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Coffeeshop Chit Chat - NEA: Vapour from oil spill not toxic woh</TD><TD id=msgunetc noWrap align=right> </TD></TR></TBODY></TABLE><TABLE class=msgtable cellSpacing=0 cellPadding=0 width="96%"><TBODY><TR><TD class=msg vAlign=top><TABLE border=0 cellSpacing=0 cellPadding=0 width="100%"><TBODY><TR class=msghead><TD class=msgbfr1 width="1%"> </TD><TD><TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=msghead vAlign=top><TD class=msgF width="1%" noWrap align=right>From: </TD><TD class=msgFname width="68%" noWrap>kojakbt_89 <NOBR></NOBR> </TD><TD class=msgDate width="30%" noWrap align=right>12:58 am </TD></TR><TR class=msghead><TD class=msgT height=20 width="1%" noWrap align=right>To: </TD><TD class=msgTname width="68%" noWrap>ALL <NOBR></NOBR></TD><TD class=msgNum noWrap align=right> (1 of 6) </TD></TR></TBODY></TABLE></TD></TR><TR><TD class=msgleft rowSpan=4 width="1%"> </TD><TD class=wintiny noWrap align=right>33791.1 </TD></TR><TR><TD height=8></TD></TR><TR><TD class=msgtxt>May 28, 2010
Vapour from oil 'not toxic'
Air samples show no unsafe chemicals: NEA
<!-- by line -->By Grace Chua
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Workers scooping up oil-soaked sand into garbage bags at East Coast Park yesterday. Some residents had complained of a smell coming from the oil spill. -- ST PHOTO: LAU FOOK KONG
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IT STINKS but it will not hurt, the National Environment Agency (NEA) yesterday assured residents still catching whiffs of the noxious vapours in the air from Tuesday's oil spill.
The agency said its twice-daily samples of the air along oil-soaked stretches of the East Coast beach have not shown up any chemicals to be concerned about.
These include toluene, benzene, xylene, styrene and 1,3-butadiene, solvents or components in the manufacture of plastics or other materials.
Crude oil, such as that from Tuesday's spill, contains these compounds.
The human nose can perceive foul odours at very low levels, before they can be picked up by instrumentation and well before they reach dangerous levels, said NEA.
For example, the chemical toluene can be smelled at 0.16 parts per million, it added.
But it can be detected only at one part per million - the equivalent of one drop of water in a 50-litre tank. The safe limit for toluene is 50 times that, or 50 parts per million.
'Our nose is an extremely sensitive instrument,' said NEA director-general of environmental pollution Joseph Hui. 'It can detect these chemicals at concentrations that cannot be detected by other instruments.'
When vaporised, oil can irritate the airways and trigger asthma. Exposure to high levels of volatile chemicals can cause irritation, nausea, dizziness and other effects, said allergy expert and paediatrician Lee Bee Wah.
The chemicals can constitute an occupational hazard for people who often work with these compounds in confined spaces, such as professional house painters.
Dr Lee commented that the current spill was not in an enclosed area, so the fumes from the spill were likely to disperse quite fast.
'Also, the spill is finite - it's not like the haze which can linger for a long time. Probably, the effects on the ecosystem are worse,' she added.
So far, she said, she had not seen any patients who complained of oil-related respiratory problems.
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Vapour from oil 'not toxic'
Air samples show no unsafe chemicals: NEA
<!-- by line -->By Grace Chua
<!-- end by line -->
<!-- end left side bar -->

<!-- story content : start -->
IT STINKS but it will not hurt, the National Environment Agency (NEA) yesterday assured residents still catching whiffs of the noxious vapours in the air from Tuesday's oil spill.
The agency said its twice-daily samples of the air along oil-soaked stretches of the East Coast beach have not shown up any chemicals to be concerned about.
These include toluene, benzene, xylene, styrene and 1,3-butadiene, solvents or components in the manufacture of plastics or other materials.
Crude oil, such as that from Tuesday's spill, contains these compounds.
The human nose can perceive foul odours at very low levels, before they can be picked up by instrumentation and well before they reach dangerous levels, said NEA.
For example, the chemical toluene can be smelled at 0.16 parts per million, it added.
But it can be detected only at one part per million - the equivalent of one drop of water in a 50-litre tank. The safe limit for toluene is 50 times that, or 50 parts per million.
'Our nose is an extremely sensitive instrument,' said NEA director-general of environmental pollution Joseph Hui. 'It can detect these chemicals at concentrations that cannot be detected by other instruments.'
When vaporised, oil can irritate the airways and trigger asthma. Exposure to high levels of volatile chemicals can cause irritation, nausea, dizziness and other effects, said allergy expert and paediatrician Lee Bee Wah.
The chemicals can constitute an occupational hazard for people who often work with these compounds in confined spaces, such as professional house painters.
Dr Lee commented that the current spill was not in an enclosed area, so the fumes from the spill were likely to disperse quite fast.
'Also, the spill is finite - it's not like the haze which can linger for a long time. Probably, the effects on the ecosystem are worse,' she added.
So far, she said, she had not seen any patients who complained of oil-related respiratory problems.
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