Test strip for detecting heavy metal-chromium (Cr) in water quality and preparation method thereof

A technology of test strips and heavy metals, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of being unsuitable for on-site detection of chromium and complicated processing procedures, and achieve Effects of shortened sample processing time, high recovery rate, and reduced production cost

Inactive Publication Date: 2011-07-13
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is to use graphite furnace atomic absorption spectrophotometry to detect heavy metal chromium. The sample pretreatm...

Method used

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  • Test strip for detecting heavy metal-chromium (Cr) in water quality and preparation method thereof
  • Test strip for detecting heavy metal-chromium (Cr) in water quality and preparation method thereof
  • Test strip for detecting heavy metal-chromium (Cr) in water quality and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 1 It is a schematic diagram of the use and detection principle of the rapid detection chromium test strip of the present invention. The light is reflected from the light-emitting diode to the test area of ​​the test strip, and the reflected light is received by the silicon diode and converted into an electrical signal for transmission, and finally displayed on the display. And the intensity of the electric signal is directly proportional to the color depth of the test area of ​​the test strip. The test strip in the present embodiment comprises insulating waterproof substrate 1, reaction substrate film 2, filter layer 3, spacer 4 and cover sheet 5, as figure 2 shown. After the insulating and waterproof substrate 1 and the cover sheet 5 are superimposed, the hole is punched by mechanical punching method. The hole diameter is 0.3mm, and the hole wall is 2mm away from the edge of the substrate. The adsorption effect makes the sample evenly distributed in the sampl...

Embodiment 2

[0035] (1) Obtaining of samples to be tested: same as in Example 1.

[0036] (2) Production of the reaction substrate film: including the reaction substrate film layer and the substrate film carrier. The substrate film carrier requires excellent light transmission and reflection functions. It is recommended to use polyvinyl chloride sheet, the optimum thickness is 80nm. The film layer of the reaction substrate is the coating of the developer. The basic production method is to weigh 0.148g of cetyltrimethylamine bromide, 2mL of 2% polyvinyl alcohol, and 2.08g of citric acid dissolved in 10mL of distilled water, that is, solution A and then accurately weigh the color developer diphenylcarbonyl Dihydrazine 0.968g, dissolved in 20mL acetone, solution B. Finally, mix the two solutions of A and B and pour them into a mortar, then add 3 g of water-soluble chitosan and 5 g of silica gel to fully grind to obtain a viscous film-forming agent. Finally, the prepared film-forming agent ...

Embodiment 3

[0042] (1) Obtaining of samples to be tested: same as in Example 1.

[0043] (2) Production of the reaction substrate film: including the reaction substrate film layer and the substrate film carrier. The substrate film carrier requires excellent light transmission and reflection functions. It is recommended to use polyvinyl chloride sheet, the optimum thickness is 80nm. The film layer of the reaction substrate is the coating of the developer. The basic production method is to weigh 0.296g of cetyltrimethylamine bromide, 3mL of 2% polyvinyl alcohol, and 2.08g of citric acid dissolved in 10mL of distilled water, that is, solution A and then accurately weigh the color developer diphenylcarbonyl Dihydrazine 1.936g, dissolved in 20mL acetone, that is solution B. Finally, mix the two solutions of A and B and pour them into a mortar, then add 4g of water-soluble chitosan and 6g of silica gel to fully grind to obtain a viscous film-forming agent. Finally, the prepared film-forming ag...

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Abstract

The invention provides a test strip for detecting heavy metal-chromium (Cr) in water quality and a preparation method thereof, and belongs to the technical field of water quality detection. The test strip sequentially comprises an insulating waterproof substrate, a reaction substrate membrane, a filter layer and a cover plate which are bonded together from the bottom up, wherein, two distance sleeves are respectively arranged at the sides of the test strip. The operating method comprises the following steps: immobilizing a color-developing agent (diphenylcarbazide) into the test strip; placing the obtained test strip in a photoelectric sensor, and then dropping a Cr-containing sample solution into the test strip for full color development reaction; and utilizing the sensor to irradiate the test strip by virtue of monochromatic light, then collecting green reflected light and finally converting the green reflected light into an electrical signal. The reflectivity of the developed test strip and corresponding Cr concentration show good linear relation after color development, the detection limit is less than 5mol/L, and the test time is less than 3 minutes. Repetitive experimental data proves that the method has the advantages of good repeatability and short detection time; and by utilizing the method, on-site rapid reagent-instrument integrated detection of Cr ions can be realized.

Description

technical field [0001] The invention relates to a test paper in the technical field of water quality monitoring and a preparation method thereof, in particular to a test paper strip for detecting heavy metal chromium in water quality and a preparation method thereof. Background technique [0002] Chromium and its compounds are widely used in metallurgy, tanning, electroplating and other industries. In the chrome plating process, only the chromium is plated on the plated parts, so the chromium is discharged with the production wastewater. Therefore, the pollution of chromium to the environment is becoming more and more serious, and long-term exposure to chromium will cause serious poisoning to the human body. The current confirmatory method for detecting chromium pollution is atomic absorption spectrophotometry. This method has the advantages of precision and accuracy, but the sample pretreatment is complicated, the detection time is long, large-scale instruments are require...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 刘国艳柴春彦商璟翁芝莹张洪才
Owner SHANGHAI JIAO TONG UNIV
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