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31 In 1856 he turned to technical chemistry, especially the problem of recovering sulphur from alkali waste.

32 As the sulphur finds its way into his lungs, he will become dizzy and nauseated.

33 Slates eventually decay because of their reaction with weak acids formed from sulphur and other atmospheric pollutants dissolved in rainwater.

34 The total removal rate shot up to 27 percent an hour, depositing the sulphur in a concentrated drizzle.

35 Agricultural students learnt that the dilute rain of sulphur from power stations was just useful extra fertiliser.

36 No sulphur deficiency has yet been detected as a result of falling atmospheric levels but there is a need for continued vigilance.

37 Nox, together with sulphur dioxide, is one of the leading contributors to acid rain pollution.

38 Government officials have acknowledged that existing policies to limit acidic emissions - notably of sulphur dioxide - are inadequate.

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39 The sulphur dioxide level in Belfast was 32 parts per billion while the nitrogen dioxide level was 48.

40 The gas is cleaned prior to burning and the sulphur dioxide and nitrogen dioxide, thought to contribute to acid rain, removed.

41 Sulphur dioxide emissions would also increase if that strategy were implemented.

42 The result has been a halving of sulphur dioxide emissions in the flue gases..

43 This stipulates that emissions of sulphur dioxide must be cut to 10 million tonnes below 1980 levels by the year 2000.

44 Other systems do not need large amounts of limestone and produce usable pure sulphur or acid rather than waste.

45 The government is committed to reducing sulphur dioxide emissions by 60 percent to their 1980 levels by 2005.

46 All this beneath a canopy of sulphur and a bedlam of sounds, like confusion confounded.

47 The islands are also renowned for their thermal springs and sulphur baths.

48 The landscape is a stony desert, smeared here and there with sulphur compounds.

49 While its petrol-engined equivalent must have unleaded fuel, the diesel catalyser will only become effective when sulphur levels drop.

50 Recorded emissions of sulphur dioxide were 2.67 million tonnes in 1992, while nitrous oxides totalled 701,645 tonnes.

51 The sky had turned streaky, the atmosphere raw, too much sulphur in it.

52 Sulphur bacteria may be present below the anoxic zone, reducing sulphate ions and liberating hydrogen sulphide.

53 Just as you can remove sulphur from power station emissions so you can do the same with carbon dioxide.

54 The sulphur was burned off, thus producing a lead oxide which then had to be reduced leaving behind the pure lead.

55 To avoid further damage to sensitive ecosystems, sulphur and nitrogen oxide emissions must be cut by 90 percent.

56 The process uses a natural gas flame to break down the effluent into sulphur dioxide.

57 When the wetlands are drained the iron pyrites in the soil are exposed to air and form sulphur acid.

58 Levels of sulphur dioxide in the air reached 2,400 microgrammes per cubic metre over the weekend.

59 Various elements, such as iron, titanium, manganese and sulphur can be oxidized to form oxides or hydroxides.

60 Uranium, selenium and calcium are concentrated in cell walls whereas bismuth and sulphur are concentrated within the cells.