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A7342512

Sulfur dioxide solution , Solvent: 0.4-0.6mg/L, analyze the standard products , 7446-09-5

CAS NO.:7446-09-5

Empirical Formula: O2S

Molecular Weight: 64.06

MDL number: MFCD00011450

EINECS: 231-195-2

Update time: 2022-07-08

PRODUCT Properties

Melting point: -73 °C (lit.)
Boiling point: -10 °C (lit.)
Density  1.25 g/mL at 25 °C (lit.)
vapor density  2.26 (21 °C, vs air)
vapor pressure  1779 mm Hg ( 21 °C)
FEMA  3039 | SULFUR DIOXIDE
solubility  soluble in H2O, EtOh, ethyl ether,chloroform
form  colorless gas
color  colorless
Odor Pungent odor detectable at 0.3 to 5 ppm
Odor Threshold 0.87ppm
Water Solubility  %H2O: 17.7 (0°C), 11.9 (15°C), 8.5 (25°C), 6.4 (35°C); % other solvents: 25, alcohol; 32, methanol [MER06]
Merck  13,9061
BRN  3535237
Exposure limits TLV-TWA 2 ppm (~5 mg/m3) (ACGIH), 5 ppm (OSHA and MSHA); IDLH 100 ppm (NIOSH).
Dielectric constant 17.6(-20℃)
Stability: Stable. Non-corrosive when dry to common materials except zinc; corrosive when wet. Incompatible with strong reducing or oxidizing agents, moisture, zinc and its alloys.

Description and Uses

Sulfur dioxide is a compound formed by the combination of the elements sulfur and oxygen. On a weight basis, the proportion of the elements is about I part sulfur to I part oxygen, or more exactly, 50.05 percent to 49.95 percent, respectively. At standard conditions of temperature and pressure, sulfur dioxide is a colorless gas with a characteristic pungent odor. It may be cooled and compressed to a colorless liquid, which, at one atmosphere pressure, boils at 14°F (10.0°C) and freezes at -104.6°F (-75.9°C). Sulfur dioxide liquid is heavier than water, and has a specific gravity of 1.436 at 32°F (0°C). As a gas, it is more than twice as heavy as air; its relative density is 2.2638 at atmospheric pressure and 32°F (0°C).
Sulfur dioxide is not flammable or explosive in either the gaseous or liquid state. It is a relatively stable chemical. Temperatures above 3632°F (2000°C) are required to bring about detectable decomposition of sulfur dioxide. Dry sulfur dioxide (less than 100 ppm water) is not corrosive to ordinary metals. However, in the presence of even small amounts of water, sulfur dioxide becomes corrosive to most metals, with exceptions including lead, Type 316 stainless steel, and certain alloys. Glass and certain plastics are also resistant to moist sulfur dioxide.

Sulfur dioxide is used as a bleaching andfumigating agent; as a disinfectant, for treat ing wood pulp for manufacturing paper, inmetal refining, for preserving food and vegetables, and as a reducing agent. It is a majorair pollutant and is produced when soft coal,oils, or other sulfur-containing substances areburned. Automobile exhaust gases also contribute to air pollution. Sulfur dioxide in theatmosphere reacts with moisture to form sulfurous acid, or is oxidized to sulfur trioxide,which forms sulfuric acid, causing acid rain.

Safety

Symbol(GHS) 
GHS04,GHS05,GHS06
Signal word  Danger
Hazard statements  H280-H314-H331
Precautionary statements  P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P410+P403
Hazard Codes  T
Risk Statements  23-34
Safety Statements  9-26-36/37/39-45
RIDADR  UN 2037 2.3
OEB B
OEL TWA: 2 ppm (5 mg/m3), STEL: 5 ppm (13 mg/m3)
WGK Germany  1
RTECS  WS4550000
4.5-31
DOT Classification 2.3, Hazard Zone C (Gas poisonous by inhalation)
HazardClass  2.3
Toxicity LC50 inhal (rat) 2520 ppm (6590 mg/m3; 1 h)
LCLO inhal (human) 1000 ppm (2600 mg/m3; 10 min)
PEL (OSHA) 5 ppm (13 mg/m3)
TLV-TWA (ACGIH) 2 ppm (5.2 mg/m3)
STEL (ACGIH) 5 ppm (13 mg/m3)
IDLA 100 ppm

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