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A method and device for measuring volatile compounds

A determination method and volatility technology, applied in the field of analytical chemistry, can solve problems such as difficult blank control, high analysis cost, and poor detection limit, and achieve the effects of saving equipment investment, improving detection efficiency, and high measurement accuracy

Inactive Publication Date: 2018-09-18
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the analysis cost of this method is high, the analysis time is long, and the detection limit is not good
In addition, Nessler's reagent colorimetric method for ammonia determination requires the use of highly toxic mercury iodide complex ions for color development, which is relatively polluting to the environment. In addition, the blank of the method is not easy to control, making the detection limit poor.
For the determination of nitrite and air nitrogen oxides in food and the environment, the colorimetric analysis used also requires sample pretreatment, which has the disadvantages of large interference, low analysis cost, and detection limit difference.

Method used

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  • A method and device for measuring volatile compounds

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Experimental program
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Effect test

Embodiment 1

[0037] The features and advantages of the invention are set forth in the following description of the preferred embodiment in detail. Although the present invention has only been disclosed in several forms, it is clear to those skilled in the art that modifications, additions, subtractions and deletions related to the shape, size, and arrangement of parts in the present invention all belong to the rights of the present invention The scope of the core invention as stated in the requirements. Therefore, when it is attempted to make other changes or implementation methods suggested by the content taught here and fall within the scope of the appended claims, they all belong to the scope of the rights of the present invention. The reagents used in the present invention are all commercially available.

[0038] Example 1

[0039] Determination of carbon monoxide: In a U-shaped stainless steel tube with a length of 25 cm, an inner diameter of 1.5 mm, and an outer diameter of 2 mm, t...

Embodiment 2

[0041] Determination of trace amounts of chlorine: In a U-shaped glass tube with a length of 25 cm, an inner diameter of 1.5 mm, and an outer diameter of 2 mm, the filling length is about 15 cm according to the requirements of the filled chromatographic column, and the clay particle conversion agent containing ammonium sulfate (containing ammonium sulfate 30%), one end of the U-shaped tube is connected to the outlet pipe of the six-way valve sampling device for gas chromatography, and the six-way valve sampling tube is connected to the argon cylinder gas with a needle valve for pressure regulation. The U-tube outlet tube is connected to a filter tube filled with quartz wool to remove fine particles of clay and ammonium sulfate, and then connected to an in-use adispersive atomic fluorescence spectrometer using the arsenic hollow cathode lamp used in the instrument as an excitation light source. After adjusting the argon gas to 200ml / min, inject the sample containing chlorine ga...

Embodiment 3

[0043] Determination of ammonia: In a U-shaped stainless steel tube with a length of 25 cm, an inner diameter of 1.5 mm, and an outer diameter of 2 mm, a carbon particle catalyst (60-80 mesh, available in the market) with a length of about 15 cm is filled according to the requirements of the packed column. ), the catalyst tubes are clamped in a pedestal in a furnace to ensure uniform heating (700°C constant temperature). One end of the U-shaped stainless steel tube is connected to the outlet pipe of the six-way valve sampling device used for gas chromatography, and the six-way valve injection tube is connected to argon and hydrogen cylinders with needle valves to regulate the pressure. Afterwards, it is purified by molecular sieves. The U-tube outlet pipe is connected to a filter tube equipped with quartz wool to remove fine particle carbon carried by the carrier gas, and then connected to a non-dispersive atomic fluorescence spectrometer in use, using a cadmium hollow tube fo...

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PUM

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Abstract

The invention relates to a volatile compound determination method and an apparatus thereof, and discloses an inorganic gas determination method and an apparatus thereof. The method comprises the following steps: carrying out an oxidation reduction reaction on an inorganic gas to be determined and a derivatization reagent, and determining the above generated compound by using a light scattering / fluorescence / absorption technology in order to determine the content of the inorganic gas. The detection apparatus comprises a reaction device for carrying out oxidation reduction on the inorganic gas to be determined and the derivatization reagent, a purifying and separating device of the reaction product to be determined, a sample cell, an excitation light source and a detection device. Compared with present detection methods and apparatuses, the method and the apparatus disclosed in the invention are suitable for detection terminals of gas chromatography, and have the advantages of low detection limit, fast determination speed and simple apparatus devices.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method and a detection device for the quantitative determination of non-metallic compounds. Background technique [0002] The determination of carbon monoxide, carbon dioxide, nitrogen, nitrogen oxides, hydrogen, oxygen, ammonia, chlorine dioxide and other inorganic gases widely exists in samples in the fields of food, environment, materials, and chemicals. The existence of these compounds is very harmful to human health. For example, ammonia nitrogen in surface water and groundwater can lead to water eutrophication, is the main oxygen-consuming pollutant in water, and is toxic to fish and some aquatic organisms. Animal organic matter and nitrogen-containing organic matter in human and animal feces are very unstable, easily decomposed into ammonia and cause harm to humans. Ammonia nitrogen in water can be converted into nitrite under certain condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 段旭川
Owner TIANJIN NORMAL UNIVERSITY