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Quick detecting tube for micro-ammonia gas

A technology of gas detection and trace ammonia, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators on materials, etc., which can solve environmental secondary pollution, increase analysis errors, poor selectivity, etc. problems, to achieve the effects of improved detection sensitivity, less environmental pollution, and shorter sampling time

Inactive Publication Date: 2010-03-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ion chromatography is selective and sensitive, but sampling is difficult, it cannot be detected on the spot, and the use of large instruments is expensive; Nessler's reagent spectrophotometry is simple, but the selectivity is poor, and the Nessler's reagent used in the determination process contains a large amount of mercury Salt is very toxic, which can easily endanger the health of analysts and cause secondary pollution to the environment; sodium hypochlorite-salicylic acid spectrophotometry is more sensitive and has good selectivity, but the operation is complicated and cumbersome and takes a long time. Not suitable for emergency monitoring of air pollution
The operation steps of these determination methods are relatively complicated, and cannot be measured on-line in the field, which prolongs the analysis time and increases the analysis error
Some reagents are highly toxic and will affect the health of operators and the surrounding environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Measure 75mL of water glass with a modulus of 3.18, add 300mL of deionized water, and stir for 10min. Titrate with sulfuric acid to form a gel with pH = 8. The gel is first washed with a large amount of tap water and then washed with deionized water until pH = 7. There is no SO in the filtrate 4 2- exist. Filter with suction, and dry in a constant temperature oven at 120°C for 2 hours to obtain silica gel. Weigh 5g of silica gel, soak silica gel with sulfuric acid for 16h, wash with deionized water until there is no SO in the filtrate 4 2- . After air drying or drying at 100°C, cool to room temperature. Weigh 0.05g thymol blue and dissolve in 100mL deionized water. Add the acidified silica gel to 20mL of thymol blue solution, stir to make it fully mixed, place it in the dark at room temperature for 16h, and filter with suction. Put the carrier adsorbed with thymol blue indicator into 6 glass tubes with a diameter of 4 mm, label them, and pass them into the NH 3...

Embodiment 2

[0024] Compared with Example 1, the indicator concentration and carrier were changed. Weigh 30gBaCl 2 2H 2 Dissolve O in 100mL deionized water, add sulfuric acid until no precipitate is formed, stir for 30min, wash with deionized water until there is no SO in the filtrate 4 2- exist. Filtrate with suction and dry in a constant temperature oven at 120°C for 2 hours to obtain BaSO 4 . Weigh 0.1 g of thymol blue and dissolve in 100 mL of deionized water. 5gBaSO 4 Add it to 20mL thymol blue solution, stir to make it fully mixed, place it in the dark at room temperature for 16h, and filter it with suction. Put the carrier adsorbed with thymol blue indicator into 6 glass tubes with a diameter of 4 mm, label them, and pass them into the NH 3 Gas sample. The sample volume is 50mL, and the aeration time is 1min. The experimental results show that when the gas sample with a volume fraction of 0.002% and higher is injected, the detection tube has a significant color change, an...

Embodiment 3

[0026] A mixture of silica gel and barium sulfate was used as the carrier. Weigh 0.1 g of thymol blue and dissolve in 100 mL of deionized water. 5g silica gel and 5gBaSO 4 Add it to 40mL thymol blue solution, stir to make it fully mixed, place it in the dark at room temperature for 16h, and filter it with suction. Put the carrier adsorbed with thymol blue indicator into 6 glass tubes with a diameter of 4 mm, label them, and pass them into the NH 3 Gas sample. The sample volume is 50mL, and the aeration time is 1min. The experimental results show that when the gas sample with a volume fraction of 0.008% and higher is injected, the detection tube has a significant color change, and the detection limit is 0.008%, which is about 60mg / m 3 .

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Abstract

The invention relates to a detecting tube for low concentration ammonia gas. Barium sulfate, silica gel or a mixture of the barium sulfate and the silica gel is used as a carrier; thymolsulfonphthalein and methylthymol blue are used as color reagents. The ammonia gas samples with different concentrations flow into the detecting tube; the content of the ammonia gas is determined by different colorsof the color reagents; and the detecting tube has simple structure, quick analysis, low cost and convenient to carrying, and can detect whether the content of the ammonia gas in the environmental airon-site is over-proof at the field. The application experiment shows that the detecting tube has higher sensitivity and substantially meets the requirements of national standard.

Description

technical field [0001] The invention relates to the development of a trace ammonia gas detection tube, including the selection of carriers and indicators, and the control of the injection volume. Background technique [0002] Ammonia is a poisonous and flammable gas, which is an air pollutant, and the probability of leakage in pollution accidents is also high. Ammonia mainly comes from chemical plant leaks, refrigerator leaks, fuel combustion, and decomposition of nitrogen-containing organic matter in animals and plants. At the same time, ammonia gas, as an important chemical product and raw material, is widely used in chemical fertilizer, pharmaceutical, medical, construction, decoration materials processing and other industries. Such as compressed gas for industrial refrigerators, main raw material for synthetic nitrogen fertilizers, etc. [0003] There are many detection methods for ammonia, mainly including ion chromatography, Nessler's reagent spectrophotometry, sodiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 金鑫贾红霞陈咏梅万平玉王梅英
Owner BEIJING UNIV OF CHEM TECH
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