensor for detection of heavy metal ions. The detection sheet can be carried conveniently and realizes portability of detection equipment thereby realizing simple, efficient and fast detection of heavy metal ions.

Description

field of invention [0001] The invention relates to a detection piece for detecting heavy metal ions in aqueous liquid, a method for detecting heavy metal ions using the detection piece, a portable test kit for detecting heavy metal ions by the detection method and a method for determining heavy metal ions detection sensor. Background technique [0002] Heavy metal (ion) pollution refers to environmental pollution caused by heavy metals or their compounds, mainly due to human factors such as mining, exhaust gas discharge, sewage irrigation and the use of heavy metal products, which lead to an increase in the content of heavy metals in the environment, especially heavy metal pollution in water systems , resulting in deterioration of environmental quality. [0003] A commonly used method for detecting heavy metal ions in an aqueous system is to add a heavy metal ion detection agent to the sample to be detected. The metal ion detection agent forms a colored complex by combining...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N21/25
CPCG01N33/18G01N33/1813G01N33/20G01N21/75G01N2021/7759G01N30/96G01N31/22G01N27/26
Inventor张晓科李勇明梶浦尚志
OwnerSONY CORP