Benzopyrene Detection ➣ Benzopyrene Detection Kit
release time：2023-12-02 10:53:33 i want to comment
Today I will share with you the knowledge of Benzopyrene detection, which will also explain the Benzopyrene Detection Kit, if it happens to solve the problems you are facing now , don't forget to pay attention to this site, let's start now! List of contents of this article: 1. Just want to know how to separate benzopyrene. . . 2. What are the urban air quality inspection items? Thank you. 3. How to detect the content of benzopyrene in asphalt. I would like to know how to separate benzopyrene. . . 1. The sampling volume can reach 350m 3 . The polycyclic aromatic hydrocarbons adsorbed on the filter membrane and resin can be extracted with 1+9 ethyl ether/n-hexane reflux, or cyclohexane and toluene reflux. If necessary, use column chromatography filled with 10g silica gel for purification, and analyze by gas chromatography-mass spectrometry after concentration to volume. 2. At present, the most researched method for removing benzopyrene is to use adsorbents, and the most reported method is activated carbon. Activated carbon has a very large surface area, contains phenolic functional groups, and its surface is non-polar and hydrophobic, so it can adsorb a large amount of benzopyrene. 3. The determination methods of 4-benzopyrene include thin chromatography, thin scanning method, fluorescence spectrophotometry, gas chromatography and high pressure liquid chromatography. Thin chromatography can separate pure 3,4-benzopyrene. Because it does not require special equipment, it is a commonly used testing technique in my country, but it can reach a quantitative level. 4. Principle This method mainly uses the sample to be purified by extraction, saponification or liquid-liquid distribution and column chromatography to remove fatty substances, pigments and other substances other than polycyclic aromatic hydrocarbons, and then pass through the chromatographic column in the liquid chromatograph , to separate benzopyrene from polycyclic aromatic hydrocarbons. Determine the content of benzopyrene in the sample. What are the urban air quality testing items? Thank you. The routine monitoring items of my country's ambient air quality evaluation city points are SO, NOx, CO, PMPM5, and other monitoring items are TSP, Pb, benzopyrene, fluoride and other toxic and harmful pollutants. At present, most urban evaluation points realize continuous automatic monitoring, and only a few are manual monitoring. Air quality monitoring: formaldehyde, carbon monoxide, carbon dioxide, ammonia, benzene, TVOC and other toxic and harmful gas pollution. Introduction to air quality inspection: Air quality inspection refers to the inspection of air quality. The quality of air quality reflects the level of pollutant concentration in the air. Indoor air detection test items: formaldehyde, benzene, TVOC, toluene, xylene, nitrogen. According to the indoor air quality standards, more than 180 households with nearly 30,000 square meters of buildings including newly built and newly renovated kindergartens, office buildings, and family rooms were investigated and monitored. The test results show that the qualified rate of indoor air quality is only 37%. How to detect the content of benzopyrene in asphalt 1. Asphalt is a benzopyrene detection benzopyrene detection that is very commonly used in our life, such as asphalt for laying benzopyrene detection on the ground, asphalt paint, and asphalt finished products. Asphalt is composed of hydrocarbons of different molecular weights and their non-metallic derivatives. Asphalt is a very high-viscosity organic liquid, which is generally liquid and black in color. 2. Therefore, in this part, the method of extracting the white material from the paving vehicle to determine the gradation, and taking the black material to determine the content of emulsified asphalt should be selected. 3. Inspection batch: A. Construction petroleum asphalt: the same batch leaves the factory, the same specification, the same label, 20t is a batch, and less than 20t is accepted as a batch. B． Road petroleum asphalt: the same batch leaves the factory, the same specification, the same label, 100t is a batch, and less than 100t is accepted by a batch. 4. Asphalt fume is a yellow gas, most of which is 0.1-l? m of tar fine mist. It has been determined that the asphalt fume discharged from the electrode roasting furnace contains 1.3-2 mg/m3 of 3,4 benzopyrene. 5. The asphalt fume is a yellow gas, most of which are 0.1-lm tar fine mist particles . The asphalt flue gas discharged from the electrode baking furnace contains 3,4 benzopyrene at 3-2mg/m3. That’s all for the introduction of benzopyrene detection. Thank you for taking the time to read the content of this site. For more information about benzopyrene detection kits and benzopyrene detection, don’t forget to search on this site.