Natriumdichromat Dihydrat Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R45:Kann Krebs erzeugen.
R46:Kann vererbbare Schäden verursachen.
R60:Kann die Fortpflanzungsfähigkeit beeinträchtigen.
R61:Kann das Kind im Mutterleib schädigen.
R8:Feuergefahr bei Berührung mit brennbaren Stoffen.
R21:Gesundheitsschädlich bei Berührung mit der Haut.
R25:Giftig beim Verschlucken.
R26:Sehr giftig beim Einatmen.
R34:Verursacht Verätzungen.
R42/43:Sensibilisierung durch Einatmen und Hautkontakt möglich.
R48/23:Giftig: Gefahr ernster Gesundheitsschäden bei längerer Exposition durch Einatmen.
R50/53:Sehr giftig für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
S-Sätze Betriebsanweisung:
S53:Exposition vermeiden - vor Gebrauch besondere Anweisungen einholen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S60:Dieses Produkt und sein Behälter sind als gefährlicher Abfall zu entsorgen.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
Chemische Eigenschaften
Orange-yellow powder. Soluble in acids
and hot water; insoluble in alcohol and ether.
Verwenden
Sodium Dichromate Dihydrate is used as a catalyst in the synthesis of Endoperoxide II. Strong oxidizing agent in organic synthesis. Used in metal finishing as an aid in corrosion resistance.
Definition
A red crystallinesolid, Na
2Cr
2O
7.2H
2O, solublein water and insoluble in ethanol. Itis usually known as the dihydrate(r.d. 2.52), which starts to lose waterabove 100°C; the compound decomposesabove 400°C. It is made bymelting chrome iron ore with limeand soda ash and acidification of thechromate thus formed. Sodiumdichromate is cheaper than the correspondingpotassium compound buthas the disadvantage of being hygroscopic.It is used as a mordant in dyeing,as an oxidizing agent in organicchemistry, and in analytical chemistry.
Allgemeine Beschreibung
Solid orange-yellow crystal or powder.
Air & Water Reaktionen
Water soluble (hot water).
Reaktivität anzeigen
Sodium dichromate dihydrate can react with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers). The products may themselves be capable of further reactions (such as combustion in the air). Reactions may be rapid but often requires initiation (heat, spark, catalyst, addition of a solvent). Can react violently with active metals, cyanides, esters, and thiocyanates.
Hazard
Toxic by ingestion and inhalation.
Health Hazard
INHALATION: Corrosive to mucous membranes continuous exposure may lead to perforation of nasal septum. EYES: Conjunctivitis and lacrimation. SKIN: Corrosive producing deep penetrating ulcers to exposed area. Slow to heal. INGESTION: Has a harsh metallic taste. May cause vertigo, thirst, abdominal pain, vomiting, shock, convulsions and coma.
mögliche Exposition
Used to make dyes, inks, pigments, and other chromates; in leather tanning, a corrosion inhibitor in circulating water systems; metal treatment; a drilling mud additive; chemical intermediate for chromium catalysts; colorimetry, oxidizing agent; bleaching agent; an algicide, fungicide, insecticide; in wood preservation.
Versand/Shipping
UN3087 Oxidizing solid, toxic, n.o.s., Hazard Class: 5.1; Labels: 5.1-Oxidizer, 6.1-Poisonous materials, Technical Name Required. UN3085 Oxidizing solid, corrosive, n.o.s., Hazard Class: 5.1; Labels: 5.1-Oxidizer, 8-Corrosive material, Technical Name Required.
läuterung methode
Crystallise the dichromate from small volumes of H2O by evaporation to crystallisation. Its solubility in H2O is 238% at 0o and 508% at boiling. The red dihydrate is slowly dehydrated by heating at 100o for long periods. It is deliquescent and is a powerful oxidising agent—do not place it in contact with skin— wash immediately as it is caustic. (Possible carcinogen.) Sodium dihydrogen orthophosphate ( 2 H2O) [13472-35-0 (2H2O), 10049-21-5 (H2O), 7558-80-7 (anhydrous)] M 156.0, m 60o(dec), d 4 1.91. Crystallise it from warm water (0.5mL/g) by chilling.
Inkompatibilitäten
Aqueous solution in a base. A strong oxidizer. Violent reaction with reducing agents; combustibles, strong acids; organic materials.
Natriumdichromat Dihydrat Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
Hydrogen[4-[[4-(diethylamino)-o-tolyl][4-[ethyl(3-sulfonatobenzyl)amino]phenyl]methylen]cyclohexa-2,5-dien-1-yliden](ethyl)(3-sulfonatobenzyl)ammonium, Natriumsalz
1-(2,6-Dimethylphenoxy)aceton
2,3,6-Trimethyl-p-benzochinon
Bleichromat
Dehydrocholsure
4-Aminonaphthalin-1,8-dicarboximid
Strontiumchromat
Hydrogen[4-[[4-(diethylamino)phenyl][4-[ethyl(3-sulfonatobenzyl)amino]phenyl]methylen]cyclohexa-2,5-dien-1-yliden](ethyl)(3-sulfonatobenzyl)ammonium, Natriumsalz
Natrium-1,2,3,6-tetrahydro-2,6-dioxopyrimidin-4-carboxylat
Methylenblau (C.I. 52015)
Hydrogen[4-[[4-(diethylamino)phenyl][4-[ethyl[(3-sulfonatobenzyl)amino]-o-tolyl]methylen]-3-methylcyclohexa-2,5-dien-1-yliden](ethyl)(3-sulfonatobenzyl)ammonium, Natriumsalz
ferric chomium lignin sulfonate
Pirenoxin
Chromic chloride hexahydrate
1,2,4-Trimethoxybenzol
ChroMiuM(III) sulfate hydrate
Menadion
Pale chrome yellow
Lemon chrome yellow 501
(2,6-DIMETHYLPHENOXY)ACETOXIME
water-proofing agnet AC
sulfomethylated gallnuat sodium tannic acid
9,10-Phenanthrenchinon
Acenaphthenchinon
Methyl 4-aminopyridine-3-carboxylate
9-Oxofluoren-2-carbonsure
Chromhydroxidsulfat
103 chrome yellow
Sodium chromate tetrahydrate
Kalium-1,2,3,6-tetrahydro-2,6-dioxopyrimidin-4-carboxylat
Lithiumdichromat
Natriumchromat
4,5-Dichloronaphthalene-1,8-dicarboxylic anhydride
4-Nitro-1,8-Naphthalenedicarboxylic Acid
Basic chromic sulfate
Bleisulfochromatgelb
4-((Dipropylamino)sulfonyl)-benzoesäure
acidizig fluid gelling agent CT^{1～6^}
Fast Green FCF
Ammoniumdichromat
