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Topic: Sulphide

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	Hydrogen Sulphide 1
		The hydrogen sulphide boundary is usually deepest in summer and shallowest in spring.
		Garkavaya (unpublished data) recently recorded hydrogen sulphide concentrations of 1.5 to 2.25 ml/l in the lower water column on the north-western shelf at depths of 10-30 m.
		Yet hydrogen sulphide on the shelf is still transitory, occurring primarily in summer and autumn, as intense water column mixing during winter and spring reoxygenates the bottom waters.
	www.grid.unep.ch /bsein/publish/h2s_1.htm (438 words)

	NASD: MANURE GAS -- HYDROGEN SULPHIDE
		Hydrogen sulphide is produced continuously in all un-aerated manure storage systems, including shallow barn gutters, underground storage tanks or outside manure holding ponds or lagoons.
		Because hydrogen sulphide is heavier than air, the gas has a tendency to accumulate on the surface of the manure.
		During agitation, hydrogen sulphide is released from the manure in the same manner as carbon dioxide is liberated after shaking a carbonated soft drink.
	www.cdc.gov /nasd/docs/d001501-d001600/d001535/d001535.html (1024 words)

	ERA Technology \| Impact of gaseous sulphides on electronic reliability - ERA Technology Ltd
		Hydrogen sulphide is well known as the classic "bad egg gas" of the school chemical laboratory, with its pungent, unpleasant and easily recognised smell, even at very low concentrations.
		Sulphide contact: Devices were used in steel plant, adjacent to blast furnaces that are certain to raise ambient levels of hydrogen sulphide, although no local measurements of its concentration were carried out.
		Sulphide contact: Contacts in an underground train system were not sealed against the environment and had operated for several years since the last service.
	www.era.co.uk /news/rfa_feature_03.asp (1338 words)

	DHI User Conference 1999, Sulfide production for Mouse Trap (Site not responding. Last check: 2007-09-19)
		Sulphide build-up in gravity sewers takes place mainly in large, slow flowing, pipes with insufficient re-aeration at relatively-high temperatures and in pressure mains, when the residence time of the wastewater is more than 1-2 hours.
		Sulphide production resulting from a sulphate reduction in gravity sewers takes place mainly in large, slow flowing, pipes with insufficient re-aeration at relatively-high temperatures and in pressure mains when the residence time for the wastewater is more than 1-2 hours (the total residence time for the wastewater being under anaerobic conditions).
		Sulphide production is of interest because an enhanced sulphide production can result in a number of problems, these being noxious odours, health risk, corrosion of concrete and metal constructions in the sewer network and inhibition of sewage treatment processes /2/.
	www.dhi.dk /softcon/papers/089/089.htm (2291 words)

	The Hindu : Sci Tech / Agriculture : Sulphide injury in rice
		The roots of freshly pulled out plants are fl in colour having a deposition of ferrous sulphide, whereas roots of the healthy plants are covered with a uniform and smooth light brown coating of ferric oxides and hydroxides.
		Accumulation of chemically reduced ferrous sulphide also imparts a fl tinge to the soil and emanation of the accumulated gas as small air bubbles can be seen when the soil is tilled.
		For severe sulphide injury either the flooded soil needs to be drained and allowed to dry for 7-10 days or allowed for intensive drying for 1-2 days to form hairline cracks which will provide oxygen supply to the roots.
	www.hinduonnet.com /seta/2004/11/25/stories/2004112500111600.htm (331 words)

	sulphide on Encyclopedia.com (Site not responding. Last check: 2007-09-19)
		Goldbrook Ventures Inc.: Exploration Update; Massive Sulphides Intersected on Belanger Property in the Raglan Region of Northern Quebec.
		Crowflight Identifies Deep Geophysical Anomalies for Potential Massive Sulphides at AER Kidd Property in the Sudbury Basin.
		Rubicon Announces New Massive Sulphide Intersection And Assays From RW Zone At Palmer, Alaska
	www.encyclopedia.com /html/X/X-sulphide.asp (272 words)

	Chris Deuchar's Hydrogen Sulphide Page
		Hydrogen Sulphide is a respiratory inhibitor, ie it affects the part of the brain which controls the lungs, and is similar in action to hydrogen cyanide - used in American gas chambers.
		Hydrogen Sulphide is however highly reactive and will combine rapidly with other elements to form eg, Sulphur Dioxide which has been heavily researched in recent years in connection with environmental problems such as acid rain and increasing respiratory problems.
		The emission of Hydrogen Sulphide from car exhausts is (arguably) worse than some of the emissions the converters were designed to eradicate and the intention of this project was therefore to obtain absolute evidence of this problem against a background of increasing converter use.
	www.nottingham.ac.uk /%7Esbzcd/h2s-page.htm (691 words)

	Water Science and Technology 37:1 (1998) 115-122 - Anette sy et al. - The effect of sulphide and organic matter on the ...
		Septic wastewater, characterised by the appearance of sulphide, is known to cause problems in sewage systems (corrosion and odour), at treatment plants (e.g.
		Sulphide formation in sewers may be prevented by increasing the redox potential, either by oxygen/air injection (aerobic conditions) or dosage of nitrate (anoxic conditions).
		The results show that a sulphide concentration of 0.5 mg/l had a considerable negative effect on the nitrification activity.
	www.iwaponline.com /wst/03701/wst037010115.htm (196 words)

	Hydrogen Sulphide 2
		This undoubtedly led to increases in hydrogen sulphide in the bottom waters, although measurements of hydrogen sulphide are much less abundant than measurements of oxygen levels.
		On the north-western shelf hydrogen sulphide concentrations may decline as measures are implemented to reduce the nutrient loading.
		In the deep Black Sea the hydrogen sulphide layer appears relatively stable, but large changes in fresh water inflow or physical mixing processes may produce changes in the hydrogen sulphide boundary, which may have a negative impact on the ecosystem as a whole (Aubrey et al., 1996 b).
	www.grid.unep.ch /bsein/publish/h2s_2.htm (371 words)

	Measurement of dissolved H2S, (hydrogen sulphide), in difficult applications such as tanneries, circuit board waste and ... (Site not responding. Last check: 2007-09-19)
		Sulphide levels are usually reduced to between 0.5 and 10ppm.
		When sulphides occur they can cause damage to concrete structures, they can lead to septic condition and create “fl primary tanks” and are also the primary cause of odour problems.
		Measurement of sulphides in water has also sometimes been carried out using selective ion electrodes, while this method is sensitive, such system require frequent zeroing and calibration adjustment.
	www.edie.net /products/view_entry.asp?ID=1063 (637 words)

	Hydrogen Sulphide
		Hydrogen sulphide is not merely a smelly nuisance from stink bombs or rotten eggs.
		Hydrogen Sulphide is a potent chemical asphyxiant, combining with haemoglobin and with cytochromes and thus rapidly stopping oxygen from access to cellular metabolism (just like gases such as carbon monoxide and hydrogen cyanide).
		Hydrogen Sulphide is very foul smelling but very quickly paralyses the sense of smell, and can go on to overcome the victim and eventually cause death.
	www.agius.com /hew/resource/h2s.htm (282 words)

	Volcanic hosted massive sulphide and gold deposits in the Skellefte district, Sweden and western Finland (Site not responding. Last check: 2007-09-19)
		In the Skellefte district massive sulphide ore is extracted from six mines (Långdal, Kankberg, Åkulla östra, Renström, Petiknäs, and Kristineberg) and gold ore is mined in one open pit operations at Björkdal and underground at Åkerberg.
		The massive sulphide deposits in the Skellefte district were deformed together with the supracrustal rocks, but some differences in structural expression can be observed between the sulphides and the surrounding volcanic pile.
		The youngest sulphide mineralisation is a Pb-Ag-Sb mineralisation with diffuse "clouds" of galena.
	www.gsf.fi /info/OG41FULL.HTML (20525 words)

	Discovery of Germanium
		I realized only later that germanium really was present in the sodium sulphide solution but precipitated as the sulphide only after adding much acid, because it is considerably soluble in acid-free liquids and thus, once precipitated, could not be washed with water except with great losses or even complete disappearance (by dissolution).
		Leaving the sulphur behind, germanium sulphide is dissolved, and when the solution is then strongly acidified by hydrochloric acid, a white, voluminous precipitate is obtained that cannot be mistaken for sulphur.
		By adding the hydrochloric acid slowly in drops, first antimony sulphide, then arsenious sulphide are separated; after filtration, a solution is obtained from which snow-white germanium sulphide precipitates upon further, ample addition of hydrochloric acid.
	dbhs.wvusd.k12.ca.us /webdocs/Chem-History/Disc-of-Germanium.html (912 words)

	Hydrogen Sulphide Production (Site not responding. Last check: 2007-09-19)
		The sulphide concentration is the limiting factor in the release of hydrogen sulphide to the sewer walls so that corrosion may occur.
		The released hydrogen sulphide may cause corrosion to the wall of the concrete pipe.
		The hydrogen sulphide is oxidized in the aerobic layer on the wall of the pipe to form sulphuric acid which may corrode the pipe as it trickles down the wall of the pipe.
	www.ocpa.com /manual/pi_11.htm (769 words)

	Deposition and characterization of germanium sulphide glass planar waveguides
		Germanium sulphide glass thin films have been deposited on CaF2 and Schott N-PSK58 glass substrates directly by means of chemical vapor deposition (CVD).
		The deposition rate of germanium sulphide glass film by this CVD process is estimated about 12 µm/hr at 500oC.
		The refractive index of germanium sulphide glass film measured by prism coupling technique was 2.093±0.008 and the waveguide loss measured at 632.8nm by He-Ne laser was 2.1±0.3 dB/cm.
	www.opticsexpress.org /abstract.cfm?URI=OPEX-12-11-2501 (411 words)

	Baccarat Glass from the Glass Encyclopedia
		The Bohemian/Venician technique of embedding millefiori canes was taken over by Baccarat in the 1840s and their lead crystal glass paperweights with millefiori designs surpass anything produced in that period from Bohemia or Venice.
		The technique of embedding cameo sulphides in paperweights like the bust of Lafayette shown left, was raised to a fine art by Baccarat in the early 19th century, and continues to be used today.
		Sulphides: the art of Cameo Incrustation by Paul Jokelson, 1968.
	www.glassencyclopedia.com /Baccaratglass.html (648 words)

	Redfern Resources Ltd. - Official Website
		Thinner portions of the sulphide lenses extend into the limbs of this structure and into the F anticline to the west.
		The G lens which occurs in the fold limb east of the 5300E fault is interpreted to be a fault offset of the main H/AB2 lens within the main H syncline structure.
		This area was explored partially in 2003 and yielded a new massive sulphide lens to the west of the main deposit.
	www.redfern.bc.ca /projects/tulsequah/exploration_resources.html (1671 words)

	Ventilatory and metabolic responses to hypoxia and sulphide in the lugworm Arenicola marina (L.) -- Wohlgemuth et al. ...
		Ventilatory and metabolic responses to hypoxia and sulphide in the lugworm Arenicola marina (L.) -- Wohlgemuth et al.
		Ventilatory and metabolic responses to hypoxia and sulphide in the lugworm Arenicola marina (L.)
		A decrease in P(O2) in the presence of 27 or 117
	jeb.biologists.org /cgi/content/abstract/203/20/3177 (373 words)

	Business Wire: Starfield Resources Inc.: PGE-Rich Massive Sulphide `119 Zone' Discovery Now Drill Tested 400 Meters ... (Site not responding. Last check: 2007-09-19)
		These sulphide horizons are clearly remobilized from the gabbro-hosted massive sulphide body and as such may be similar to the 64.45 meter interval of semi-massive to massive sulphides encountered in footwall gneissic rocks in hole 01-74 completed in the 2001 season.
		This intersection occurs approximately 140 meters down-dip of the sulphide lenses encountered in hole 02-137.
		The 400-meter length of gabbro containing the newly-discovered massive sulphide horizons of the "119 Zone" is coincident with a portion of a 1,600 meter long UTEM geophysical anomaly.
	www.findarticles.com /p/articles/mi_m0EIN/is_2002_Oct_23/ai_93259825 (893 words)

	HYDROGEN SULPHIDE, FLUORIDES AND OTHER WATER PROBLEMS (Site not responding. Last check: 2007-09-19)
		As obnoxious as the taste and odour of hydrogen sulphide is, these are the only two problems it presents.
		Hydrogen sulphide is more common to well waters than to surface water supplies.
		Low to moderate concentrations of hydrogen sulphide can be eliminated through use of an oxidizing filter of the same type satisfactory for iron removal.
	www.cwqa.com /html/reportc1.html (3910 words)

	Sunday Times - South Africa's best selling newspaper (Site not responding. Last check: 2007-09-19)
		Professor Liza Bornman, a biochemist from the Rand Afrikaans University, said hydrogen sulphide was a very toxic gas which coexisted with sulphur dioxide in the atmosphere and could lead to death after high-level exposure.
		Bornman said hydrogen sulphide was released into the air as a result of a number of industrial processes, including those related to the production of petroleum.
		"I should think hydrogen sulphide is a health risk and I am very upset with the council for allowing this pollution to persist," she said.
	www.sundaytimes.co.za /2003/03/09/news/gauteng/njhb01.asp (860 words)

	!New Mineral Rhenium Sulphide ReS2, Rheniit from fumarol fields, Kudriavyi volcano, Iturup, Kuril islands, Russia.
		Rhenium sulphide still has no own mineral name, but scientists and mineral collectors call it as rhenite, rheniit, rheniite or kurilite.
		We observe selective accumulation of pure rhenium sulphide from fumarol gas that has rhenium concentration is near to middle in Earth crust (2-8 ppb).
		An unknown sulphide contained 45-wt.% of rhenium was diagnosed.
	www.cnt.ru /users/yakushev/rhenium (1453 words)

	The contribution of sulphate reducing bacteria and 5-aminosalicylic acid to faecal sulphide in patients with ulcerative ...
		The contribution of sulphate reducing bacteria and 5-aminosalicylic acid to faecal sulphide in patients with ulcerative colitis -- Pitcher et al.
		The contribution of sulphate reducing bacteria and 5-aminosalicylic acid to faecal sulphide in patients with ulcerative colitis
		for hydrogen sulphide as a metabolic toxin in ulcerative colitis
	gut.bmjjournals.com /cgi/content/abstract/46/1/64 (588 words)

	Globeinvestor.com: Conquest Resources Limited: Sulphide Zone With Gold Values Discovered At Alexander Project, Red Lake
		The Sulphide Zone and gold mineralization are believed to be similar to the sulphide zones, which were the host of Goldcorp'soriginal Red Lake Mine from 1945 until the discovery of the High Grade Zone at depth in 1995.
		The Sulphide Zone comprises massive and disseminated pyrite, pyrrhotite and minor arsenopyrite which occurs in an altered mafic volcanic sequence along the footwall contact of a mafic intrusive body.
		Holes CR-04-28 and 29 did not intersect the projected extension of the Sulphide Zone to the southeast, suggesting that it may be offset by faulting or may occur at a deeper level.
	www.globeinvestor.com /servlet/WireFeedRedirect?cf=GlobeInvestor/config&vg=BigAdVariableGenerator&date=20050125&archive=ccnm&slug=0125088n (1103 words)

	Copper sulphide nanowires forge ahead (May 2002) - News - nanotechweb.org
		The scientists from Zhongshan University and the Hong Kong University of Science and Technology grew crystalline copper sulphide nanowires by a gas–solid reaction at room temperature.
		After the reaction, the surface of the copper appeared fl and fluffy due to the formation of dense copper sulphide nanowire arrays.
		Xu reckons that crystalline copper sulphide nanowire arrays could be in commercial devices in the next three to five years.
	www.nanotechweb.org /articles/news/1/5/7/1 (330 words)

	The Open Door Web Site : Chemistry : A Sulphur Cycle
		Once the iron II sulphide has cooled down dilute hydrochloric acid is added to it.
		This is done in a fume cupboard since one of the products, hydrogen sulphide gas, has a pungent odour similar to bad eggs.
		The hydrogen sulphide gas is collected in a gas jar.
	www.saburchill.com /chemistry/chapters/chap035.html (155 words)

	The contribution of sulphate reducing bacteria and 5-aminosalicylic acid to faecal sulphide in patients with ulcerative ...
		Sulphide impairment of substrate oxidation in rat colonocytes: a biochemical basis for ulcerative colitis?
		Hydrogen sulphide produces diminished fatty acid oxidation in the rat colon in vivo: implications for ulcerative colitis.
		Hydrogen sulphide induced damage to the colonic mucosal barrier in the rat [abstract].
	gut.bmjjournals.com /cgi/content/full/46/1/64 (5492 words)

	Business Wire: Barker Minerals Massive Sulphide Projects Update. @ HighBeam Research (Site not responding. Last check: 2007-09-19)
		An effort is being made to determine the origin of the "felsite", as this has a bearing on the style of massive sulphide deposits that may exist in relation to this unit on the Company's property.
		Since massive sulphide deposits tend to occur in clusters, the Company's chances for discovery of additional massive sulphide mineralization at other target areas throughout the Frank Creek project area may be enhanced.
		The presence of volcanogenic massive sulphides at the Ace, Frank Creek, Peacock and SCR properties shows that potential exists for massive sulphide deposits across the entire width of the Barkerville terrane.
	highbeam.com /library/doc0.asp?DOCID=1G1:94387728&... (1118 words)

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