Sodium persulfate

Reported in EPA TSCA Inventory.

ACGIH TLV: TWA 0.1 mg/m³
DOT Classification:  5.1; Label: Oxidizer

1. Introduction of Sodium persulfate
Sodium persulfate is also called Peroxydisulfuric acid, disodium salt ; Sodium peroxydisulfate ; EINECS 231-892-1 ; Persulfate de sodium ; Persulfate de sodium [French] ; Disodium peroxodisulphate ; Peroxydisulfuric acid (((HO)S(O)2)2O2), disodium salt ; Peroxydisulfuric acid (((HO)S(O)₂)₂O₂), sodium salt (1:2) ; Peroxydisulfuric acid, disodium salt ; Sodium persulfate [UN1505]. The IUPAC Name of it is Disodium sulfonatooxy sulfate.

2. Properties of Sodium persulfate
Classification Code: TWA 0.1 mg/m³
Melting point: 100 °C 
H bond acceptors: 8
H bond donors: 2
Freely Rotating Bonds: 3
Polar Surface Area: 143.96 Å² 
Density: 2,4 g/cm3
Solubility: H2O: 1 M at 20 °C, clear, colorless
Water Solubility: 550 g/L (20 ºC)
Merck: 14,8656
Stability: Stability Unstable. Strong oxidizer. Contact with combustible material may cause fire. Incompatible with combustible material, strong reducing agents, strong bases, alcohols, aluminium, magnesium. Protect from moisture.

3. Toxicity of Sodium persulfate

Hazard Codes Sodium persulfate (CAS NO.7775-27-1): O,Xn
Risk Statements: 8-22-42/43-36/37/38 
R8: Contact with combustible material may cause fire. 
R22: Harmful if swallowed. 
R42/43: May cause sensitization by inhalation and skin contact. 
R36/37/38: Irritating to eyes, respiratory system and skin.
Safety Statements: 22-45-36/37/39-26-17 
S22: Do not breathe dust. 
S45: In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37/39: Wear suitable protective clothing, gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S17: Keep away from combustible material.
RIDADR: UN 1505 5.1/PG 3
WGK Germany: 1
RTECS: SE0525000
HazardClass: 5.1
PackingGroup: III
Poison by intraperitoneal and intravenous routes. A powerful oxidizer; can cause fires. When heated to decomposition it emits toxic fumes of SO_x and Na₂O. See also SULFATES.

5. Use of  Sodium persulfate
Sodium persulfate can be used in medicine, bleaching, batteries, and chemical reagents: It can be used as a oxidizing agent in chemistry, for example in a synthesis of diapocynin from apocynin where iron(II) sulfate is the radical initiator. It is uesed as a bleach, both standalone (particularly in hair cosmetics) and as a detergent component. It is a replacement for ammonium persulfate in etching mixtures for ZINC and printed circuit boards, and is used for pickling of copper and some other metals. It is also a source of free radicals, making it useful as a radical initiator for emulsion polymerization reactions and for accelerated curing of low FORMALDEHYDE adhesives. It is also used as a soil conditioner and in manufacture of dyestuffs, modification of starch, bleach activator, desizing agent for oxidative desizing, etc.