4220 Flow Meter
Appendix D General Safety Procedures
D-9
Sludge
Gas
—*** Mostly a simple
asphyxiant. May
be practically
odorless, taste-
less.
Variable Will not support
life.
No data. Would
vary widely with composition.
5.3 19.3 Near top of
structure.
From
digestion
of sludge.
See compo-
nents.
Sulfur
Dioxide
SO2Colorless, pun-
gent odor. Suffo-
cating, corrosive,
poisonous,
non-flammable.
2.26 Inflammation of
the eyes. 400 to
500 ppm imme-
diately fatal.
50
to
100
10 — — At bottom, can
combine with
water to form
sulfurous acid.
Industrial
waste,
combus-
tion, com-
mon air
pollutant.
Detectable
taste and odor
at low concen-
tration.
Tolu ene C 5H12
to
C9H20
Colorless, ben-
zene-like odor.
3.14 At 200-500 ppm,
headache, nau-
sea, bad taste,
lassitude.
200 100 1.27 7.0 At bottom. Solvent. Combustible
gas indicator.
Turpentine C10H16 Colorless, Char-
acteristic odor.
4.84 Eye irritation.
Headache, diz-
ziness, nausea,
irritation of the
kidneys.
— 100 At bottom. Solvent,
used in
paint.
1. Detectable
odor at low
concentration
s.
2.Combustible
gas indica-
tor.
Xylene C8H10 Colorless, flam-
mable
3.66 Narcotic in high
concentrations.
less toxic than
benzene.
— 100 1.1 7.0 At bottom. Solvent Combustible
gas indicator.
* Percentages shown represent volume of gas in air.
** For concentration over 0.3%.
***Mostly methane and carbon dioxide with small amounts of hydrogen, nitrogen, hydrogen sulfide, and oxygen; occasionally traces of carbon monoxide.
Table D-1 Hazardous Gases (Continued)
Gas Chemical
Formula
Common
Properties
Specific
Gravity
or Vapor
Density
Air =1
Physiological
Effect
Max
Safe 60
Min. Exposure
ppm
Max. Safe
8 Hour
Exposure
ppm
Explosive
Range (% by
vol. in air)
Limits
lower/upper
Likely
Location
of
Highest
Concentration
Most
Common
Sources
Simplest and
Cheapest
Safe Method
of Testing