Ammonium peroxydisulfate

Ammonium persulfate
CAS number 7727-54-0 YesY
ChemSpider 56400 YesY
UNII 22QF6L357F YesY
EC number 231-786-5
UN number 1444
RTECS number SE0350000
Jmol-3D images Image 2
Molecular formula (NH4)2S2O8
Molar mass 228.18 g/mol
Appearance white to yellowish crystals
Density 1.98 g/cm3
Melting point

120 °C (393 K) decomp.

Solubility in water 80 g/100 ml (25 °C)
MSDS External MSDS
EU Index 016-060-00-6
EU classification Oxidant (O)
Harmful (Xn)
Irritant (Xi)
R-phrases R8, R22, R36/37/38, R42/43
S-phrases (S2), S22, S24, S26, S37
NFPA 704
LD50 689 mg/kg, oral (rat)
Related compounds
Other anions Ammonium thiosulfate
Ammonium sulfite
Ammonium sulfate
Other cations Sodium persulfate
Potassium persulfate
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Ammonium persulfate (APS) (NH4)2S2O8 is a strong oxidizing agent. It is very soluble in water; the dissolution of the salt in water is endothermic. It is a radical initiator. It is used to etch copper on printed circuit boards as an alternative to ferric chloride solution.[1] It is also used along with tetramethylethylenediamine to catalyze the polymerization of acrylamide in making a polyacrylamide gel.

Ammonium persulfate was prepared by H. Marshall by the method used for the preparation of potassium persulfate — by the electrolysis of a solution of ammonium sulfate and sulfuric acid.[2]

Ammonium persulfate is the main component of Nochromix. On dissolving in sulfuric acid, it is used to clean laboratory glassware as a metal-free alternative to chromic acid baths.[3] It is also a standard ingredient in western blot gels and hair bleach.


Airborne dust may be irritating to eye, nose, throat, lung and skin upon contact. Exposure to high levels of dust may cause difficulty in breathing.[4]


For a review of its uses in organic chemistry see Encyclopedia of Reagents for Organic Synthesis, vol. 1, pp. 193–197(1995).

External links

  • International Chemical Safety Card 0632
  • [2]
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