Indicator fixation test paper for heavy metal ion detection, preparation thereof and application thereof

A technology for detecting heavy metal ions and test paper, applied in the field of porous materials, can solve the problems of insufficient consideration of indicator immobilization, unsatisfactory detection sensitivity, cumbersome production process, etc., to improve detection sensitivity, increase the probability of interaction, and improve the reaction dynamic effect

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

At present, there are also 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

Method used

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  • Indicator fixation test paper for heavy metal ion detection, preparation thereof and application thereof
  • Indicator fixation test paper for heavy metal ion detection, preparation thereof and application thereof
  • Indicator fixation test paper for heavy metal ion detection, preparation thereof and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) Synthesis of silica gel sol-gel: tetraethoxysilane: methyltriethoxysilane: isopropanol: catalyst (0.1 M hydrochloric acid): water mixed at a molar ratio of 1:0.1:2:0.003:25, at room temperature Under hydrolysis for 6 hours.

[0036] 2) Fixation of the heavy metal ion indicator: Add 4 mg xylenol orange heavy metal ion indicator to 1 mL of the above-synthesized sol, dissolve it by ultrasonic, take 100 μL of the solution, and evenly coat it on the nitric acid-acetate mixed cellulose ester film (φ=3 μm), and dry at room temperature under nitrogen protection.

[0037] 3) Preparation of standard color comparison card: Assemble the prepared heavy metal ion detection test paper into the matching detector, and inject 50 mL standard solutions of serial concentrations (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 mg / L), replace with a new test paper for each injection. Make a standard color comparison card according to the corresponding concentration of the heavy metal ion st...

Embodiment 2

[0041] 1) Synthesis of silica gel sol-gel: tetraethoxysilane: siloxane containing hydrophobic functional groups (methyltriethoxysilane: n-octyltriethoxysilane = 1:1): isopropanol: catalyst (0.1 M hydrochloric acid): water was mixed at a molar ratio of 1:0.2:10:0.01:5, and hydrolyzed at 60°C for 4 hours.

[0042] 2) Fixation of the heavy metal ion indicator: Add 4 mg of 1,2-cyclohexanedionedioxime heavy metal ion indicator to 1 mL of the sol synthesized above, ultrasonically dissolve, take 100 μL of the solution, and evenly coat it in nitric acid- cellulose acetate mixed membrane (φ = 3 μm), and dried at room temperature under nitrogen protection.

[0043] 3) Preparation of standard color comparison card: Assemble the prepared heavy metal ion detection test paper into the matching detector, and inject 50 mL standard solutions of serial concentrations (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 mg / L), replace with a new test paper for each injection. Make a standard color ...

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Abstract

The invention relates to a preparation and an application of an indicator fixation test paper for the heavy metal ion detection. The preparation comprises three steps of silica sol gel synthesis, indicator fixation and color comparison. Tetraethoxysilane and siloxane containing hydrophobic function groups, which are adopted as a mixed silicon source, are hydrolyzed under acidic conditions to synthesize the silica sol gel. The gel is mixed with a specific hydrophobic or water-soluble metal ion indicator, is uniformly coated on a nitric acid-acetic acid mixed cellulose film and is dried under the protection of nitrogen. The test paper of the invention can be used for determining trace heavy metal ions in water and can respectively, rapidly and semi-quantitatively determine various trace heavy metal ions in water within 10min.

Description

technical field [0001] The present invention relates to porous materials, in particular to a silica gel sol-gel fixed indicator used in the preparation of heavy metal ion detection test paper, and the filter head design for placing the test paper, so that the solution to be tested can evenly penetrate the test paper and accelerate the reaction Kinetic process, a method to improve detection sensitivity. 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 sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/77G01N21/78
Inventor 冯亮关亚风
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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