CN113984746A - Method for preparing sulfur dioxide rapid gas detection tube by mixed carrier - Google Patents
Method for preparing sulfur dioxide rapid gas detection tube by mixed carrier Download PDFInfo
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- CN113984746A CN113984746A CN202111228573.6A CN202111228573A CN113984746A CN 113984746 A CN113984746 A CN 113984746A CN 202111228573 A CN202111228573 A CN 202111228573A CN 113984746 A CN113984746 A CN 113984746A
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- sulfur dioxide
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/783—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour for analysing gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention belongs to the field of rapid detection of toxic gases, and relates to a method for preparing a sulfur dioxide rapid gas detection tube by using a mixed carrier. The method comprises the steps of selecting a mixture of ceramic powder and quartz sand mixed according to different proportions as a carrier, pretreating the carrier, selecting a color developing agent, manufacturing indicator powder, filling the indicator powder into a specified glass tube, fixing absorbent cotton, and sealing two ends by melting. According to the invention, by mixing two carriers of quartz sand and ceramic powder with different particle sizes and selecting a new indicator combination, the detection time is shortened, the color change is obvious, the interface is clear, the repeatability is good, the sensitivity is high, the detection limit of the detection tube can be effectively improved, and the detection tube is stable and can be stored for a long time.
Description
Technical Field
The invention belongs to the field of rapid detection of toxic gases, and relates to a method for preparing a sulfur dioxide rapid gas detection tube by using a mixed carrier.
Background
The gas detecting tube is a thin glass tube filled with color-developing indicating powder, and is a simple device for measuring gas concentration. When the measured substance passes through the detection tube, the measured substance and the indicator rapidly react chemically to generate a colored substance, and the gas concentration is directly read according to the color change length. The method for measuring the concentration of the harmful gas by using the detection tube method has the advantages of rapid measurement, simple and convenient operation, small gas production amount and the like, and is widely applied at present.
Sulfur dioxide is the most common, irritating sulfur oxide, a colorless gas, and one of the major atmospheric pollutants. Sulfur dioxide in certain concentration can cause discomfort and irritation to the nasopharynx to cough, and can cause damage to the skin and mucous membranes after inhalation. Has irritant and corrosive effects on local tissues, and is more damaging to the bronchi than the upper respiratory tract due to its solubility, especially when combined with soot and aerosols, which can exacerbate significant damage to the respiratory mucosa. When sulfur dioxide dissolves in water, sulfurous acid is formed. If sulfurous acid is further oxidized in the presence of PM2.5, sulfuric acid (a main component of acid rain) is rapidly and efficiently produced. In order to ensure the safety of personnel and prevent the occurrence of sulfur dioxide poisoning, it is very important to know the prevention and treatment knowledge of sulfur dioxide gas and the sulfur dioxide detection method by knowing the source and the harm of the sulfur dioxide poisoning.
At present, the rapid detection methods for sulfur dioxide are also various, and mainly comprise a detection tube method, an indication paper method, an indication liquid method and the like.
Quick gaseous test tube is a detection instrument to gas concentration short-term test, even if the gas stability that awaits measuring is not high, also can effectively measure fast.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for preparing a sulfur dioxide rapid gas detection tube by using a mixed carrier. The method specifically comprises the processes of selection and pretreatment of a carrier, selection of an indicator, preparation of a detection tube and the like.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for preparing a sulfur dioxide rapid gas detection tube by using a mixed carrier comprises the steps of selecting a mixture of ceramic powder and quartz sand mixed according to different proportions as the carrier, pretreating the carrier, selecting a color developing agent, preparing indicator powder, filling the indicator powder into a specified glass tube, fixing absorbent cotton, and sealing two ends in a melting mode.
The preferable sulfur dioxide fast gas detection tube carrier adopts the mixture of ceramic powder and quartz sand.
The preferable sulfur dioxide rapid gas detection tube carrier adopts a mixture of ceramic powder and quartz sand with the mesh number of 60-120 meshes.
The preferable sulfur dioxide rapid gas detection tube carrier adopts ceramic powder and quartz sand with the mass ratio of 1: 10-10: 1.
The carrier of the preferable sulfur dioxide rapid gas detection tube is sequentially subjected to the pretreatment processes of screening, washing, acid washing, secondary washing, alcohol washing, drying and the like.
The preferred sulfur dioxide fast gas detector tube uses sodium hydroxide and methyl red as indicators.
The preferable sulfur dioxide rapid gas detection tube adopts sodium hydroxide with the concentration of 0.01-0.05 mol/L.
The preferable sulfur dioxide rapid gas detection tube adopts methyl red with the concentration of 0.02-0.1%.
The preferred sulfur dioxide fast gas detector tube adds sodium hydroxide and methyl red indicator to the carrier.
The preferred sulfur dioxide rapid gas detection tube uniformly and fully mixes the indicator powder, and the indicator powder is dried in the dark; the inside diameter of packing into the indicating powder that the quick gaseous test tube of sulfur dioxide will dry is 3mm, and in the glass pipe of long 140mm, every intraductal absorbent cotton for the quick gaseous test tube of 0.8 grams sulfur dioxide of packing into of glass fixes the indicating powder, and the alcohol blast burner is sealed to melt at both ends.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by mixing two carriers of quartz sand and ceramic powder with different particle sizes and selecting a new indicator combination, the detection time is shortened, the color change is obvious, the interface is clear, the repeatability is good, the sensitivity is high, the detection limit of the detection tube can be effectively improved, and the detection tube is stable and can be stored for a long time.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the present invention.
In the figures, the names corresponding to the reference numerals are a tube tip 1, absorbent cotton 2, indicator powder 3, a glass tube 4 and absorbent cotton 5.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
Example 1:
weighing 4.8 g of 60-80 mesh quartz sand and 24 g of 60-80 mesh ceramic powder, fully mixing the two to be used as a carrier, sequentially carrying out the pretreatment processes of screening, washing, pickling, secondary washing, alcohol washing, drying and the like, placing the mixture in a clean ceramic crucible, adding 0.2ml of 0.02mol/L sodium hydroxide solution, adding 3.2ml of 0.02% methyl red solution, stirring and mixing uniformly, placing the mixture in a dark place to dry until the particles are not adhered to each other, quickly placing the mixture in a glass tube with the inner diameter of 3mm and the length of 140mm after mixing uniformly, plugging two ends of the glass tube with absorbent cotton, and then sealing the mixture by using an alcohol blast lamp to prepare the gas detection tube. When the device is used, the two ends of the device are broken off and sealed, the device is connected with a gas sampling pump to enable the detected gas to flow through the detection tube at a constant speed, and the content of sulfur dioxide in the air can be measured according to the color change length and the gas flow of the detection tube.
The detecting tube is suitable for detecting the gas with the content of 1-20 mg/m3 in the air.
Example 2:
weighing 9.6g of 60-80 mesh quartz sand and 16g of 60-80 mesh ceramic powder, mixing the quartz sand and the ceramic powder uniformly, using the mixture as a carrier, sequentially carrying out pretreatment processes such as screening, washing, pickling, secondary washing, alcohol washing, drying and the like, placing the mixture in a clean ceramic crucible, adding 0.4ml of 0.05mol/L sodium hydroxide solution, adding 6.4ml of 0.05% methyl red solution, stirring and mixing uniformly, placing the mixture in a dark place to dry until the particles are not adhered to each other, quickly placing the mixture in a glass tube with the inner diameter of 3mm and the length of 140mm after mixing uniformly, plugging two ends of the glass tube with absorbent cotton, and then sealing the glass tube with an alcohol blast lamp to obtain the gas detection tube. When the device is used, the two ends of the device are broken off and sealed, the device is connected with a gas sampling pump to enable the detected gas to flow through the detection tube at a constant speed, and the content of sulfur dioxide in the air can be measured according to the color change length and the gas flow of the detection tube.
The detecting tube is suitable for detecting the gas with the content of 5-50 mg/m3 in the air.
Example 3:
weighing 14.4 g of 60-80 mesh quartz sand and 8 g of 60-80 mesh ceramic powder, mixing the two materials uniformly to obtain a carrier, sequentially performing the pretreatment processes of screening, washing, pickling, secondary washing, alcohol washing, drying and the like, placing the carrier in a clean ceramic crucible, adding 0.8ml of 0.01mol/L sodium hydroxide solution, adding 12.8ml of 0.1% methyl red solution, stirring and mixing uniformly, placing the mixture in a dark place to dry until the particles are not adhered to each other, mixing uniformly, quickly placing the mixture in a glass tube with the inner diameter of 3mm and the length of 140mm, plugging two ends of the glass tube with absorbent cotton, and then sealing the glass tube with an alcohol blast lamp to obtain the gas detection tube. When the device is used, the two ends of the device are broken off and sealed, the device is connected with a gas sampling pump to enable the detected gas to flow through the detection tube at a constant speed, and the content of sulfur dioxide in the air can be measured according to the color change length and the gas flow of the detection tube.
The detecting tube is suitable for detecting the gas with the content of 20-100 mg/m3 in the air.
Example 4:
weighing 7.7 g of 80-100 mesh quartz sand and 19.2 g of 80-100 mesh ceramic powder, mixing the two materials uniformly to obtain a carrier, sequentially performing the pretreatment processes of screening, washing, pickling, secondary washing, alcohol washing, drying and the like, placing the carrier in a clean ceramic crucible, adding 0.4ml of 0.02mol/L sodium hydroxide solution, adding 6.4ml of 0.05% methyl red solution, stirring and mixing uniformly, placing the mixture in a dark place to dry until the particles are not adhered to each other, quickly placing the mixture in a glass tube with the inner diameter of 3mm and the length of 140mm after mixing uniformly, plugging two ends of the glass tube with absorbent cotton, and then sealing the mixture by using an alcohol burner to obtain the gas detection tube. When the device is used, the two ends of the device are broken off and sealed, the device is connected with a gas sampling pump to enable the detected gas to flow through the detection tube at a constant speed, and the content of sulfur dioxide in the air can be measured according to the color change length and the gas flow of the detection tube.
The detecting tube is suitable for detecting the gas with the content of 5-50 mg/m3 in the air.
Example 5:
weighing 11.5 g of 100-mesh 120-mesh quartz sand and 12.8 g of 100-mesh 120-mesh ceramic powder, fully mixing the two materials uniformly to serve as a carrier, sequentially performing the pretreatment processes of screening, washing, pickling, secondary washing, alcohol washing, drying and the like, putting the mixture into a clean ceramic crucible, adding 1ml of 0.02mol/L sodium hydroxide solution, adding 15ml of 0.1% methyl red solution, stirring and mixing uniformly, placing the mixture in a dark place to dry until the particles are not adhered to each other, quickly putting the mixture into a glass tube with the inner diameter of 3mm and the length of 140mm after mixing uniformly, plugging two ends of the glass tube with absorbent cotton, and then sealing the mixture by using an alcohol burner to prepare the gas detection tube. When the device is used, the two ends of the device are broken off and sealed, the device is connected with a gas sampling pump to enable the detected gas to flow through the detection tube at a constant speed, and the content of sulfur dioxide in the air can be measured according to the color change length and the gas flow of the detection tube.
The detecting tube is suitable for detecting the gas with the content of 10-200 mg/m3 in the air.
As shown in figure 1, pipe tips 1 are arranged at two ends of a glass pipe 4, indicating powder 3 is arranged in the glass pipe 4, and absorbent cotton I2 and absorbent cotton II 5 are fixedly arranged at two ends of the indicating powder 3;
wherein 1, sodium hydroxide and methyl red are selected as indicators, the sensitivity is high, the color change is obvious, and the detection limit of the prepared detection tube is lower.
2. The mixture of ceramic powder and quartz sand with small specific surface area and weak adsorption capacity is used as a carrier, and the color change is obvious after ventilation, and the interface is clear.
3. The carrier is sequentially subjected to the pretreatment processes of screening, washing, acid washing, secondary washing, alcohol washing, drying and the like, the color-changing interface of the processed carrier is clear, and the method is more suitable for manufacturing a low-concentration detection tube.
4. By adjusting the particle sizes of the two carriers, the air permeability of the detection tube can be ensured to be good, the length of the readable interface of the detection tube is ensured to be consistent after the detection tube is discolored, and the human error is reduced.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A method for preparing a sulfur dioxide rapid gas detection tube by using a mixed carrier is characterized by comprising the steps of selecting a mixture of ceramic powder and quartz sand mixed according to different proportions as the carrier, pretreating the carrier, selecting a color developing agent, manufacturing an indication powder, filling the indication powder into a specified glass tube, fixing absorbent cotton and sealing two ends in a melting mode.
2. The method for preparing a sulfur dioxide fast gas detecting tube by using a mixed carrier as claimed in claim 1, wherein the sulfur dioxide fast gas detecting tube carrier uses a mixture of ceramic powder and quartz sand.
3. The method for preparing the sulfur dioxide fast gas detection tube by using the mixed carrier as claimed in claim 2, wherein the sulfur dioxide fast gas detection tube carrier is a mixture of ceramic powder and quartz sand with a mesh number of 60-120 meshes.
4. The method for preparing the sulfur dioxide rapid gas detection tube by using the mixed carrier according to claim 3, wherein the mass ratio of the ceramic powder to the quartz sand adopted by the sulfur dioxide rapid gas detection tube carrier is 1: 10-10: 1.
5. The method for preparing the sulfur dioxide fast gas detection tube by using the mixed carrier as claimed in claim 3, wherein the carrier of the sulfur dioxide fast gas detection tube is sequentially subjected to the pretreatment processes of screening, washing, acid washing, secondary washing, alcohol washing, drying and the like.
6. The method for preparing a sulfur dioxide fast gas detecting tube by using a mixed carrier as claimed in claim 5, wherein the sulfur dioxide fast gas detecting tube uses sodium hydroxide and methyl red as indicators.
7. The method for preparing the sulfur dioxide fast gas detection tube by using the mixed carrier as claimed in claim 6, wherein the concentration of sodium hydroxide adopted by the sulfur dioxide fast gas detection tube is 0.01-0.05 mol/L.
8. The method for preparing the sulfur dioxide fast gas detection tube by using the mixed carrier as claimed in claim 6, wherein the concentration of methyl red adopted by the sulfur dioxide fast gas detection tube is 0.02% -0.1%.
9. The method for preparing a sulfur dioxide fast gas detecting tube by using a mixed carrier as claimed in claim 7, wherein the sulfur dioxide fast gas detecting tube adds sodium hydroxide and methyl red indicator to the carrier.
10. The method for preparing the sulfur dioxide fast gas detection tube by using the mixed carrier as claimed in claim 9, wherein the indicating powder is uniformly stirred and fully mixed by the sulfur dioxide fast gas detection tube, and the indicating powder is dried in the dark; the inside diameter of packing into the indicating powder that the quick gaseous test tube of sulfur dioxide will dry is 3mm, and in the glass pipe of long 140mm, every intraductal absorbent cotton for the quick gaseous test tube of 0.8 grams sulfur dioxide of packing into of glass fixes the indicating powder, and the alcohol blast burner is sealed to melt at both ends.
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