What isVOCsGas?

VOCThe source:

VOCThe study of emission sources and their pollutant emissions is to control the atmosphericVOCfundamental, andVOCThe gas comes from a wide range of sources. TypicalVOCEmission sources can be divided into anthropogenic emission sources (including stationary and mobile sources) and natural emission sources (including biological and non-biological sources), of which anthropogenic emission sources are the main sources.VOC = Volatile Organic CompoundsThat is, volatile organic compounds. Currently, aboutVOCThere are many definitions, in the ordinary sense.VOCIt refers to volatile organic compounds; but the definition in the sense of environmental protection refers to a kind of active volatile organic compounds, that is, a kind of volatile organic compounds that will cause harm.

VOCClassification:

VOCAccording to its chemical structure, it can be further divided into: alkanes, aromatic hydrocarbons, esters, aldehydes and others. It has now been identified.300A variety. Common are benzene, toluene, xylene, styrene, trichloroethylene, trichloromethane, trichloroethane, diisocyanate (TDI), diisocyanurate, etc.

It is currently commonWHO(World Health Organization)The prescribed classification method, which is based on the boiling point pair.VOCwere classified.

VOCThe hazards:

（11) Harm to the environment

 ① Under the action of sunlight and heat, it participates in the reaction of nitrogen oxide to form ozone, which leads to the deterioration of air quality and is the main component of photochemical smog and urban haze in summer;

② VOCsis to form fine particles （PM2.5) and an important precursor of ozone, in the atmosphereVOCsInPM2.5The proportion20%～40%left and right, and somePM2.5ByVOCstransformed;

③ VOCsMost of them are greenhouse gases that cause global warming. 

（21) Harm to health

① Irritation&Toxicity 

VOCsMore than a certain concentration, will stimulate the eyes and respiratory tract, skin allergies, sore throat and fatigue; VOCsEasily through the blood-disorders of the brain, damage to the central nervous system;VOCsDamage to the liver, kidneys, brain and nervous system.       

② Carcinogenicity, teratogenic effects and reproductive toxicity

ForVOCGas detection can recommend apply to usShenzhen Technology Co., Ltd.CompanyLaunched in the UKAlphasensePIDlight ion principle sensorPID-A1：100ppb-6000ppm, high sensitivity, high stability, wide range, detectableVOCsThere are many kinds of volatile gases, such as oil refining industry monitoring, emergency treatment of hazardous chemical leakage and definition of leakage hazard area, safety monitoring of oil tank and oil station, monitoring of organic matter emission purification efficiency, etc.

PID-A1

But...PIDThe gases that cannot be detected are:Radioactivity, Air(N2, O2, CO2, H2O)Common Poisonous Gas(CO, HCN, SO2), natural gas(Methane, ethane, propane, etc)Acid gas(HCl, HF, HNO3), flurion gas, ozone, non-volatile gas, etc. There is a large difference in the sensitivity of the photoionization detector to compounds with different structures. The energy is10.6The sensitivity,9.8evofPIDA substance containing an electron-repulsive group in a benzene ring(Such as iodobenzene, p-toluidine, phenol, etc.)very selective.,Different UV lamps have different discharge gases. photons of different energies, using11.7evWhen the high-energy lamp,PIDIt can be used as a general-purpose detector; when a low-energy lamp is used, the range of components to be measured is narrowed, and the optical ionization detector is a selective detector.