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
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 |
| F | 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 |
