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| | AMMONIUM CHROMATE Basic information |
| | AMMONIUM CHROMATE Chemical Properties |
| Melting point | 180°C (dec.) | | density | 1.91 g/mL at 25 °C (lit.) | | solubility | H2O: 1 M at 20 °C, clear, yellow | | form | Crystalline | | Specific Gravity | 1.91 | | color | Yellow-orange | | Water Solubility | Soluble in water. Slightly soluble in liquid ammonia, acetone, methanol. Insoluble in ethanol. | | Merck | 14,510 | | Exposure limits | ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin)
OSHA: Ceiling 0.1 mg/m3
NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3 | | CAS DataBase Reference | 7788-98-9(CAS DataBase Reference) | | EPA Substance Registry System | Ammonium chromate (7788-98-9) |
| | AMMONIUM CHROMATE Usage And Synthesis |
| Chemical Properties | Ammonium chromate is a yellow crystalline
compound which can be used in solution, which is yellow
with an ammonia odor. | | Uses | Sensitizing gelatin in photography, in textile printing pastes, in fixing chromate dyes on wool, and as a reagent in analytical chemistry. | | Uses | Ammonium chromate, is used in photography as a sensitizer for gelatin coatings. It's often used in photography, textile printing, and fixing chromate dyes on wool. It is also used as an analytical reagent, catalyst. | | Uses | Reagent for the preparation of a solid heterogeneous oxidizing agent for liquid phase oxidation of alcohols. | | Hazard | Toxic by inhalation, strong irritant. Con-
firmed carcinogen.
| | Safety Profile | A poison. Mutation data reported. See also CHROMIUM COMPOUNDS. A powerful oxidizer. An explosion hazard when shocked or heated. When heated to decomposition it emits toxic fumes of NH3, Cr03, and NOx. Incompatible with reducing agents. | | Potential Exposure | It is used to inhibit corrosion and in
dyeing, photography and many chemical reactions. Used as
a fungicide and fire retardant. | | Shipping | UN3288 Toxic solids, inorganic, n.o.s., Hazard
Class: 6.1; Labels: 6.1-Poisonous materials, Technical
Name Required. | | Purification Methods | Crystallise it from weak aqueous ammonia (ca 2.5mL/g) by cooling from room temperature. It loses NH3 on heating to form ammonium dichromate. POISONOUS. | | Incompatibilities | A strong oxidizer and an explosive.
Contact with combustible, organic and other readily oxidizable
substances may cause fire and explosions. Hydrazine,
other reducing agents. Corrosive to metals. | | 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.
Addition of a large volume of a reducing agent solution
(hypo, bisulfite or ferrous salt, and acidify with 3 M sulfuric
acid). When reduction is complete, flush to drain with
large volumes of water. |
| | AMMONIUM CHROMATE Preparation Products And Raw materials |
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