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One-off simple rapid test kit for color matching formaldehyde and preparation method

A one-time, formaldehyde-based technology, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observation of the impact on chemical indicators. and other problems, to achieve the effect of easy operation and simple preparation process

Inactive Publication Date: 2005-08-31
上海塞艾生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of key reagents in liquid form and the use of absorption liquid have caused the following problems: 1) the key reagents in liquid form may not be stable enough, and the storage period is not long; 2) the key reagents need to be added to the reaction vessel, which is troublesome in use; 3) The container used to hold the absorbing liquid may be knocked over, resulting in sample loss, contamination, or damage to other objects and the human body
However, the basic AHMT formaldehyde detection layer prepared by this method is extremely unstable, and can only be stable for a few days at room temperature, and then loses the ability to react with formaldehyde gas to form a color change, so it cannot be used in commercial products
In addition, due to the low solubility of AHMT in ketone compounds, the formaldehyde gas detector prepared by this method has only a very small amount of AHMT, so the detection sensitivity is low
In addition, if filter paper is used as a solid support, the background is often high, and it is difficult to meet the requirements of detection accuracy.

Method used

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  • One-off simple rapid test kit for color matching formaldehyde and preparation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Weigh 0.15g AHMT and dissolve it in 250ul 1M HCl solution, after it is completely dissolved, add water to 1ml. Add the obtained solution into a gas absorber (such as a plastic bottle, etc.) to fully cover the inner bottom surface or wall surface of the appliance, heat and dry in vacuum until the liquid is completely volatilized, and package it into a detector after 1 hour. Place the detector in an environment with formaldehyde at 25°C. After 2 hours, add 1ml of pre-prepared activator (0.5M NaOH) to the detector. After 3 minutes, compare it with a colorimetric card. According to the detector The color depth (purple) of the medium solution is used to determine the content of formaldehyde gas in the environment by colorimetry.

example 2

[0027] Weigh 0.5g AHMT and dissolve it in 500ul 1M HCl solution, after it is completely dissolved, add water to 1ml. Add the obtained solution into a gas absorber (such as a glass test bottle, etc.) to fully cover the inner bottom or wall of the appliance, heat and dry in vacuum until the liquid is completely volatilized, and package it into a detector after 1 hour. Place the detector in an environment with formaldehyde at 25°C. After 1 hour, add 1ml of pre-prepared activator (0.5M NaOH) to the detector, and compare it with a color comparison card after 1 minute, according to the color of the solution Shade (purple) colorimetry to determine the content of formaldehyde gas in the environment.

example 3

[0029] Weigh 0.15g AHMT and dissolve it in 500ul 1M HCl solution, after it is completely dissolved, add water to 1ml. Put the obtained solution into a gas absorber (such as a plastic bottle, etc.), fully cover the inner bottom surface or wall surface of the appliance, heat and dry in vacuum until the liquid is completely evaporated, and package it into a detector after 1 hour. Place the detector in an environment with formaldehyde at 25°C. After 2 hours, add 1ml of pre-prepared activator (1M NaOH) to the absorber. After 1 minute, compare it with a color comparison card, according to the color depth of the solution. (Purple) Colorimetric determination of formaldehyde gas levels in the environment.

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Abstract

The present invention relates to a disposable formaldehyde colorimetric simple quick detector box and its preparation method. It is formed from detector previously-coated with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazacyclopentadiene (AHMT0 key reagent under the acidic condition, activating agent and colorimetric card. Said detector can be test box, test tube, test flask, microporous plate and microporous strip, and the described acidic condition is provided by utilizing hydrochloric acid, phosphoric acid, sulfuric acid or other acidic buffer solution and retained, and the activating agent is alkaline solution of excessive potassium hydroxide and sodium hydroxide, etc. Said invention also provides the preparation method of said detector and its application.

Description

Technical field [0001] The invention relates to the field of environmental protection detection, in particular to a disposable formaldehyde colorimetric simple rapid detection box and a preparation method thereof. Background technique [0002] Formaldehyde is a colorless and soluble irritating gas that can be absorbed through the respiratory tract and has a destructive effect on biological cell proteins. It is a highly toxic protoplasmic substance and is listed as one of the carcinogens by the International Cancer Institute. Formaldehyde has negative effects on human health. When the indoor content is 0.1 mg / m3, there is peculiar smell and sense of discomfort; 0.5 mg / m3 can stimulate eyes and cause tears; 0.6 mg / m3 can cause throat discomfort or pain; no matter how high the concentration is, it can cause nausea, vomiting, Cough, chest tightness, asthma and even emphysema; when the air reaches 230 mg / m3, it can cause death immediately. [0003] With the improvement of peopl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 翁龙平曹军
Owner 上海塞艾生物科技有限公司