Sodium Sulfite
Basic information:
CAS No.7757-83-7
Chemical formula:Na2SO3
Molecular weight:126.04
Character:colourless、monoclinic crystal or powder
Density:2.633
Melting point:150℃(decomposition of water loss)
Solubleness(mg/ml):23g/100mL (20℃),soluble in water,insoluble in ethanol,etc.
Techical Index(Mass fraction/%)
|
Items |
Index |
||
|
High pure grade |
Refined class |
Photographic grade |
|
|
Na2SO3 ≥% |
98 |
98 |
97 |
|
Iron(Fe) ≤% |
0.0005 |
0.002 |
0.005 |
|
Water insoluble ≤ % |
0.005 |
0.01 |
0.05 |
|
Free alkali ≤ % |
0.1 |
0.3 |
0.15 |
|
Sodium sulfate≤ % |
1.5 |
1.5 |
— |
|
Sodium Chloride ≤ % |
0.005 |
0.02 |
— |
|
Heavy metal(Calculated as Pb≤ % |
0.001 |
0.002 |
0.002 |
|
Arsenic(As) ≤% |
0.0001 |
0.0005 |
— |
|
Sodium Thissulfate ≤% |
0.01 |
0.02 |
0.03 |
|
Aqueous apperance |
qualified |
qualified |
qualified |
|
Silver and ammonia nitrate solution |
— |
— |
qualifed |
Uses:
1.Used for trace analysis and determination of tellurium and niobium,preparation Of developer and as reducing agent;
2.Used as stabilizer for aritificial fiber,bleaching agent for fabric,photographic Developer,bleaching deoxidizer,perfume and dye reducing agent,paper lignin Remover,etc.
3.Used as common analytical reagent and photoresistive material;
4.Reducing bleach has bleaching effect on food and strong inhibiting effect on Oxidase in plant food.
5.Printing and dyeing industry as deoxidizer and bleaching agent,used in various Kinds of cotton fabric cooking,can prevent cotton fiber from local oxidation And affect the fiber strength,and improve the whiteness of cooking.
6.Used in food industry as bleaching agent,preservative,osteoporosis agent and Antioxidant. It is also used in pharmaceutical synthesis and as reducing agent In the production of dehydrated vegetables.
7.Used for making cellulose sulfite ester,sodium thiosulfate,organic chemicals,Bleached fabrics,etc.,also used as reducing agent,preservative,chlorine remover,etc.
Package/Capacity of container/Storage:
Packing:in 0Cr18Ni9 drums or 25kg bags within plastic.
Store in a cool,ventilated,dry warehouse.