Ammoniumthiosulfat Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R33:Gefahr kumulativer Wirkungen.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-S?tze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S37:Geeignete Schutzhandschuhe tragen.
Chemische Eigenschaften
Ammonium thiosulfate is a white crystalline
solid with an ammonia odor.
Physikalische Eigenschaften
Colorless, monoclinic crystal; hygroscopic; decomposes on heating above 100°C; density 1.679 g/cm
3; very soluble in water (64 g/100 g at 20°C), insoluble in alcohol, and slightly soluble in acetone.
Verwenden
Ammonium thiosulfate finds application for leaching of gold and silver since it forms strong complexes. It is widely utilized as a photographic fixing agent, which acts quicklier than sodium thiosulfate fixers. It serves as a fertilizer. It acts as an additive to coal-waste mixtures to inhibit the formation of dangerous dioxins and furans. It is used as an analytical reagent in laboratories.
Allgemeine Beschreibung
AMMONIUM THIOSULFATE is a white crystalline solid. AMMONIUM THIOSULFATE is very soluble in water. The primary hazard is the threat posed to the environment. Immediate steps should be taken to limit its spread to the environment. AMMONIUM THIOSULFATE is used in photography, in chemical analysis, and for many other uses.
Air & Water Reaktionen
Hygroscopic. Very soluble in water.
Reaktivit?t anzeigen
AMMONIUM THIOSULFATE is sensitive to heat. AMMONIUM THIOSULFATE is incompatible with magnesium and aluminum powder. Mixtures with sodium chlorate can cause an exothermic reaction which can then decompose explosively. . Reacts with strong oxidizers such as chlorates, nitrates, and nitrites to release toxic ammonia, hydrogen sulfide, and sulfur trioxide gases. Will not polymerize. Ammonia, hydrogen sulfide, and oxides of nitrogen and oxides of sulfur may form in fires [USCG, 1999].
Health Hazard
Inhalation of dust may irritate respiratory system. Ingestion could be harmful. Contact with eyes or skin may cause irritation.
Brandgefahr
Special Hazards of Combustion Products: Toxic ammonia, hydrogen sulfide, and oxides of nitrogen and sulfur may form in fires.
Landwirtschaftliche Anwendung
Ammonium thiosulphate, [(NH
4)
2S
2O
3 or ATS] is a
crystalline salt, the aqueous solution of which is
commonly used as a liquid fertilizer. Crystalline
ammonium thiosulphate contains 19% nitrogen and 43 %
sulphur and its aqueous solution contains 12% nitrogen
and 26 % sulphur.
Ammonium thiosulphate is compatible with nitrogen
and nitrogen-potassium solutions, which are neutral or
slightly acidic (pH 5.8). It is also used as a suspension:
As it is non-corrosive, it can be stored in steel or
aluminumdrums.
Ammonium thiosulphate is prepared by the reaction
of sulphur dioxide and aqueous ammonia, followed by a
further reaction with elemental sulphur.
ATS can be applied directly to soils or as a foliar spray
through sprinkler irrigation systems. When applied to soils,
ATS decomposes into ammonium sulphate and colloidal
sulphur. The ammonium sulphate is available immediately
to plants, while the sulphur gets oxidized over a period of
time to sulphate ion (SO
42-) It is thus available to plants for
a longer time.
Ammonium thiosulphate also acts as a urease
inhibitor. When added to a urea-ammonium nitrate
solution, it inhibits urease activity for a month or so. In
industry, it is also used as a photographic fixing agent,
analytical reagent, fungicide and as a brightener in silverplating
baths.
Sicherheitsprofil
Moderately toxic by ingestion.When heated to decomposition it emits toxic vapors ofNH4
- and SOx.
m?gliche Exposition
Used as an agricultural chemical and
fungicide, metal lubricant; in cleaning metals; in photographic
chemicals, making other chemicals. A laboratory
reagent.
Versand/Shipping
UN3077 Environmentally hazardous substances,
solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous
material, Technical Name Required.
Inkompatibilit?ten
Contact with sodium chlorate may cause
a violent reaction. Corrodes brass, copper, and copperbased
metals.
Waste disposal
Incinerate. It may be possible
to dispose of waste material at a municipal facility if
treated, neutralized and oxidized.
Ammoniumthiosulfat Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
