Transcript Sulfur
Sulfur Physical - chemical properties Chemical symbol S, (Sulphur) Atomic number : 16 Ar: 32,065 Density 1,960 g/cm3 Melting point: 115, °C - 388,4 K Boiling point: 444,67 °C - 717,87 K Structure History Sulfur was known in ancient times, and is referred to in the Bible. Early alchemists gave sulfur its own alchemical symbol which was a triangle at the top of a cross. In 1867 sulfur was discovered in underground deposits in Louisiana and Texas. Biological role Sulfur is found in: amino acids -cysteine methionine polypeptides proteins enzymes cells DNA bacteria Applications Sulfur is used in: batteries detergents vulcanization of rubber fungicides manufacture of phosphate fertilizers bleaching paper preservative in wine and dried fruit gunpowder fireworks photographic fixing agents laxative exfoliant Environmental Impact Industry Sulfur dioxide SO2 Acid rain Damage to the natural environment and chemical weathering Occurrence in earth’s crust (0,03 - 0,09 %) in oceans and seas (csulfur = 900 mg/l) in the universe (1 atom of sulfur come to 60 000 atoms of hydrogen) in volcanic regions and hot springs In ores: pyrite (iron sulfide), cinnabar (mercury sulfide), galena (lead sulfide), sphalerite (zinc sulfide) and stibnite (antimony sulfide), gypsum (calcium sulfate), barite (barium sulfate) spring – pramen, vřídlo Sulfur in other languages english: sulfur latin: sulphur czech: síra croatian: sumpor french: soufre german: dchwefel italian: solfo norwegian: svovel portuguese: enxôfre spanish: azufre swedish: svavel References: http://en.wikiedia.org./wiki/Sulfur http://www.doktorka.cz/run/reydsys/vitaminy/rart.asp?id=1698 http://www.webelements.com/webelements/ele ments/text/S/key.html http://chemlab.pc.maricopa.edu/periodic/S.html http://environmentalchemistry.com/yogi/periodi c/S.html http://www.scescape.net/~woods/elements/sulf ur.html Thank you for your attention! Presentation was prepared by: Eva Jochimová Helena Šmídová 3.11.2005 Brno University of Technology