7789-09-5 Usage
Description
Ammonium dichromate is a bright orange-red crystalline solid that is combustible, readily soluble in water, and acts as a strong oxidizing agent. It consists of ammonium ions and dichromate ions and is used in various applications across different industries.
Uses
Used in Photo Engraving:
Ammonium dichromate is used as a photoactive site for photo engraving, enabling the creation of detailed images on various surfaces.
Used in Dye Mordant:
It is used as a mordant in dyeing pigments, helping to fix the dye to the material and improve colorfastness.
Used in Pigments:
Ammonium dichromate is used as an intermediate in the manufacture of pigments, contributing to the production of vibrant and stable colorants.
Used in Pickling:
It is used in the pickling process to clean and prepare metal surfaces for further processing or protection.
Used in Photography:
Ammonium dichromate is used in photography for sensitizing gelatin, albumen, gums, and other colloids used for pigment processes, making it more sensitive than potassium dichromate.
Used in Process Engraving:
It is used in process engraving to etch intricate designs and patterns onto various materials.
Used in Lithography:
Ammonium dichromate is used in lithography for creating printing plates and transferring images onto different surfaces.
Used in Pyrotechnics:
It is used in pyrotechnics, such as Vesuvius fire, for creating bright and colorful effects.
Used in Glazes for Porcelain and China Wares:
Ammonium dichromate is used in the formulation of glazes for porcelain and china wares, enhancing their appearance and durability.
Used in Leather Industry:
It is used in the leather industry for tanning, helping to preserve and color the leather.
Used in Oil Industry:
Ammonium dichromate is used in the oil industry for purification processes.
Used in Production of Phosphor Raster Television Screens:
It is involved in the production of phosphor raster television screens and other devices, acting as the photoactive site.
Used in Oxidimetry Standard:
Ammonium dichromate is used as an oxidimetric standard for various analytical applications.
Used as a Source of Pure Nitrogen:
Especially in the laboratory, ammonium dichromate serves as a source of pure nitrogen.
Used in Catalysts and Porcelain Finishes:
It is used as a catalyst and in the formulation of special mordants, as well as in porcelain finishes.
Used in Combustion Synthesis of Perovskite LnCrO3 Powder:
Ammonium dichromate is used in the combustion synthesis of perovskite LnCrO3 powder, a material with potential applications in various fields.
Used in Oxidation of Hydroquinones, Catechols, and Phenols:
It is used for the oxidation of hydroquinones, catechols, and phenols, which are important chemical reactions in various industries.
References
Havard, Jennifer M., et al. "Design of Photoresists with Reduced Environmental Impact. 1. Water-Soluble Resists Based on Photo- Cross-Linking of Poly(vinyl alcohol)." Plos One 8.4(1999):-.
Kingsley, J. J., and L. R. Pederson. "Combustion synthesis of perovskite LnCrO3 powders using ammonium dichromate." Materials Letters 18.1-2 (1993): 89-96.
Fischer, Alfred, and George N. Henderson. "Oxidation of hydroquinones, catechols, and phenols using ceric ammonium nitrate and ammonium dichromate coated on silica: an efficient and convenient preparation of quinones." Synthesis 1985.6/7 (1985): 641 -643.
Suzuki, S. "Determination of Chromium Atom Density on Deep UV Exposed Ammonium-Dichromated Gelatin Films with Ultraviolet Absorption Spectra." Journal of the Electrochemical Society135.10 (1988):2615-2620.
Air & Water Reactions
Water soluble.
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].
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.
Safety Profile
Confirmed human carcinogen. Poison by inhalation, ingestion, skin contact, and subcutaneous routes. See also CHROMIUM COMPOUNDS. An unstable oxidizer. Moderately flammable; reacts with reducing agents.
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.
Shipping
UN1439 Ammonium dichromate, Hazard Class:
5.1; Labels: 5.1-Oxidizer.
Purification Methods
It crystallises from weak aqueous HCl (ca 1mL/g). It decomposes rapidly on heating. (Possible carcinogen and is POISONOUS)
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.
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.
Check Digit Verification of cas no
The CAS Registry Mumber 7789-09-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 9 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7789-09:
(6*7)+(5*7)+(4*8)+(3*9)+(2*0)+(1*9)=145
145 % 10 = 5
So 7789-09-5 is a valid CAS Registry Number.
InChI:InChI=1/2Cr.2H3N.7O/h;;2*1H3;;;;;;;/q;;;;;;;;;2*-1/p+2/rCr2O7.2H3N/c3-1(4,5)9-2(6,7)8;;/h;2*1H3/q-2;;/p+2
This product is a nationally controlled contraband, and the Lookchem platform doesn't provide relevant sales information.