Natriumthiosulfat Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
FARBLOSE KRISTALLE
CHEMISCHE GEFAHREN
Zersetzung beim Erhitzen unter Bildung giftiger Rauche mit Schwefeloxiden. Reagiert heftig mit starken Oxidationsmitteln.
ARBEITSPLATZGRENZWERTE
TLV nicht festgelegt (ACGIH 2005).
MAK nicht festgelegt (DFG 2006).
INHALATIONSGEFAHREN
Eine belästigende Partikelkonzentration in der Luft kann schnell erreicht werden.
LECKAGE
Persönliche Schutzausrüstung: Atemschutzgerät, P1-Filter für inerte Partikel. Verschüttetes Material in Behältern sammeln.
R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S24/25:Berührung mit den Augen und der Haut vermeiden.
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
Chemische Eigenschaften
Sodium thiosulfate, Na2S203·5H20, also known as sodium hyposulfite, hypo,andsodium subsulfite, is a white crystalline solid that has a melting point of 48 °C(118 °F). Water soluble,it is used as a fixing agent for photographic films, plates, and papers. Sodium thiosulfate is used in medicine, as a germicide, in manufacturing leather, as a mordant in dyeing, and for extracting silver from ore.
Physikalische Eigenschaften
Anhydrous thiosulfate is a white powder; soluble in water; insoluble in ethanol.
Sodium pentahydrate is a colorless, odorless, crystalline solid; density 1.69 g/cm
3; decomposes around 50°C; effloresces in dry air above 33°C; very soluble in water and oil of turpentine; insoluble in ethanol.
Verwenden
Sodium thiosulfate is a common analytical reagent used in iodometric titration to analyze chlorine, bromine, and sulfide. Other uses are in bleaching paper pulp, bleaching straw, ivory, and bones, for removing chlorine from solutions, silver extraction from its ores, a mordant in dyeing and printing textiles, and as an antidote to cyanide poisoning.
Another major application is in photography, where it is used as a fixer to dissolve unchanged silver salts from exposed negatives.
Sodium Thiosulfate is used primarily as a medicament against cyanide poisoning, able to convert cyanide into thiocyanate, a reaction which is catalyzed by the enzyme Rhodanese. Antioxidant.
Definition
ChEBI: An inorganic sodium salt composed of sodium and thiosulfate ions in a 2:1 ratio.
synthetische
Sodium thiosulfate is a common reducing agent. It reduces iodine to iodide anion forming sodium tetrathionate. This reaction is utilized in the so-called iodometric titration: 2S
2O
32ˉ + I
2 → S
4O
62ˉ + 2Iˉ
Sodium thiosulfate reacts with chlorine to form sodium bisulfate and hydrochloric acid. This reaction removes chlorine from aqueous solutions:Na
2S
2O
3 + 4Cl
2 + 5H
2O → 2NaHSO
4 + 8HCl
Sodium thiosulfate reacts with hydrochloric acid, decomposing to sulfur and sulfur dioxide: Na
2S
2O
3 + 2HCl → 2NaCl + S + SO
2 + H
2O.
Allgemeine Beschreibung
Sodium thiosulfate (Na
2S
2O
3) can be obtained from Na
2S
2O
3.10H
2O by heating above 100 °C. It can be synthesized from sodium sulfate.
Hazard
Use in foods restricted to 0.1%.
Sicherheitsprofil
Moderately toxic by subcutaneous route. Incompatible with metal nitrates, sodium nitrite. When heated to decomposition it emits very toxic fumes of Na2O and SOx. See also SODIUM THIOSULFATE and SODIUM THIOSULFATE, PENTAHYDRATE.
läuterung methode
Crystallise it from EtOH/H2O solutions or from water (0.3mL/g) below 60o by cooling to 0o, and dry it at 35o over P2O5 under vacuum. [Foerster & Mommsen Chem Ber 57 258 1924.] This salt is used as a secondary standard in volumetric analysis [Kilpatrick J Am Chem Soc 45 2132 1923], and is used as “Hypo” in photography [Hargreaves & Dunningham J Soc Chem Ind 42 147T 1923.]
Natriumthiosulfat Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
4-[4-(BROMOMETHYL)PHENYL]-1,2,3-THIADIAZOLE
3-FLUORO-2-IODOPYRIDINE-4-CARBOXYLIC ACID
4-Fluorthiophenol
S-METHYL-S-(4-METHOXYPHENYL) SULFOXIMINE
Iodcyclohexan
S-METHYL-S-(5-METHYLFURAN-2-YL) SULFOXIMINE
S-METHYL-S-(4-HYDROXYPHENYL) SULFOXIMINE
2,5-Dibromo-3-nitropyridine
Insecticide double agent
Tricyclo[3.3.1.13,7]decan-1-ol
4-(CHLOROSULFONYL)-7-FLUORO-2,1,3-BENZOXADIAZOLE
S-METHYL-S-(2-THIAZYL) SULFOXIMINE
S-METHYL-S-(2-FLUOROYPHENYL) SULFOXIMINE
S-METHYL-S-(4-CHLOROPHENYL) SULFOXIMINE
1-(3-AMINO-2-CHLORO-PYRIDIN-4-YL)-ETHANONE
4-(N,N-DIMETHYLAMINOSULFONYL)-7-FLUORO-2,1,3-BENZOXADIAZOLE
(4-CHLORO-PHENYL)-METHANESULFONYL CHLORIDE
1-TERT-BUTYL-3-(TRIFLUOROMETHYL)-1H-PYRAZOLE-4-CARBOXYLIC ACID
4-Bromo-2-fluorobenzonitrile
2-Bromo-4-pyridinecarboxaldehyde
Cartap
3,5-DIBROMO-2-HYDROXY-4-METHOXYBENZALDEHYDE
S-METHYL-S-(3-ACETAMIDOPHENYL) SULFOXIMINE
Dimethylbrommalonat
4-FLUORO-2,1,3-BENZOXADIAZOLE
3-Bromo-1-benzothiophene
1,3-Dibrompropan-2-ol
3-NITROPHENYLMETHANESULFONYL CHLORIDE
S-METHYL-S-(4-METHYLPHENYL) SULFOXIMINE
S-ETHYL-S-PHENYL SULFOXIMINE
2-Chlor-1-iod-4-nitrobenzol
1-Iodnaphthalin
4-(HYDROXYMETHYL)PICOLINITRILE
S-Allylacrylo-1-sulfinothioat
4-BROMO-1-METHYL-3-(TRIFLUOROMETHYL)-1H-PYRAZOLE
1-TERT-BUTYL-4-BROMO-3-(TRIFLUOROMETHYL)-1H-PYRAZOLE
Tribrommethan
3-Iodpyridin
1-(3-AMINO-PYRIDIN-4-YL)-ETHANONE
S-METHYL-S-(4-FLUOROPHENYL) SULFOXIMINE
