Electric enhanced color development method and device thereof for rapid detection of lead ions or ferrous ions

A technology for ferrous ions and lead ions, which is applied in the field of electro-enhanced color development and devices for rapid detection of lead ions or ferrous ions, can solve the problems of low selectivity, limited applicability, and high detection limits, and achieves simplified processing and Effects of assay procedure, ease of assembly and adjustment, and ease of preparation

Inactive Publication Date: 2014-01-15
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned commodities and patents can realize rapid on-site determination of lead ions in aqueous solution samples, there are still the following relative deficiencies: (1) The detection limit is mostly 0.2-1.0mg / L, which is difficult to meet the 0.01mg / L specified in some national standards. L limit value requirements, its applicability is subject to certain restrictions
(2) Although some technical sensitivities can meet the limit requirement of 0.01mg / L, it often requires the use of costly nanomaterials or enzyme reagents with poor stability
(3) Some technologies still require relatively expensive analytical and testing instruments and cumbersome sample pretreatment processes
[0012] However, the above methods, patents or commercial test strips still have certain deficiencies, or involve expensive instruments and complicated sample pretreatment processes, or have low selectivity, or high detection limits, which have certain limitations for on-site rapid detection

Method used

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  • Electric enhanced color development method and device thereof for rapid detection of lead ions or ferrous ions
  • Electric enhanced color development method and device thereof for rapid detection of lead ions or ferrous ions
  • Electric enhanced color development method and device thereof for rapid detection of lead ions or ferrous ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Detection of ferrous ions:

[0047] (1) Production of chromogenic plate: Take a 2cm×4cm stainless steel plate, evenly coat the lower half with glue to make it sealed and insulated, take a 0.8cm×2cm polyester fiber film and paste it on the glue seal with double-sided tape;

[0048] (2) Preparation and coating of developer: Dissolve 0.001g o-phenanthroline in 0.5g ionic liquid (1-hexyl-3-methylimidazolium hexafluorophosphate), mix well, and take 2μL from it Spread it evenly on the upper part of the polyester fiber film of the chromogenic plate at about 0.8cm×1cm (see the schematic diagram of the chromogenic plate Figure 6 );

[0049] (3) Color rendering:

[0050] A. No electric field is applied. Take 5mL of a series of ferrous ion aqueous solutions with different concentrations (such as 10mg / L, 1mg / L, 0.1mg / L, etc.) The color development plate observes the color development under bright light.

[0051] B. Apply an electric field. according to Figure 5 Connect the...

Embodiment 2

[0054] Detection of ferrous ions:

[0055] Except for the aqueous solution sample to be tested, (1) the preparation of the chromogenic plate, (2) the preparation and coating of the chromogenic agent, and (3) the color development process are all the same as in Example 1.

[0056] (4) Solution pH experiment. Take several parts of 3mL ferrous ion aqueous solution with a concentration of 1mg / L, and add 2mL of buffer solutions with different pH values ​​respectively. optimal;

[0057] (5) Interference experiment. Take several portions of 3mL ferrous ion aqueous solution with a concentration of 1mg / L, add 2mL ammonia water-ammonium chloride buffer solution (pH 7~8) respectively, and then add masking agent 1mL 0.5g / L potassium sodium tartrate, 1mL 0.5g / L Thiourea, 1mL 0.5g / L trisodium citrate mixed to investigate the influence of interfering ions on color development. The results show that: adding 50 times of SO 4 2- , PO 4 3- , NO 3 - , 20 times K + , Na + , NH 4 + , ...

Embodiment 3

[0059] Detection of lead ions:

[0060] (1) The making of the chromogenic plate is the same as in Example 1;

[0061] (2) Preparation and coating of developer: Dissolve 0.0008g of dithizone in 0.5g of ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate), mix well, and take 8μL of it for coating Spread evenly on the upper part of the polyester fiber film of the chromogenic plate at about 0.8cm×1cm (see the structure schematic diagram of the chromogenic plate Figure 6 );

[0062] (3) Color rendering:

[0063]A. No electric field is applied. Take 5mL lead ion solutions of different concentrations (such as 1mg / L, 0.1mg / L, 0.01mg / L, etc.) One part is on the liquid surface, the other part is below the liquid surface, and the color will develop on the liquid surface within 5 minutes.

[0064] B. Apply an electric field. according to Figure 5 Connect the device, apply 30V voltage, and refer to A for other steps.

[0065] For photos of the experimental results, see ...

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Abstract

The invention relates to an electric enhanced color development method and a special device thereof for rapid detection of lead ions or ferrous ions, a metal sheet is used as a support carrier, a polyester fiber film is used as a color development agent adsorption carrier, the polyester fiber film is coated with a color development agent dissolved in an ionic liquid to prepare a color development plate, the color development plate is used as an electric enhanced color development working electrode, a platinum wire electrode is used as a counter electrode for combination with a direct-current power supply. According to the electric enhanced color development method and the special device thereof, the characteristics that the ionic liquid is insoluble in water and can dissolve the color development agent are used, a traditional spectrophotometry method for detection of the lead ions or the ferrous ions is transplanted to the color development plate, the method is simple, the operation is easy, the flexibility is high, and the electric enhanced color development means is introduced, so that the color development time is shortened, the detection sensitivity is improved, the detection limit reaches stipulated limits of various water quality standards, and the electric enhanced color development method and the special device thereof can be widely applied to qualitative and semi quantitative detection of the lead ions and ferrous ions in various water samples and have strong practical application values.

Description

technical field [0001] The invention relates to an electric enhanced color development method and device for detecting lead and ferrous ions, which are suitable for rapidly detecting lead and ferrous ions in aqueous solution on site. Background technique [0002] (1) Detection technology of lead ion [0003] Lead is one of the five major metal pollutants in water. It mainly comes from environmental pollution and is harmful to the human body. It can especially damage the nervous system of children, lead to mental decline in children, and can also cause blood circulation system and brain diseases. After lead accumulates in the human body, it is difficult to get rid of it automatically, and it can only be removed by certain drugs. The World Health Organization's control of lead in water is 0.01mg / L. my country has also established corresponding national standards for lead residue limits, for example: the highest lead content (beans) is 0.8mg / L, fresh milk is 0.05mg / L, and dri...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 危晶王邃吕莎莎
Owner NINGBO UNIV
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