Сульфид железа (FeS)

87.91

87.907013

215-268-6

DTXSID5061665

Colorless hexagonal crystals when pure; usually gray to brownish-black lumps, rods or granular powder; trimorphic with transition points @ 135 and 325 °C|Dark-brown or black metallic pieces, sticks, or granules

28309011

32.09000

0.64570

Grayish-black Sticks

4.84 g/cm³

1194 °C

Deomposes

soluble in water(0.0062g/L ),in acids with evolution of hydrogen sulfide. Insoluble in nitric acid.

Storage temperature: no restrictions.

Decomposes in hot water|Oxidized by moist air to S and Fe3O4.|Standard molar enthalpy (heat) of formation at 298.15 deg K is -100.0 kJ/mol (crystal); Standard molar Gibbs energy of formation at 298.15 deg K is -100.4 kJ/mol (crystal); Standard molar entropy at 298.15 deg K is 60.3 J/mol/K (crystal); Molar heat capacity at constant pressure at 298.15 deg K is 50.5 J/mol/K (crystal)|Molar enthalpy (heat) of fusion 31.5 kJ/mol at 1188 °C|Sugar, glycerin, & many organic hydroxy acids hinder precipitation. In neutral solution, soluble carbonates, phosphates, & oxalates produce precipitation. /Ferrous salts/

III

4.1

UN 3077 9/PG 3

3

31-50

60-61-50

N

Stable. Incompatible with strong acids, strong bases, metal oxides. Avoid moisture.

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

The use of steel equipment in conjunction with hydrogen sulfide or volatile sulfide compounds will cause it to spontaneously explode in air.|Violent reaction with lithium when heated above 260 °C.|Hydrogen peroxide reacts vigorously with ... ferrous sulfide.

.../Ferrous sulfide/ is occasionally formed unintentionally when materials containing sulfur are treated in iron and steel vessels- eg in petroleum refineries. If the plant is opened and the deposit of ferrous sulfide is exposed to air, its exothermic oxidation may raise temp of gases and vapors in the vicinity. A fine water spray should be directed on such deposits until flammable vapors have been removed by purging. Similar problems may occur in pyrite mines where the air temperature is increased by a continuous slow oxidation of ore.

SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.|All ... /iron/ preparations should be kept in child-proof bottles. /Iron preparations/

If inhaled, iron is a local irritant to the lung and gastrointestinal tract. /Iron compounds/

Recommended Exposure Limit: 10 Hr Time-Weighted Avg: 1 mg/cu m. /Iron salts (soluble, as Fe)/