Ammonium Persulphate

Synonyms: ammonium peroxodisulfate, ammonium peroxydisulfate, AP, APS, ammonium persulphate

CAS Number: 7727-54-0,

Molecular Weight: 228.2,

Chemical Formula: (NH4)2S2O8

EINECS EC Number: --

FEMA: ----

Ammonium persulphate (NH4)2S2O8 is a strong oxidizing agent. It is very soluble in cold water, a large fall of temperature accompanying solution. It is a radical initiator. It is used to etch copper on printed circuit boards as an alternative to ferric chloride solution. It is also used along with tetramethylethylenediamine to catalyze the polymerization of acrylamide in making a polyacrylamide gel.

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.

It is also used in Oil well fracking or fracturing.

Specifications of Ammonium Persulfate:

Properties --------------------- Commercial ----------- Pure
Assay of [((NH4)2S2O8)]--------- 98.5 min ------------- 99.0 min
Active oxygen ------------------ 6.91 min ------------- 6.94 min
Chloride and chlorate (as Cl) -- 0.002 max ------------ 0.001 max
Iron (Fe) ---------------------- 0.0015 max ----------- 0.001 max
Heavy metals (as Pb) ----------- 0.001 max ------------ 0.001 max
Magnesium (Mn)------------------ 0.0002 max ----------- 0.00002 max
Moisture ----------------------- 0.15 max ------------- 0.05 max
pH ----------------------------- 3-5 ------------------ 3-5
Mesh Size ---------------------- May be specified by the buyer ----

Ammonium Persulfate or Ammonium Persulphate crystals are used as an alternative to the traditional ferric chloride to produce a cleaner copper etchant solution.

Ammonium Persulphate is designated as Electrophoresis grade and suitable as a catalyst in acrylamide polymerization. Ammonium persulfate is a widely used reagent in biochemistry and molecular biology for the preparation of polyacrylamide gels. APS forms oxygen free radicals in aqueous solution by a base-catalyzed mechanism. The bases, are most commonly used as catalysts, are tertiary amines such as N,N,N',N'-tetramethylethylenediamine (TEMED) or 3-dimethylaminopropionitrile (DMAPN). The free radicals will cause the polymerization of acrylamide and bis-acrylamide to form a gel matrix, which can be used for separating macromolecules by size Protocols for the use of APS to prepare polyacrylamide gels for electrophoresis are widely available. APS has also been utilized to study protein-protein interactions via photo initiated cross linking chemistry. Other applications of APS include its use as a reducer and retarder in photography, the manufacture of aniline dyes, electroplating, the decolorizing and deodorizing of oils. A protocol on the APS-mediated modification of polypropylene membranes with polyaniline has been published. APS has been used to prepare biodegradable macro porous hydro gels for application as crosslink able biomaterials.

ACS Analytical Reagent Grade

Ammonium persulfate

Formula Weight: 228.19
CAS # 7727-54-0


Form: Off-white crystalline powder
Assay:  not less than 98.0%
Residue on Ignition: not less than 0.05%
Insoluble Matter: not less than 0.005%
Titratable Free Acid: not less than 0.04 meq/gm
Chloride and Chlorate (Cl): not less than 0.001%
Heavy Metals (Pb): not less than 0.005%
Iron (Fe): not less than 0.001%
Manganese (Mn): not less than 0.5 ppm