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Indicating substance for on-line testing formaldehyde oxide gas concentration

A formaldehyde gas and concentration technology, 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 reduced accuracy of results, identification of benzene series effects, and inconsistent color changes. Obvious problems, such as low cost, clear color change boundary and simple preparation process

Inactive Publication Date: 2008-07-23
DAQING GASOLINEEUM INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as patent 02285930.6 (application date 2002.11.12) announced a "disposable colorimetric quick test kit for formaldehyde in the air", respectively using acetylacetone or phenol reagent or 4-amino-3-hydrazine-5-mercapto-1 , 2,4-triazolene (AHMT) reagent is used as chromogenic agent, and most of the formaldehyde rapid detection products on the market belong to this type at present, and it exists the problem that color change is not obvious, and is greatly influenced by temperature; patent 200410017701.2 ( Application date 2004.04.15) announced a "rapid test paper for the determination of formaldehyde in the air". This type of test paper needs to be determined by visual colorimetry, and the individual differences are large, resulting in a decrease in the accuracy of the results; patent 200420084922.7 (application date 2004.07.28 ) announced a "formaldehyde gas detection tube", which uses the reaction of formaldehyde and benzene series to form a brown substance to detect formaldehyde gas, and uses sulfuric acid as a catalyst, which has low sensitivity, and benzene series is easy to sulfonate with sulfuric acid Disadvantages such as affecting identification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The above-mentioned solution 1 and solution 2 were mixed at a ratio of 1:10 (volume ratio) to obtain 110 mL of the main agent. Add 3.4mL Na at 3% of the total volume of the mixed solution 2 CO 3 -NaHCO 3 Buffer solution (pH value is 8.94), then weigh the interface modifier MgCl of 3.5g by 3% of the total mass of the mixed solution 2 ·6H 2 O, the indicator solution must be mixed and put into a brown reagent bottle for later use. Take 0.15mL of the mixed indicator solution, pour 0.11g of silica gel carrier into it, let it soak evenly to saturation, make the indicator substance, air dry naturally, and keep it sealed.

[0046] Make the prepared indicator substance into a badge-type detector, put it in the environment to be detected for 8 hours, and determine the concentration of formaldehyde in the room according to the length of the color-changing column in the 8-hour detector against the concentration scale.

[0047] The best detection range of the detector is 0.1-100m...

Embodiment 2

[0049] Mix solution 1 and solution 2 at a ratio of 1:10 (volume ratio) to obtain 110 mL of the main agent. According to 4% of the total volume of the mixed solution, add 4.6mL Na 2 CO 3 -NaHCO 3 Buffer solution (pH value is 8.94), then weigh the interface modifier ZnCl of 2.3g by 2% of the total mass of the mixed solution 2 , the indicator solution must be mixed and put into the reagent bottle for later use. Take 0.15mL of the mixed indicator solution, pour 0.11g of silica gel carrier into it, let it soak evenly to saturation, make the indicator substance, air dry naturally, and keep it sealed.

[0050] The prepared indicator substance is made into a badge type detector, and the best detection range of the detector is 0.1-100mg / m 3 , The measurement error is within 10%.

Embodiment 3

[0052] Mix solution 1 and solution 2 at a ratio of 7:100 (volume ratio) to obtain 107 mL of the main agent. Add 3.3mL Na at 3% of the total volume of the mixed solution 2 CO 3 -NaHCO 3 Buffer solution (pH value is 8.94), then weigh the interface modifier MgCl of 3.4g by 3% of the total mass of the mixed solution 2 ·6H 2 O, the indicator solution must be mixed and put into a brown reagent bottle for later use. Take 0.15mL of the mixed indicator solution, pour 0.11g of silica gel carrier into it, let it soak evenly to saturation, make the indicator substance, air dry naturally, and keep it sealed.

[0053] The prepared indicator substance is made into a badge type detector, and the best detection range is 0.1-80mg / m 3 , The measurement error is within 10%.

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Abstract

The invention relates to an indicator for on-site detecting formaldehyde gas density, which is composed of a main agent, a promoter, an interface modifier and a carrier, wherein the main agent is the mixture of acid hydroxylamine and hydrogen ion density indicator. The invention can realize online detection by arranging the material into a detector which can quantitatively display different formaldehyde gas densities. The detector prepared with the material has simple and sensitive detection method with low cost.

Description

Technical field: [0001] The invention relates to an indicator substance capable of detecting the concentration of harmful gas, in particular a substance capable of indicating the concentration of formaldehyde in the air. Background technique: [0002] With the rise of home decoration, the extensive use of decorative materials will inevitably cause indoor air pollution, and the pollution caused by formaldehyde has attracted much attention. When the formaldehyde content in the indoor air is 0.1mg / m 3 Odor and discomfort; 0.5mg / m 3 Sometimes it can irritate the eyes and cause tears; 0.6mg / m 3 Sometimes it can cause throat discomfort or pain; when the concentration is higher, it can cause nausea, vomiting, cough, chest tightness, asthma and even emphysema; 30mg / m 3 can result in immediate death. For this reason, many countries have all made instructive limit value regulation to the formaldehyde concentration in the air, and the " indoor air quality standard " that our countr...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 王宝辉吴红军王新苗陈微
Owner DAQING GASOLINEEUM INST
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