Amosquito coilis amosquito-repellingincense,usually made into a spiral, and typically made using dried paste ofpyrethrumpowder. The coil is usually held at the center of the spiral, suspending it in the air, or wedged by two pieces of fireproof netting to allow continuous smoldering. Burning usually begins at the outer end of the spiral and progresses slowly toward the center of the spiral, producing a mosquito-repellent smoke.[1]A typical mosquito coil measures around 15 centimetres (6 in) in diameter and lasts around seven to twelve hours. Mosquito coils are widely used in Asia, Africa, South America, Canada, Mexico and Australia.[2]
Invention
editPyrethrum was used for centuries as aninsecticidein Persia and Europe,[3]being developed into a mosquito coil in the late 1800s by a Japanese couple: Yuki andEiichiro Ueyama.At that time in Japan, pyrethrum powder was mixed withsawdustand burned to repel mosquitoes. Ueyama initially created incense sticks mixed from starch powder, dried mandarin orange skin powder, and pyrethrum powder, burning in around 40 minutes. In 1895, Yuki proposed making the sticks thicker and longer, and curling them in spirals, in order to make them last longer. In 1902, after a series of trials and errors, Eiichiro achieved an incense burning effect with a spiral shape. The method included cutting thick incense bars to a set length and manually winding them into a spiral. This method was used until 1957, when mass production was made possible through machine punching.[4][5]After the Second World War, his company,Dainihon Jochugiku Co. Ltd,established joint-venture firms in various countries, including China and Thailand, to produce mosquito-repelling products based on local conditions.[5]
Ingredients
editActive ingredients found in mosquito coils may include:[6]
- Pyrethrum:a natural, powdered material from a kind ofchrysanthemumplant.
- Pyrethrins:an extract of the insecticidal chemicals in pyrethrum.
- Allethrin:sometimes d-trans-allethrin, the first synthetic pyrethroid.
- Esbiothrin:a form of allethrin.
- Dimefluthrin:a novel fluorinated pyrethroid pesticide.
- Meperfluthrin:a fluorinated pyrethroid ester[7]
- Metofluthrin:a fluorinated pyrethroid insecticide which is highly effective against mosquitoes. Also used in most mosquito repellants like candles, patches and mini fans.
- Butylated hydroxytoluene(BHT): an optional additive used to prevent pyrethroid from oxidizing during burning.
- Piperonyl butoxide(PBO): an optional additive to improve the effectiveness of pyrethroid.
- N-Octyl bicycloheptene dicarboximide(MGK 264): an optional additive to improve the effectiveness of a pyrethroid.
Disadvantages
editMosquito coils can be fire hazards. Their use has resulted in numerous accidental fires. In 1999, a fire in a South Korean three-story dormitory caused the death of 23 people when a mosquito coil was left unattended.[8]
The strong smell from the smoke may also linger; permeating fabric and furniture.
The health risks of mosquito coils are still being researched with some studies highlighting connections with lung cancer and exposure to mosquito coil smoke.[9][10][11]Coils sold in China and Malaysia were found to produce as much smokePM2.5as 75–137 burning cigarettes and formaldehyde emission levels in line with 51 burning cigarettes.[2]Other studies in rats conclude that mosquito coils are not a significant health risk, although some organisms may experience temporary sensory irritation like that caused by smoke from the combustion of organic materials such as logs. In one study, rats were directly exposed to a coil's smoke for six hours a day, five days a week for thirteen weeks. They showed signs of sensory irritation from the high smoke concentration, but there were no adverse effects on other parts of the body. The study concluded that, with normal use, mosquito coils are unlikely to be a health risk.[12]
See also
editReferences
edit- ^McKean, Erin,ed. (2005). "Mosquito Coil".The New Oxford American Dictionary.Oxford University Press. p. 1105.
- ^abLiu, Weili; Zhang, Junfeng; Hashim, Jamal H.; Jalaludin, Juliana; Hashim, Zailina; Goldstein, Bernard D. (September 2003)."Mosquito Coil Emissions and Health Implications".Environmental Health Perspectives.111(12): 1454–1460.Bibcode:2003EnvHP.111.1454L.doi:10.1289/ehp.6286.PMC1241646.PMID12948883.
- ^"Aromatica: History of pyrethrum".Bioaromatica Ltd. Archived fromthe originalon 24 March 2010.Retrieved31 October2009.
- ^Debboun, Mustapha; Frances, Stephen P.; Strickman, Daniel (2007).Insect repellents: principles, methods, and uses.Boca Raton: CRC Press. pp.6.ISBN978-0-8493-7196-7.
- ^abInternational Business Organization of Osaka, Inc (2004)."Great People of Osaka: Eiichiro Ueyama - Developing and promoting insecticide together with pyrethrum".Osaka Business Update.4.Archived fromthe originalon 3 February 2010.Retrieved31 October2009.
{{cite journal}}:|last=has generic name (help) - ^Strickman, Daniel; Frances, Stephen P.; Debboun, Mustapha (2009).Prevention of Bug Bites, Stings, and Disease.New York: Oxford University Press. pp.117.ISBN978-0-19-536577-1.
- ^"IUPAC: global availability of information on agrochemicals: meperfluthrin".University of Hertfordshire.Retrieved28 April2017.
- ^Trumbull, Charles P., ed. (2000). "Disasters".Britannica Book of the Year.Vol. 2000. Encyclopædia Britannica, Inc. p. 161.
- ^Shu-Chen, Chen; Ruey-Hong, Wong; Li-Jie, Shiu; Ming-Chih, Chiou; Huei, Lee (2008)."Exposure to Mosquito Coil Smoke May be a Risk Factor for Lung Cancer in Taiwan".Journal of Epidemiology.18(1): 19–25.doi:10.2188/jea.18.19.PMC4771599.PMID18305363.
- ^Zhang, Jie; Qi, Hui-Wei; Sun, Yu-Ping; Xie, Hui-Kang; Zhou, Cai-Cun (2015-04-01)."Mosquito coil exposure associated with small cell lung cancer: A report of three cases".Oncology Letters.9(4): 1667–1671.doi:10.3892/ol.2015.2922.ISSN1792-1074.PMC4356427.PMID25789020.
- ^Tang, Li; Lim, Wei-Yen; Eng, Philip; Leong, Swan Swan; Lim, Tow Keang; Ng, Alan W.K.; Tee, Augustine; Seow, Adeline (2010-09-01)."Lung Cancer in Chinese Women: Evidence for an Interaction between Tobacco Smoking and Exposure to Inhalants in the Indoor Environment".Environmental Health Perspectives.118(9): 1257–1260.Bibcode:2010EnvHP.118.1257T.doi:10.1289/ehp.0901587.ISSN0091-6765.PMC2944086.PMID20472525.
- ^Pauluhn, J; Mohr, U (May 2006). "Mosquito coil smoke inhalation toxicity. Part II: subchronic nose-only inhalation study in rats".Journal of Applied Toxicology.26(3): 279–92.doi:10.1002/jat.1139.PMID16552726.S2CID27054370.
External links
edit