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| Names | |
|---|---|
| IUPAC name | |
| Other names Sulfurous anhydride Sulfur(IV) oxide | |
| Identifiers | |
| |
| 3535237 | |
| ChEBI |
|
| ChEMBL | |
| ChemSpider |
|
| ECHA InfoCard | 100.028.359 |
| EC Number | 231-195-2 |
| E number | E220 (preservatives) |
| 1443 | |
| KEGG |
|
| MeSH | Sulfur+dioxide |
| RTECS number | WS4550000 |
| UNII | |
| UN number | 1079, 2037 |
CompTox Dashboard(EPA) | |
| |
| |
| Properties | |
| SO 2 | |
| Molar mass | 64.066 g mol−1 |
| Appearance | Colorless gas |
| Odor | Pungent; similar to a just-struck match[1] |
| Density | 2.6288 kg m−3 |
| Melting point | −72 °C; −98 °F; 201 K |
| Boiling point | −10 °C (14 °F; 263 K) |
| 94 g/L[2] forms sulfurous acid | |
| Vapor pressure | 237.2 kPa |
| Acidity (pKa) | 1.81 |
| Basicity (pKb) | 12.19 |
| −18.2·10−6 cm3/mol | |
| Viscosity | 0.403 cP (at 0 °C) |
| Structure | |
| C2v | |
| Digonal | |
| Dihedral | |
| 1.62 D | |
| Thermochemistry | |
Std molar entropy(S | 248.223 J K−1 mol−1 |
| −296.81 kJ mol−1 | |
| Hazards | |
| GHS pictograms | |
| GHS signal word | Danger |
| H314, H331[3] | |
| NFPA 704 | |
| Lethal dose or concentration (LD, LC): | |
| 3000 ppm (mouse, 30 min) 2520 ppm (rat, 1 hr)[5] | |
LCLo (lowest published) | 993 ppm (rat, 20 min) 611 ppm (rat, 5 hr) 764 ppm (mouse, 20 min) 1000 ppm (human, 10 min) 3000 ppm (human, 5 min)[5] |
| US health exposure limits (NIOSH): | |
| TWA 5 ppm (13 mg/m3)[4] | |
REL (Recommended) | TWA 2 ppm (5 mg/m3) ST 5 ppm (13 mg/m3)[4] |
| 100 ppm[4] | |
| Related compounds | |
Related sulfuroxides | Sulfur monoxide Sulfur trioxide |
| Ozone Selenium dioxide Powered by Frostbite, Download FIFA 18 CPY blurs the line between the virtual and real worlds, bringing to life the players, teams and atmospheres of The World’s Game. Move with Real Player Motion Technology - an all-new animation system Fitgirl that creates a new level of. Download game fifa 18 repack pc. FIFA 18 Free Download PC Game Cracked in Direct Link and Torrent. FIFA 18 blurs the line between the virtual and real worlds, bringing to life the players,. | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| verify (what is ?) | |
| Infobox references | |
Sulfur dioxide (also sulphur dioxide in British English) is the chemical compound with the formula SO
2. It is a toxic gas with a burnt match smell. It is released naturally by volcanic activity and is produced as a by-product of the burning of fossil fuels contaminated with sulfur compounds and copper extraction.
- 3Production
- 4Reactions
- 5Uses
- 7Safety
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Structure and bonding[edit]
https://abhigh-power100.weebly.com/monogram-it-software-for-mac.html. SO2 is a bent molecule with C2vsymmetry point group.A valence bond theory approach considering just s and p orbitals would describe the bonding in terms of resonance between two resonance structures.
The sulfur–oxygen bond has a bond order of 1.5. There is support for this simple approach that does not invoke d orbital participation.[6]In terms of electron-counting formalism, the sulfur atom has an oxidation state of +4 and a formal charge of +1.
Occurrence[edit]
It is found on Earth and exists in very small concentrations and in the atmosphere at about 1 ppm.[7][8][clarification needed]
On other planets, it can be found in various concentrations, the most significant being the atmosphere of Venus, where it is the third-most significant atmospheric gas at 150 ppm. There, it condenses to form clouds, and is a key component of chemical reactions in the planet's atmosphere and contributes to global warming.[9] It has been implicated as a key agent in the warming of early Mars, with estimates of concentrations in the lower atmosphere as high as 100 ppm,[10] though it only exists in trace amounts. On both Venus and Mars, as on Earth, its primary source is thought to be volcanic. The atmosphere of Io, a natural satellite of Jupiter, is 90% sulfur dioxide[11] and trace amounts are thought to also exist in the atmosphere of Jupiter.
As an ice, it is thought to exist in abundance on the Galilean moons—as subliming ice or frost on the trailing hemisphere of Io[12], and in the crust and mantle of Europa, Ganymede, and Callisto, possibly also in liquid form and readily reacting with water.[13]
Production[edit]
Sulfur dioxide is primarily produced for sulfuric acid manufacture (see contact process). In the United States in 1979, 23.6 million tonnes (26,014,547 US short tons) of sulfur dioxide were used in this way, compared with 150 thousand tonnes (165,347 US short tons) used for other purposes. Most sulfur dioxide is produced by the combustion of elemental sulfur. Some sulfur dioxide is also produced by roasting pyrite and other sulfide ores in air.[14]
Combustion routes[edit]
Sulfur dioxide is the product of the burning of sulfur or of burning materials that contain sulfur:
- S + O2 → SO2, ΔH = −297 kJ/mol
To aid combustion, liquefied sulfur (140–150 °C, 284-302 °F) is sprayed through an atomizing nozzle to generate fine drops of sulfur with a large surface area. The reaction is exothermic, and the combustion produces temperatures of 1000–1600 °C, (1832-2912 °F). The significant amount of heat produced is recovered by steam generation that can subsequently be converted to electricity.[14]
The combustion of hydrogen sulfide and organosulfur compounds proceeds similarly. For example:
- 2 H2S + 3 O2 → 2 H2O + 2 SO2
The roasting of sulfide ores such as pyrite, sphalerite, and cinnabar (mercury sulfide) also releases SO2:[15]
- 4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2
- 2 ZnS + 3 O2 → 2 ZnO + 2 SO2
- HgS + O2 → Hg + SO2
- 4 FeS + 7O2 → 2 Fe2O3 + 4 SO2
A combination of these reactions is responsible for the largest source of sulfur dioxide, volcanic eruptions. These events can release millions of tonnes of SO2.
Reduction of higher oxides[edit]
Sulfur dioxide can also be a byproduct in the manufacture of calcium silicatecement; CaSO4 is heated with coke and sand in this process:
- 2 CaSO4 + 2 SiO2 + C → 2 CaSiO3 + 2 SO2 + CO2
Until the 1970s, commercial quantities of sulfuric acid and cement were produced by this process in Whitehaven, England. Upon being mixed with shale or marl, and roasted, the sulfate liberated sulfur dioxide gas, used in sulfuric acid production, the reaction also produced calcium silicate, a precursor in cement production.[16]
Yandere simulator download mac 2018. On a laboratory scale, the action of hot concentrated sulfuric acid on copper turnings produces sulfur dioxide.
- Cu + 2 H2SO4 → CuSO4 + SO2 + 2 H2O
From sulfite[edit]
Sulfite results from the reaction of aqueous base and sulfur dioxide. The reverse reaction involves acidification of sodium metabisulfite:
- H2SO4 + Na2S2O5 → 2 SO2 + Na2SO3 + H2O
Reactions[edit]
Industrial reactions[edit]
Treatment of basic solutions with sulfur dioxide affords sulfite salts (e.g. Adobe flash player for safari. sodium sulfite):
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- SO2 + 2 NaOH → Na2SO3 + H2O
Featuring sulfur in the +4 oxidation state, sulfur dioxide is a reducing agent. It is oxidized by halogens to give the sulfuryl halides, such as sulfuryl chloride:
- SO2 + Cl2 → SO2Cl2
Sulfur dioxide is the oxidising agent in the Claus process, which is conducted on a large scale in oil refineries. Here, sulfur dioxide is reduced by hydrogen sulfide to give elemental sulfur:
- SO2 + 2 H2S → 3 S + 2 H2O
The sequential oxidation of sulfur dioxide followed by its hydration is used in the production of sulfuric acid.
- 2 SO2 + 2 H2O + O2 → 2 H2SO4
Laboratory reactions[edit]
Sulfur dioxide is one of the few common acidic yet reducing gases. It turns moist litmus pink (being acidic), then white (due to its bleaching effect). It may be identified by bubbling it through a dichromate solution, turning the solution from orange to green (Cr3+ (aq)). It can also reduce ferric ions to ferrous. [17]
Sulfur dioxide can react with certain 1,3-dienes in a cheletropic reaction to form cyclic sulfones. This reaction is exploited on an industrial scale for the synthesis of sulfolane, which is an important solvent in the petrochemical industry.
Sulfur dioxide can bind to metal ions as a ligand to form metal sulfur dioxide complexes, typically where the transition metal is in oxidation state 0 or +1. Many different bonding modes (geometries) are recognized, but in most cases, the ligand is monodentate, attached to the metal through sulfur, which can be either planar and pyramidal η1.[18]
Uses[edit]
Precursor to sulfuric acid[edit]
Sulfur dioxide is an intermediate in the production of sulfuric acid, being converted to sulfur trioxide, and then to oleum, which is made into sulfuric acid. Sulfur dioxide for this purpose is made when sulfur combines with oxygen. The method of converting sulfur dioxide to sulfuric acid is called the contact process. Several billion kilograms are produced annually for this purpose.
As a preservative[edit]
Sulfur dioxide is sometimes used as a preservative for dried apricots, dried figs, and other dried fruits, owing to its antimicrobial properties, and is called E220[19] when used in this way in Europe. As a preservative, it maintains the colorful appearance of the fruit and prevents rotting. It is also added to sulfured molasses.
In winemaking[edit]
Sulfur dioxide was first used in winemaking by the Romans, when they discovered that burning sulfur candles inside empty wine vessels keeps them fresh and free from vinegar smell.[20]
It is still an important compound in winemaking, and is measured in parts per million (ppm) in wine. It is present even in so-called unsulfurated wine at concentrations of up to 10 mg/L.[21] It serves as an antibiotic and antioxidant, protecting wine from spoilage by bacteria and oxidation - a phenomenon that leads to the browning of the wine and a loss of cultivar specific flavors.[22][23] Its antimicrobial action also helps minimize volatile acidity. Wines containing sulfur dioxide are typically labeled with 'containing sulfites'.
Sulfur dioxide exists in wine in free and bound forms, and the combinations are referred to as total SO2. Binding, for instance to the carbonyl group of acetaldehyde, varies with the wine in question. The free form exists in equilibrium between molecular SO2 (as a dissolved gas) and bisulfite ion, which is in turn in equilibrium with sulfite ion. These equilibria depend on the pH of the wine. Lower pH shifts the equilibrium towards molecular (gaseous) SO2, which is the active form, while at higher pH more SO2 is found in the inactive sulfite and bisulfite forms. The molecular SO2 is active as an antimicrobial and antioxidant, and this is also the form which may be perceived as a pungent odor at high levels. Wines with total SO2 concentrations below 10 ppm do not require 'contains sulfites' on the label by US and EU laws. The upper limit of total SO2 allowed in wine in the US is 350 ppm; in the EU it is 160 ppm for red wines and 210 ppm for white and rosé wines. In low concentrations, SO2 is mostly undetectable in wine, but at free SO2 concentrations over 50 ppm, SO2 becomes evident in the smell and taste of wine.[citation needed]
SO2 is also a very important compound in winery sanitation. Wineries and equipment must be kept clean, and because bleach cannot be used in a winery due the risk of cork taint,[24] a mixture of SO2, water, and citric acid is commonly used to clean and sanitize equipment. Ozone (O3) is now used extensively for sanitizing in wineries due to its efficacy, and because it does not affect the wine or most equipment.[25]
As a reducing agent[edit]
Sulfur dioxide is also a good reductant. In the presence of water, sulfur dioxide is able to decolorize substances. Specifically, it is a useful reducing bleach for papers and delicate materials such as clothes. This bleaching effect normally does not last very long. Oxygen in the atmosphere reoxidizes the reduced dyes, restoring the color. In municipal wastewater treatment, sulfur dioxide is used to treat chlorinated wastewater prior to release. Sulfur dioxide reduces free and combined chlorine to chloride.[26]
Sulfur dioxide is fairly soluble in water, and by both IR and Raman spectroscopy; the hypothetical sulfurous acid, H2SO3, is not present to any extent. However, such solutions do show spectra of the hydrogen sulfite ion, HSO3−, by reaction with water, and it is in fact the actual reducing agent present:
- SO2 + H2O ⇌ HSO3− + H+
Biochemical and biomedical roles[edit]
Sulfur dioxide is toxic in large amounts. It or its conjugate base bisulfite is produced biologically as an intermediate in both sulfate-reducing organisms and in sulfur-oxidizing bacteria, as well. The role of sulfur dioxide in mammalian biology is not yet well understood.[27] Sulfur dioxide blocks nerve signals from the pulmonary stretch receptors and abolishes the Hering–Breuer inflation reflex.
It was shown that endogenous sulfur dioxide plays a role in diminishing an experimental lung damage caused by oleic acid. Endogenous sulfur dioxide lowered lipid peroxidation, free radical formation, oxidative stress and inflammation during an experimental lung damage. Conversely, a successful lung damage caused a significant lowering of endogenous sulfur dioxide production, and an increase in lipid peroxidation, free radical formation, oxidative stress and inflammation. Moreover, blockade of an enzyme that produces endogenous SO2 significantly increased the amount of lung tissue damage in the experiment. Conversely, adding acetylcysteine or glutathione to the rat diet increased the amount of endogenous SO2 produced and decreased the lung damage, the free radical formation, oxidative stress, inflammation and apoptosis.[28]
It is considered that endogenous sulfur dioxide plays a significant physiological role in regulating cardiac and blood vessel function, and aberrant or deficient sulfur dioxide metabolism can contribute to several different cardiovascular diseases, such as arterial hypertension, atherosclerosis, pulmonary arterial hypertension, stenocardia.[29]
It was shown that in children with pulmonary arterial hypertension due to congenital heart diseases the level of homocysteine is higher and the level of endogenous sulfur dioxide is lower than in normal control children. Moreover, these biochemical parameters strongly correlated to the severity of pulmonary arterial hypertension. Authors considered homocysteine to be one of useful biochemical markers of disease severity and sulfur dioxide metabolism to be one of potential therapeutic targets in those patients.[30] Safari 5.0 download for mac.
Endogenous sulfur dioxide also has been shown to lower the proliferation rate of endothelial smooth muscle cells in blood vessels, via lowering the MAPK activity and activating adenylyl cyclase and protein kinase A.[31] Smooth muscle cell proliferation is one of important mechanisms of hypertensive remodeling of blood vessels and their stenosis, so it is an important pathogenetic mechanism in arterial hypertension and atherosclerosis.
Endogenous sulfur dioxide in low concentrations causes endothelium-dependent vasodilation. In higher concentrations it causes endothelium-independent vasodilation and has a negative inotropic effect on cardiac output function, thus effectively lowering blood pressure and myocardial oxygen consumption. The vasodilating and bronchodilating effects of sulfur dioxide are mediated via ATP-dependent calcium channels and L-type ('dihydropyridine') calcium channels. Endogenous sulfur dioxide is also a potent antiinflammatory, antioxidant and cytoprotective agent. It lowers blood pressure and slows hypertensive remodeling of blood vessels, especially thickening of their intima. It also regulates lipid metabolism.[32]
Endogenous sulfur dioxide also diminishes myocardial damage, caused by isoproterenoladrenergic hyperstimulation, and strengthens the myocardial antioxidant defense reserve.[33]
As a refrigerant[edit]
Being easily condensed and possessing a high heat of evaporation, sulfur dioxide is a candidate material for refrigerants. Prior to the development of chlorofluorocarbons, sulfur dioxide was used as a refrigerant in home refrigerators.
As a reagent and solvent in the laboratory[edit]
Sulfur dioxide is a versatile inert solvent widely used for dissolving highly oxidizing salts. It is also used occasionally as a source of the sulfonyl group in organic synthesis. Treatment of aryl diazonium salts with sulfur dioxide and cuprous chloride yields the corresponding aryl sulfonyl chloride, for example:[34]
Proposed use in climate engineering[edit]
Injections of sulfur dioxide in the stratosphere has been proposed in climate engineering. The cooling effect would be similar to what has been observed after the large explosive volcano eruption of Mount Pinatubo in 1991. However this form of geoengineering would have uncertain regional consequences on rainfall patterns, for example in monsoon regions.[35]
As an air pollutant[edit]
Sulfur dioxide is a noticeable component in the atmosphere, especially following volcanic eruptions.[36] According to the United States Environmental Protection Agency,[37] the amount of sulfur dioxide released in the U.S. per year was:
| Year | SO2 |
|---|---|
| 1970 | 31,161,000 short tons (28.3 Mt) |
| 1980 | 25,905,000 short tons (23.5 Mt) |
| 1990 | 23,678,000 short tons (21.5 Mt) |
| 1996 | 18,859,000 short tons (17.1 Mt) |
| 1997 | 19,363,000 short tons (17.6 Mt) |
| 1998 | 19,491,000 short tons (17.7 Mt) |
| 1999 | 18,867,000 short tons (17.1 Mt) |
Sulfur dioxide is a major air pollutant and has significant impacts upon human health.[38] In addition, the concentration of sulfur dioxide in the atmosphere can influence the habitat suitability for plant communities, as well as animal life.[39] Sulfur dioxide emissions are a precursor to acid rain and atmospheric particulates. Due largely to the US EPA’s Acid Rain Program, the U.S. has had a 33% decrease in emissions between 1983 and 2002. This improvement resulted in part from flue-gas desulfurization, a technology that enables SO2 to be chemically bound in power plants burning sulfur-containing coal or oil. In particular, calcium oxide (lime) reacts with sulfur dioxide to form calcium sulfite:
- CaO + SO2 → CaSO3
Aerobic oxidation of the CaSO3 gives CaSO4, anhydrite. Most gypsum sold in Europe comes from flue-gas desulfurization.
Sulfur can be removed from coal during burning by using limestone as a bed material in fluidized bed combustion.[40]
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Sulfur can also be removed from fuels before burning, preventing formation of SO2 when the fuel is burnt. The Claus process is used in refineries to produce sulfur as a byproduct. https://fanever792.weebly.com/cuphead-for-mac-free-download.html. The Stretford process has also been used to remove sulfur from fuel. Redox processes using iron oxides can also be used, for example, Lo-Cat[41] or Sulferox.[42]
Fuel additives such as calcium additives and magnesium carboxylate may be used in marine engines to lower the emission of sulfur dioxide gases into the atmosphere.[43]
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As of 2006, China was the world's largest sulfur dioxide polluter, with 2005 emissions estimated to be 25,490,000 short tons (23.1 Mt). This amount represents a 27% increase since 2000, and is roughly comparable with U.S. emissions in 1980.[44]
Safety[edit]
Inhalation[edit]
Inhaling sulfur dioxide is associated with increased respiratory symptoms and disease, difficulty in breathing, and premature death.[45] In 2008, the American Conference of Governmental Industrial Hygienists reduced the short-term exposure limit to 0.25 parts per million (ppm). The OSHAPEL is currently set at 5 ppm (13 mg/m3) time-weighted average. NIOSH has set the IDLH at 100 ppm.[46] In 2010, the EPA 'revised the primary SO2NAAQS by establishing a new one-hour standard at a level of 75 parts per billion (ppb). EPA revoked the two existing primary standards because they would not provide additional public health protection given a one-hour standard at 75 ppb.'[38]
A 2011 systematic review concluded that exposure to sulfur dioxide is associated with preterm birth.[47]
Ingestion[edit]
In the United States, the Center for Science in the Public Interest lists the two food preservatives, sulfur dioxide and sodium bisulfite, as being safe for human consumption except for certain asthmatic individuals who may be sensitive to them, especially in large amounts.[48] Symptoms of sensitivity to sulfiting agents, including sulfur dioxide, manifest as potentially life-threatening trouble breathing within minutes of ingestion.[49]
See also[edit]
Fe Review Manual Lindeburg Pdf Free Download For Pc
References[edit]
- ^Sulfur dioxide, U.S. National Library of Medicine
- ^Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN0-8493-0487-3.
- ^https://echa.europa.eu/information-on-chemicals/cl-inventory-database/-/discli/notification-details/115657/1409763
- ^ abcNIOSH Pocket Guide to Chemical Hazards. '#0575'. National Institute for Occupational Safety and Health (NIOSH).
- ^ ab'Sulfur dioxide'. Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
- ^Cunningham, Terence P.; Cooper, David L.; Gerratt, Joseph; Karadakov, Peter B. & Raimondi, Mario (1997). 'Chemical bonding in oxofluorides of hypercoordinatesulfur'. Journal of the Chemical Society, Faraday Transactions. 93 (13): 2247–2254. doi:10.1039/A700708F.
- ^Owen, Lewis A.; Pickering, Kevin T (1997). An Introduction to Global Environmental Issues. Taylor & Francis. pp. 33–. ISBN978-0-203-97400-1.
- ^Taylor, J.A.; Simpson, R.W.; Jakeman, A.J. (1987). 'A hybrid model for predicting the distribution of sulphur dioxide concentrations observed near elevated point sources'. Ecological Modelling. 36 (3–4): 269–296. doi:10.1016/0304-3800(87)90071-8. ISSN0304-3800.
- ^Marcq, Emmanuel; Bertaux, Jean-Loup; Montmessin, Franck; Belyaev, Denis (2012). 'Variations of sulphur dioxide at the cloud top of Venus's dynamic atmosphere'. Nature Geoscience. 6: 25. doi:10.1038/ngeo1650. ISSN1752-0894.
- ^Halevy, I.; Zuber, M. T.; Schrag, D. P. (2007). 'A Sulfur Dioxide Climate Feedback on Early Mars'. Science. 318 (5858): 1903–1907. doi:10.1126/science.1147039. ISSN0036-8075. PMID18096802.
- ^Lellouch, E.; et al. (2007). 'Io's atmosphere'. In Lopes, R. M. C.; Spencer, J. R. (eds.). Io after Galileo. Springer-Praxis. pp. 231–264. ISBN3-540-34681-3.
- ^Cruikshank, D. P.; Howell, R. R.; Geballe, T. R.; Fanale, F. P. (1985). 'Sulfur Dioxide Ice on IO'. Ices in the Solar System: 805–815. doi:10.1007/978-94-009-5418-2_55. ISBN978-94-010-8891-6.
- ^Europa's Hidden Ice Chemistry – NASA Jet Propulsion Laboratory. Jpl.nasa.gov (2010-10-04). Retrieved on 2013-09-24.
- ^ abMüller, Hermann, 'Sulfur Dioxide', Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a25_569
- ^Shriver, Atkins. Inorganic Chemistry, Fifth Edition. W. H. Freeman and Company; New York, 2010; p. 414.
- ^WHITEHAVEN COAST ARCHAEOLOGICAL SURVEY. lakestay.co.uk (2007)
- ^Template:Http://publications.gc.ca/collections/collection 2017/rncan-nrcan/M34-20/M34-20-107-eng.pdf
- ^Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN978-0-08-037941-8.
- ^Current EU approved additives and their E Numbers, The Food Standards Agency website.
- ^'Practical Winery & vineyard Journal Jan/Feb 2009'. www.practicalwinery.com. 1 Feb 2009. Archived from the original on 2013-09-28.
- ^Sulphites in wine, MoreThanOrganic.com.
- ^Jackson, R.S. (2008) Wine science: principles and applications, Amsterdam; Boston: Elsevier/Academic Press
- ^Guerrero, Raúl F; Cantos-Villar, Emma (2015). 'Demonstrating the efficiency of sulphur dioxide replacements in wine: A parameter review'. Trends in Food Science & Technology. 42: 27. doi:10.1016/j.tifs.2014.11.004.
- ^Chlorine Use in the Winery. Purdue University
- ^Use of ozone for winery and environmental sanitation, Practical Winery & Vineyard Journal.
- ^Tchobanoglous, George (1979). Wastewater Engineering (3rd ed.). New York: McGraw Hill. ISBN0-07-041677-X.
- ^Liu, D.; Jin, H; Tang, C; Du, J (2010). 'Sulfur dioxide: a novel gaseous signal in the regulation of cardiovascular functions'. Mini-Reviews in Medicinal Chemistry. 10 (11): 1039–1045. doi:10.2174/1389557511009011039. PMID20540708. Archived from the original on 2013-04-26.
- ^Chen S, Zheng S, Liu Z, Tang C, Zhao B, Du J, Jin H (Feb 2015). 'Endogenous sulfur dioxide protects against oleic acid-induced acute lung injury in association with inhibition of oxidative stress in rats'. Lab. Invest. 95 (2): 142–156. doi:10.1038/labinvest.2014.147. PMID25581610.
- ^Tian H. (Nov 2014). 'Advances in the study on endogenous sulfur dioxide in the cardiovascular system'. Chin Med J. 127 (21): 3803–3807. PMID25382339.
- ^Yang R, Yang Y, Dong X, Wu X, Wei Y (Aug 2014). 'Correlation between endogenous sulfur dioxide and homocysteine in children with pulmonary arterial hypertension associated with congenital heart disease'. Zhonghua Er Ke Za Zhi (in Chinese). 52 (8): 625–629. PMID25224243.
- ^Liu D, Huang Y, Bu D, Liu AD, Holmberg L, Jia Y, Tang C, Du J, Jin H (May 2014). 'Sulfur dioxide inhibits vascular smooth muscle cell proliferation via suppressing the Erk/MAP kinase pathway mediated by cAMP/PKA signaling'. Cell Death Dis. 5 (5): e1251. doi:10.1038/cddis.2014.229. PMC4047873. PMID24853429.
- ^Wang XB, Jin HF, Tang CS, Du JB (16 Nov 2011). 'The biological effect of endogenous sulfur dioxide in the cardiovascular system'. Eur J Pharmacol. 670 (1): 1–6. doi:10.1016/j.ejphar.2011.08.031. PMID21925165.
- ^Liang Y, Liu D, Ochs T, Tang C, Chen S, Zhang S, Geng B, Jin H, Du J (Jan 2011). 'Endogenous sulfur dioxide protects against isoproterenol-induced myocardial injury and increases myocardial antioxidant capacity in rats'. Lab. Invest. 91 (1): 12–23. doi:10.1038/labinvest.2010.156. PMID20733562.
- ^Hoffman, R. V. (1990). 'm-Trifluoromethylbenzenesulfonyl Chloride'. Organic Syntheses.; Collective Volume, 7, p. 508
- ^Clarke L., K. Jiang, K. Akimoto, M. Babiker, G. Blanford, K. Fisher-Vanden, J.-C. Hourcade, V. Krey, E. Kriegler, A. Löschel, D. McCollum, S. Paltsev, S. Rose, P. R. Shukla, M. Tavoni, B. C. C. van der Zwaan, and D.P. van Vuuren, 2014: Assessing Transformation Pathways. In: Climate Change 2014: Mitigation of Climate Change. Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change [Edenhofer, O., R. Pichs-Madruga, Y. Sokona, E. Farahani, S. Kadner, K. Seyboth, A. Adler, I. Baum, S. Brunner, P. Eickemeier, B. Kriemann, J. Savolainen, S. Schlömer, C. von Stechow, T. Zwickel and J.C. Minx (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.
- ^Volcanic Gases and Their Effects. Volcanoes.usgs.gov. Retrieved on 2011-10-31.
- ^National Trends in Sulfur Dioxide Levels, United States Environmental Protection Agency.
- ^ abSulfur Dioxide. United States Environmental Protection Agency
- ^Hogan, C. Michael (2010). 'Abiotic factor' in Encyclopedia of Earth. Emily Monosson and C. Cleveland (eds.). National Council for Science and the Environment. Washington DC
- ^Lindeburg, Michael R. (2006). Mechanical Engineering Reference Manual for the PE Exam. Belmont, C.A.: Professional Publications, Inc. pp. 27–3. ISBN978-1-59126-049-3.
- ^FAQ’s About Sulfur Removal and Recovery using the LO-CAT® Hydrogen Sulfide Removal System. gtp-merichem.com
- ^Process screening analysis of alternative gas treating and sulfur removal for gasification. (December 2002) Report by SFA Pacific, Inc. prepared for U.S. Department of Energy (PDF) . Retrieved on 2011-10-31.
- ^May, Walter R. Marine Emissions AbatementArchived 2015-04-02 at the Wayback Machine. SFA International, Inc., p. 6.
- ^China has its worst spell of acid rain, United Press International (2006-09-22).
- ^Sulfur Dioxide[broken link] U.S. Environmental Protection Agency
- ^'NIOSH Pocket Guide to Chemical Hazards'.
- ^Shah PS, Balkhair T, Knowledge Synthesis Group on Determinants of Preterm/LBW Births (2011). 'Air pollution and birth outcomes: a systematic review'. Environ Int. 37 (2): 498–516. doi:10.1016/j.envint.2010.10.009. PMID21112090.CS1 maint: Multiple names: authors list (link)
- ^'Center for Science in the Public Interest – Chemical Cuisine'. Retrieved March 17, 2010.
- ^'California Department of Public Health: Food and Drug Branch: Sulfites'(PDF). Archived from the original(PDF) on July 23, 2012. Retrieved September 27, 2013.
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