General Description
AMMONIUM DICHROMATE(7789-09-5) is a bright orange red crystalline solid. AMMONIUM DICHROMATE(7789-09-5) is readily ignited and burns producing a voluminous green residue. If heated in a closed container, the container may rupture due to the decomposition of the material. AMMONIUM DICHROMATE(7789-09-5) may also act as a strong oxidizing agent if mixed with or contaminated with combustible material. AMMONIUM DICHROMATE(7789-09-5) is soluble in water.
Reactivity Profile
AMMONIUM DICHROMATE is an oxidizing reagent, AMMONIUM DICHROMATE readily reacts with reducing materials, in large quantity AMMONIUM DICHROMATE may produce a violent reaction. Direct exposure to heat or shock will explode it. When heated to decomposition AMMONIUM DICHROMATE emits toxic fumes of ammonia and nitrogen oxides [Sax, 9th ed., 1996, p. 205].
Air & Water Reactions
Water soluble.
Hazard
Dusts and solutions are toxic, irritating to
eyes and skin; dangerous fire risk. Strong oxidizing
agent may explode in contact with organic materi-
als. TLV: 0.05 mg(Cr)/m
3
; Confirmed human car-
cinogen.
Health Hazard
Inhalation causes irritation or ulceration of the mucous membranes of the nose, throat or respiratory tract. Respiratory irritation can produce symptoms resembling those of asthma. Continuing irritation of the nose may lead to perforation of the nasal septum. External contact can cause eye irritation and conjunctivitis, irritation and ulceration of skin wounds, and rash or external ulcers. If ingested, irritates mucous membrane and causes vomiting.
Potential Exposure
It is used in dyeing, leather tanning and
to make fireworks and chromic oxide; in lithography and photoengraving;
in manufacture of special mordants and catalysts.
First aid
If this chemical gets into the eyes, remove any
contact lenses at once and irrigate immediately for at least
15 minutes, occasionally lifting upper and lower lids. Seek
medical attention immediately. If this chemical contacts the
skin, remove contaminated clothing and wash immediately
with soap and water. Seek medical attention immediately.
If this chemical has been inhaled, remove from exposure,
begin rescue breathing (using universal precautions, including
resuscitation mask) if breathing has stopped and CPR if
heart action has stopped. Transfer promptly to a medical
facility. When this chemical has been swallowed, get medical
attention. Give large quantities of water and induce
vomiting. Do not make an unconscious person vomit.
Shipping
UN1439 Ammonium dichromate, Hazard Class:
5.1; Labels: 5.1-Oxidizer.
Incompatibilities
An unstable oxidizer; freezing/melting
point5(decomposes below MP) 180 C; decomposition
becomes self-sustaining and violent at about 225 C. Contact
with combustible, organic or other easily oxidized materials,
strong acids; hydrazine and other reducing agents; alcohols,
sodium nitrite may cause fire and explosions.
Chemical Properties
Ammonium dichromate is a combustible,
orange-red crystalline solid which is used in solution.
Chemical Properties
bright orange-red crystals
Waste Disposal
Consult with environmental
regulatory agencies for guidance on acceptable disposal practices.
Generators of waste containing this contaminant
(≥100 kg/mo) must conform with EPA regulations governing
storage, transportation, treatment, and waste disposal. Add a
large volume of a reductant solution (hypo, bisulfite or ferrous
salt and acidify with sulfuric acid). Neutralize when reduction
is complete and flush to sewer with large volume of water.
Occurrence
Bright orange-red monoclinic crystals; odorless; hygroscopic; decomposes at 180°C; density 2.115 g/cm3 at 25°C; readily dissolves in water (26.67 g/100 g at 20°C).
Purification Methods
It crystallises from weak aqueous HCl (ca 1mL/g). It decomposes rapidly on heating. (Possible carcinogen and is POISONOUS)
