Английский язык для инженеров сварочного производства. Гричин С.В - 99 стр.

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99
Chart 2
Occupational Exposure Limits
Substances Assigned a Maximum Exposure
Limit
8hr TWA
15 min
STEL
Beryllium
0.002
mg/m
3
Cadmium oxide fume (as Cd)
0.025
mg/m
3
Chromium VI compounds (as Cr)
0.05 mg/m
3
Cobalt 0.1 mg/m
3
Nickel (insoluble compounds) 0.5 mg/m
3
Substances Assigned an Occupational
Exposure Standard
Welding fume 5 mg/m
3
Fluoride (as F) 2.5 mg/m
3
Iron oxide, fume (as Fe) 5 mg/m
3
10 mg/m
3
Zinc oxide, fume 5 mg/m
3
10 mg/m
3
Manganese, fume (as Mn) 0.5 mg/m
3
Ozone 0.2 ppm
Nitric Oxide 1 ppm
Nitrogen dioxide 1 ppm
Chromium III compounds (as Cr) 0.5 mg/m
3
Barium compounds, soluble (as Ba) 0.5 mg/m
3
Carbon monoxide 50 ppm 300 ppm
Copper fume 0.2 mg/m
3
If the fume contains only substances such as iron or aluminium which
are of low toxicity, an 8 hour (TWA) OES of 5mg/m3 applies; this figure is
the average concentration of particulate fume that should not be exceeded in
an 8 hour day.

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