• acid rain
  • The Cabinet Council on Natural Resources and the Environment is considering a number of acid rain control options, ranging from a small $10 million-a-year research and lake-treatment program, to legislation requiring large cuts in sulfur-dioxide emissions across 48 states - a move that could cost $7 billion annually by 1993. (csmonitor.com)
  • Title IV of the 1990 Clean Air Act established the allowance market system known today as the Acid Rain Program. (wikipedia.org)
  • Caribbean
  • The element has traditionally been spelled sulphur in the United Kingdom, most of the Commonwealth including India, Malaysia, South Africa and Hong Kong, along with the rest of the Caribbean and Ireland, but sulfur in the United States, while both spellings are used in Australia, New Zealand and Canada. (eternal-lands.com)
  • 2000
  • IUPAC adopted the spelling "sulfur" in 1990, as did the Royal Society of Chemistry Nomenclature Committee in 1992 and the Qualifications and Curriculum Authority for England and Wales recommended its use in 2000. (eternal-lands.com)
  • Plants
  • In: Rennenberg H, Brunold C, De Kok LJ, Stulen I (eds), Sulfur Nutrition and Sulfur Assimilation in Higher Plants: Fundamental, Environmental and Agricultural Aspects. (springer.com)
  • In Phase I, half the total reductions were required by January 1, 1995, largely by requiring 110 electric power generating plants (261 units in 21 states) to cut sulfur dioxide emission rates to 2.5 lbs/million British thermal units (mmBtu). (wikipedia.org)
  • known
  • Being abundant in native form, sulfur was known in ancient times, being mentioned for its uses in ancient India, ancient Greece, China, and Egypt. (wikipedia.org)
  • Sulfur forms polyatomic molecules with different chemical formulas, the best-known allotrope being octasulfur, cyclo-S8. (wikipedia.org)
  • period
  • Units that installed flue-gas desulfurization equipment (e.g., scrubbers) or other "qualifying Phase I technology" which reduced sulfur dioxide emissions by 90%, qualified for a two-year extension of the 1995 deadline, provided they owned allowances to cover their total actual emissions for each year of the extension period. (wikipedia.org)
  • lower
  • Between its melting and boiling temperatures, octasulfur changes its allotrope again, turning from β-octasulfur to γ-sulfur, again accompanied by a lower density but increased viscosity due to the formation of polymers. (wikipedia.org)
  • Alternatively, utilizing bromine, sulfur hexafluoride can be synthesized from SF4 and CoF3 at lower temperatures (e.g. 100 °C), as follows: 2CoF3 + SF4 + (Br2) → SF6 + 2CoF2 + (Br2) There is virtually no reaction chemistry for SF 6. (wikipedia.org)
  • different
  • de Paiva, A. P. C. 2007, Effect of different doses of sulfur on voluntary intake of low-quality elephant grass and estimates of ruminal protozoa populations in crossbred heifers, Cienc.Agrotecnol. (koreascience.or.kr)
  • found
  • Though sometimes found in pure, native form, sulfur usually occurs as sulfide and sulfate minerals. (wikipedia.org)