Detecting VOCs (volatile organic compounds) is complicated because they tend to evaporate very easily at room temperature. They form a large family of gases and gaseous substances, many of which are considered pollutants, toxic or carcinogenic. Their volatile nature allows them to spread rapidly in the atmosphere, hence the need to detect and measure them to better protect ourselves. A variety of VOC detection techniques are available, from simple passive rosette to PID lamp and chromatography.<\/p>\n
Their properties and health effects vary depending on their nature. They can range from simple olfactory disturbance to mutagenic disorders, various irritations and decreased respiratory capacity.\u00a0<\/span>VOCs<\/span><\/strong>\u00a0Determination of toxicity (rather than explosiveness) in (fixed or portable) is much wiser to analyze the gas concentrations present.<\/span><\/p>\n In fact, the detection of VOCs<\/span><\/strong>\u00a0There is a real illogicality about\u00a0. Indeed, even if they are capable of forming explosive compositions, current concentrations must reach tens of thousands of parts per million (ppm). The main risk of volatile organic compounds is their toxicity at low concentrations on the order of a few tens of ppm.<\/span><\/p>\n<\/div>\n Alkanes (or hydrocarbons) come mainly from petroleum products and contain only carbon and hydrogen atoms, such as:\u00a0<\/span>butane<\/span>\u00a0, ethane, heptane, hexane, octane,\u00a0<\/span>pentane<\/span>\u00a0or\u00a0<\/span>propane<\/span>\u00a0. In general, alkanes are not very reactive and play less of a role in ozone formation than other VOCs.\u00a0<\/span><\/p>\n<\/div>\n Alkenes and alkynes, acetylene, ethylene<\/span>\u00a0are unsaturated hydrocarbons characterized by at least one double bond (alkenes) or triple bond (alkynes) between two carbon atoms, such as isoprene or propylene. These are mainly used in the chemical industry and are produced during oil refining. Alkenes are more reactive than alkanes due to the presence of a double bond, alkynes are even more reactive (triple bond).<\/span><\/p>\n<\/div>\n Aldehydes and ketones are unsaturated organic compounds (also called carbonyl compounds) obtained as a result of incomplete combustion of fuels or wood, or chemical derivatives of an alcohol formed by the loss of two hydrogen atoms (ketones), e.g. acetone, acrolein,\u00a0<\/span>formaldehyde<\/span>\u00a0or MEK.<\/span><\/p>\n<\/div>\n Monocyclic aromatic hydrocarbons, benzene, cymene, naphthalene, styrene<\/span>\u00a0,\u00a0<\/span>toluene<\/span>\u00a0or hydrocarbons containing a benzene nucleus, such as xylene.<\/span><\/p>\n<\/div>\n Halogenated hydrocarbons include chlorinated, brominated, or fluorinated hydrocarbons. These VOCs are present in the air due to their use as solvents, refrigerants, insecticides, or aerosol propellants such as chlorobenzene, chloroform, vinyl chloride, freons R11, R12, R22, R114, or trichloroethylene. These compounds are quite stable and can persist in the atmosphere for long periods of time.<\/span><\/p>\n<\/div>\n Due to the impressive number of substances grouped under this name and their highly volatile nature, volatile organic compounds (non-exhaustive list) are present in a large number of industrial sectors such as:\u00a0<\/span><\/p>\n VOC’lerin (u\u00e7ucu organik bile\u015fikler) tespiti karma\u015f\u0131kt\u0131r \u00e7\u00fcnk\u00fc oda s\u0131cakl\u0131\u011f\u0131nda \u00e7ok kolay buharla\u015fma e\u011filimindedirler. Bir\u00e7o\u011fu kirletici, toksik veya kanserojen olarak kabul edilen b\u00fcy\u00fck bir gaz ve gaz halindeki madde ailesini olu\u015ftururlar. U\u00e7ucu yap\u0131lar\u0131 atmosferde h\u0131zla yay\u0131lmalar\u0131na izin verir, bu nedenle kendimizi daha iyi korumak i\u00e7in bunlar\u0131 tespit etme ve \u00f6l\u00e7me ihtiyac\u0131 vard\u0131r. Basit pasif rozetten PID […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33,34],"tags":[],"class_list":["post-726","post","type-post","status-publish","format-standard","hentry","category-uygulamalar","category-gaz-algilama-uygulamalari"],"_links":{"self":[{"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/posts\/726","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/comments?post=726"}],"version-history":[{"count":2,"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/posts\/726\/revisions"}],"predecessor-version":[{"id":736,"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/posts\/726\/revisions\/736"}],"wp:attachment":[{"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/media?parent=726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/categories?post=726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gazolcum.com\/en\/wp-json\/wp\/v2\/tags?post=726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}5 VOC groups<\/span><\/h2>\n
Alkanes<\/span><\/h3>\n
Alkenes and alkynes<\/span><\/h3>\n
Aldehydes and ketones<\/span><\/h3>\n
Monocyclic aromatic hydrocarbons<\/span><\/h3>\n
Halogenated hydrocarbons<\/span><\/h3>\n
Sectors of activity exposed to VOCs<\/span><\/h2>\n
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