Is sodium dithionite hazardous?

Hazard Class: 4.2 (Spontaneously Combustible) Sodium Dithionite is REACTIVE and contact with MOIST AIR, MOISTURE, WATER or HEAT can cause Sodium Dithionite to decompose, producing enough heat to ignite combustible materials. Use CO2 or dry sand for small fires. Use water in flooding quantities for large fires.

How toxic is sodium hydrosulfite?

Higher exposures may cause a build-up of fluid in the lungs (pulmonary edema), a medical emergency, with severe shortness of breath. ► Sodium Hydrosulfide can cause headache, nausea, vomiting, dizziness, muscle cramps, disorientation, lightheadedness, and passing out. Higher levels can cause coma, seizures and death.

How do you dispose of sodium dithionite?

Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber.

Is sodium hydrosulfite the same as sodium dithionite?

Sodium dithionite is a reductive bleaching chemical. It is also known as sodium hydrosulfite. Many dyes used to color paper can be effectively destroyed by reductive bleaching chemicals. Sodium dithionite is known to be effective for color stripping and can remove many types of dyes.

What is sodium hydrosulfite used for?

Sodium Hydrosulfite (or “Hydro”) is a universal reducing agent that is used for indigo dyeing. It is also used as a non-aggressive alternative to bleach for removing color from dyed fabrics and for whitening antique textiles.

What is the purpose of sodium dithionite?

Sodium dithionite (SDT) is a reducing agent used in conservation, mainly for iron stain removal from both organic and inorganic substrates, and occasionally to treat corroded copper and silver artifacts.

Is sodium hydrosulfide an acid?

It can be used to precipitate other metal hydroslfides, by treatment of aqueous solutions of their salts with sodium hydrosulfide. It is analogous to sodium hydroxide, and is a strong base.

Is sodium dithionite a reducing agent?

How do you make sodium hydrosulfite?

Sodium hydrosulfite is manufactured in the US by several process routes: the reaction of sodium formate (HCOONa) with caustic soda and sulfur dioxide, in an aqueous methanol solution; by reducing sodium bisulfite (NaHSO3) with electrolytically produced sodium amalgam (NaxHgx); or by reacting sulfur dioxide solution …

How do you use sodium hydrosulfite?

For use with Jacquard’s Pre-reduced Indigo: use 1 part indigo dye : 2 parts Sodium Hydrosulfite : 4 parts Soda Ash. (Use 1 gal/3.79 L of water for every 0.18/5 g of dye.) For use as a color remover: use in equal parts with Soda Ash (1:1) at 3-5% by dry weight of fabric.

Is Thiox toxic?

It can be irritating to the nose, throat, and airways and potentially paralyzing to breathing if inhaled in large quantities. Dyers with asthma should be especially cautious when using these reducing chemicals. Both “hydro” and “thiox” also release sulfur dioxide, which is considered to be damaging to the brain.

Is sodium dithionite soluble in water?

Sodium dithionite is highly soluble in water (182 g/L at 20°C) [164], but almost insoluble in organic solvents just as all the main group metal dithionites [60]. The other dithionite salt, [(C2H5)4N]2S2O4, is soluble in dimethylformamide, dimethylsulfoxide and acetonitrile [63].

Where did the sodium hydrosulfide safety bulletin come from?

They noted, however, that accident data are incomplete and there may have been additional deaths and injuries attributable to the chemical. The Safety Bulletin is an outgrowth of the Board’s investigation of a January 2002 accident involving sodium hydrosulfide that caused two deaths and eight injuries at an Alabama paper mill.

Is it safe to use sodium hydrosulfide in cooking?

Washington, DC, July 15, 2004 – The U.S. Chemical Safety and Hazard Investigation Board (CSB) today released a Safety Bulletin that warns of the dangers of sodium hydrosulfide and recommends safe practices to prevent accidents when handling the chemical.

What kind of reducing agent is sodium hydrosulfite?

It also possesses good stability in storage. Hydrosulfite, sometimes also referred to as dithionite, is a strong reducing agent. In the mill, usually sodium hydrosulfite is used (although zinc hydrosulfite was also used earlier).

How does sodium hydrosulfite decompose in hot water?

?) Sodium dithionite (also known as sodium hydrosulfite) is a white crystalline powder with a weak sulfurous odor. Although it is stable in the absence of air, it decomposes in hot water and in acid solutions . Raman spectroscopy and single-crystal X-ray diffraction studies reveal that the geometry of the dithionite anion is flexible.