Method for determining content of oxynitride in air

A nitrogen oxide and air technology, applied in the field of determination of nitrogen oxide content in the air, can solve secondary pollution and other problems

Inactive Publication Date: 2015-03-25
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using low-toxic 2-N-ethyl-5-naphthol-7-sulfonic acid as a coupling reagent to replace the strong carcinogenic coupling reagent ...

Method used

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  • Method for determining content of oxynitride in air
  • Method for determining content of oxynitride in air
  • Method for determining content of oxynitride in air

Examples

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Embodiment

[0017] Step 1, collecting air, such as figure 1 In the air collection process shown, take two porous glass plate absorption tubes, add 6ml of absorption liquid into the porous glass plate absorption tubes, and connect the oxidation bottle with a silicon rubber tube between the two absorption tubes, and the oxidation bottle is filled with 5ml-10ml Acidic potassium permanganate solution. The gas outlet of the second porous glass plate absorption tube is connected to the drying bottle, and the gas outlet end of the drying bottle is connected to the atmospheric sampler, and a water-stop clamp is arranged between the two to prevent the solution from being sucked back. The air sampler continuously collects air for 60 minutes at a flow rate of 0.4 L / min. In the air collection process, an absorption tube that can achieve the same function as the porous glass plate absorption tube can also be used. The absorption tube is provided with an air inlet and an air outlet, and an absorption ...

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Abstract

The invention relates to a method for determining the content of oxynitride in air. The method comprises the following steps: continuously enabling air collected in atmosphere with a predetermined flow and at a preset time to pass through a first absorption tube, an oxidization bottle and a second adsorption tube which are connected in series to absorb oxynitride in reaction air; putting an absorption liquid which is reacted with air in absorption reaction in the first and second adsorption tubes into a reaction bottle filled with a diazo reaction liquid for diazo reaction; putting a diazo reaction liquid which is reacted in diazo reaction in the reaction bottle filled with the diazo reaction liquid into a reaction bottle of a coupled reaction liquid for azo reaction; and by taking a blank liquid of a reagent as a reference liquid, determining the absorbancy of the diazo reaction liquid after azo reaction and calculating concentration of oxynitride in air based on a standard work curve, wherein the vertical coordinate and horizontal ordinate of the standard work curve are respectively absorbancy and nitrite concentration. The determining method is convenient and efficient to operate, relatively high in sensitivity, accurate in result and suitable for popularization.

Description

technical field [0001] The invention relates to a method for measuring nitrogen oxide content in air. Background technique [0002] Nitrogen oxides are both primary pollutants and secondary pollutants, which widely exist in the air and pose a potential threat to the ecological environment and human health. Nitrogen oxides are not only one of the main substances that form acid rain, but also the main substance that forms photochemical smog in the atmosphere and an important factor that depletes ozone. Nitrogen oxides can enter the digestive tract through skin contact and ingestion of contaminated food, causing harm to the human body, and can also be inhaled through the respiratory tract, causing more serious harm to the human body. Therefore, accurate, sensitive and convenient determination of the concentration of nitrogen oxides in the air is of great significance for air quality evaluation and protection of human health. At present, the most commonly used method for measu...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 黄颖莹张彩虹尹晓航沈昕马骏涛彭阳施文健彪艳霞闻海峰杨琴淋
Owner UNIV OF SHANGHAI FOR SCI & TECH
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