Carbon dioxide, Sulfur dioxide, Hydrogen sulfide, Hydrochloric acid and Carbon monoxide
Once a volcano erupts, gases are emitted and released into the atmosphere. During large eruptions, gases have actually caused global climate change. In other systems, gases are emitted continuously into the atmosphere from soils, volcanic vents, fumaroles and hydrothermal deposits. The spectrometer is designed to measure the concentration of sulfur dioxide (SO2) in the volcanic plume that is emitted from the volcano. The device requires a standard, from which to analyze the ultraviolet light absorbed by the SO2 molecules in the plume. The principal components of volcanic gases are water vapor (H 2 O), carbon dioxide (CO 2), sulfur either as sulfur dioxide (SO 2) (high-temperature volcanic gases) or hydrogen sulfide (H 2 S) (low-temperature volcanic gases), nitrogen, argon, helium, neon, methane, carbon monoxide and hydrogen. The sources of volcanic gases on Earth include: 1  primordial and recycled constituents from the Earth's mantle, 2  assimilated constituents from the Earth's crust, 3  groundwater and the Earth's atmosphere. Volcanic gases were directly responsible for approximately 3% of all volcano-related deaths of humans between 1900 and 1986. Some volcanic gases kill by acidic corrosion; others kill by asphyxiation. The greenhouse gas, carbon dioxide, is emitted from volcanoes, accounting for nearly 1% of the annual global total. Some volcanic gases including sulfur dioxide, hydrogen chloride, hydrogen sulfide and hydrogen fluoride react with other atmospheric particles to form aerosols. The sources of volcanic gases on Earth include: 1  primordial and recycled constituents from the Earth's mantle, 2  assimilated constituents from the Earth's crust, 3  groundwater and the Earth's atmosphere. A fumarole (ultimately from the Latin fumus , smoke) is an opening in a planet's crust, often in the neighborhood of volcanoes, which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide.  Volcanic eruptions emit water vapor and toxic gases into the atmosphere. Learn about the gases emitted from an erupting volcano, such as carbon dioxide, sulfur dioxide, hydrogen sulfide, hydrochloric acid and carbon monoxide and their effects in this video lesson. If significant amounts of these compounds are emitted from a volcanic eruption, they can irritate eyes and respiratory systems. Carbon monoxide can also be released during a volcanic eruption. Carbon monoxide is a gas you may have heard of as a dangerous gas that can come from a faulty heater or appliance in your home. There are many gases emitted from volcanoes, such as water vapor  (yes, it's a gas!), carbon dioxide, and sulphur dioxide. They are  also known to release smaller amounts of … hydrogen sulfide,  hydrogen, carbon monoxide, hydrogen chloride, hydrogen fluoride,  and helium into our atmosphere.  As the magma rises to the surface and is erupted, the pressure decreases, and some of the gas is released. The main gases dissolved in magma are water vapor, carbon dioxide, and sulfur gases, with lesser amounts of hydrogen, hydrochloric acid, and hydrofluoric acid. In geothermal areas, such as Pohoiki, however, hydrogen sulfide is essentially the only sulfur gas emitted. Hydrogen sulfide, sometimes called sewer gas, is a toxic gas that irritates the eyes, nose, and throat and has a rotten egg odor. Noxious sulfur dioxide gas and other pollutants emitted from Kilauea Volcano on the Island of Hawai`i react with oxygen and atmospheric moisture to produce volcanic smog (vog) and acid rain. Air pollution caused by SO2 and other gases emitted from Kilauea became a frequent problem on the Island of Hawai`i in 1986. Until that time, the volcano's ongoing eruption, which began in 1983, consisted of short, spectacular episodes of lava fountaining about once every 3 weeks. The most abundant gas is water vapor (H2O), followed by carbon dioxide (CO2), and sulfur dioxide (SO2). Secondary gases are also commonly emitted from volcanoes and include hydrogen sulfide (H2S), hydrogen (H), carbon monoxide (CO), hydrogen chloride (HCl), hydrogen fluoride (HF), and helium (He). The greatest potential hazards to humans, animals and agriculture are SO2, CO2 and HF. The spectrometer is designed to measure the concentration of sulfur dioxide (SO2) in the volcanic plume that is emitted from the volcano. The device requires a standard, from which to analyze the ultraviolet light absorbed by the SO2 molecules in the plume. Sulfur Dioxide. Another common gas emitted during a volcanic eruption is sulfur dioxide, and emissions of this gas may have the most significant impact on the Earth's climate. When sulfur dioxide is ejected into the stratosphere it gets converted to sulfuric acid aerosols, which are tiny sulfuric acid droplets. If significant amounts of these compounds are emitted from a volcanic eruption, they can irritate eyes and respiratory systems. Carbon monoxide can also be released during a volcanic eruption. Carbon monoxide is a gas you may have heard of as a dangerous gas that can come from a faulty heater or appliance in your home.
http://volcano.oregonstate.edu/book/export/html/151 https://en.wikipedia.org/wiki/Volcanic_gas https://en.wikipedia.org/wiki/Volcanic_gas https://en.wikipedia.org/wiki/Fumarole http://study.com/academy/lesson/volcanic-eruption-gases-released-their-effects.html http://www.answers.com/Q/What_gases_do_volcanoes_emit_into_the_atmosphere http://hvo.wr.usgs.gov/volcanowatch/archive/1996/96_08_25.html http://pubs.usgs.gov/fs/fs169-97/ http://volcano.oregonstate.edu/book/export/html/151 http://study.com/academy/lesson/volcanic-eruption-gases-released-their-effects.html
name of toxic gases emitted by volcanoes