3 Gasescertain conditions they can causeasphyxiation. If ventilation is poor,especially in confined spaces, gas canbuild up to dangerous concentrations.Inhaling such an atmosphere cancause loss of consciousness in seconds,because under these conditions thelungs actually remove oxygen from theblood.Argon, which can also be used as apurging gas to exclude air from the weldroot, is a particular hazard because it isdenser than air and can collect in pitsand other low-lying areas.Carbon dioxide is said to be a "chemicalasphyxiant" because it is not inert; aswell as lowering the amount of oxygenavailable in the atmosphere, it alsohinders the transport of oxygen inthe blood. The levels at which carbondioxide causes incapacity are relativelyhigh, and the risks from its use inwelding are comparable with thosefor simple asphyxiants such as argon,helium and nitrogen.Carbon monoxide is highly toxic.Early symptoms of carbon monoxidepoisoning include giddiness, headacheand mental confusion. Chronicsymptoms are not usually significantat the concentrations normallyencountered in welding.11
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