Ammonium persulfate (APS) is the inorganic compound with the formula (NH4)2S2O8. It is a colourless (white) salt that is highly soluble in water, much more so than the related potassium salt. It is a strong oxidizing agent that is used in polymer chemistry, as an etchant, and as a cleaning and bleaching agent.
The dissolution of the salt in water is endothermic.
Uses
As an oxidizer and a source of radicals, APS finds many commercial applications.
Salts of peroxydisulfate are mainly used as radical initiators in the polymerization of certain alkenes. Commercially important polymers prepared using persulfates include styrene-butadiene rubber and polytetrafluoroethylene.
The sulfate radical adds to the alkene to give a sulfate ester radical. It is also used along with tetramethylethylenediamine to catalyze the polymerization of acrylamide in making a polyacrylamide gel.
Illustrative of its powerful oxidizing properties, it is used to etch copper on printed circuit boards as an alternative to ferric chloride solution. This property was discovered many years ago. In 1908, John William Turrentine used a dilute ammonium persulfate solution to etch copper. Turrentine weighed copper spirals before placing the copper spirals into the ammonium persulfate solution for an hour. After an hour, the spirals were weighed again and the amount of copper dissolved by ammonium persulfate was recorded. This experiment was extended to other metals such as nickel, cadium, and iron, all of which yielded similar results.
Ammonium persulfate is the main component of Nochromix, a laboratory cleaning agent. On dissolving in sulfuric acid, it is used to clean laboratory glassware as a metal-free alternative to chromic acid baths. It is also a standard ingredient in western blot gels and hair bleach.
Persulfates are used as oxidants in organic chemistry
|
ITEMS |
|
|
Appearance |
white crystalline salt |
|
Assay |
98.5% w/w min |
|
Active oxygen |
6.9% w/w min |
|
Residue on ignition(as SO4) |
0.02% w/w max |
|
Chloride and chlorate(as CL) |
0.001% w/w max |
|
Manganese(Mn) |
0.00005% w/w max |
|
Iron(Fe) |
0.0005% w/w max |
|
Heavy metals(as Pb) |
0.0005% w/w max |
|
Moisture |
0.10% w/w max |
|
Decomposition of the product as supplied |
at above 60°C |
|
Recommended storage temperature |
Normal Temperature |
|
Storage stability as from date of delivery |
12 months
|
Since 1992, Hugestone Enterprise Co., Ltd. Has been dedicating itself as an active manufacturer and supplier of chemical products on an international scale. It owns four factories and holds shares in several joint-ventures, covering its products of Chemical Food Additives, Flavoring. Dehydrated Vegetables, Natural Color. We are strong in supplying various kinds of Ascids (Citric Acid, Malic Acid, Sorbitol Acid, Lactic Acid, Tartaric Acid, Amino Acid, etc. ), sweent agents (Aspartame, Acesulfame-K, Sucrlose, Stevioside ) and Gum (Agar Agar, Xanthan Gum)
