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  Slightly yellow, transparent liquid.  
  Sodium Bisulphite Solution is a convenient source of sulphur dioxide often used as an alternative to the powder (crystalline Sodium Sulphite / Sodium Metabisulphite). It is used as a reducing agent in  a variety of applications, for example:  
  in effluent treatment particularly that containing chromium  
  as an antichlor in the textile and other industries  
  as an oxygen scavenger in boiler water treatment and in oil exploration/extraction  
  as a chemical substance in the manufacture of some dyestuffs, e.g. indigo and in the manufacture of pharmaceutical  
  Physico-chemical properties  
  Chemical formula  NaHSO3  
  Mol Wt. 104.07 g/mol  
  Density in temp.20C 1.3-1.4 g/cm3  
  Sodium Bisulphite decomposes with liberation of sulphur dioxide.  
  Technical Specification  
  NaHSO3 min. 36%  
  Sodium sulphite (Na2SO3) max.  2%  
  Sodium sulphate (Na2SO4) max. 2,5%  
  Iron (Fe) max. 10 mg/kg  
  Heavy metals (as Pb) max. 10 mg/kg  
  Arsenic (As) max. 0,5 mg/kg  
  Lead (Pb) max. 0,5 mg/kg  
  Selenium (Se) max.   1 mg/kg  
  Cadmium (Cd) max. 0,1 mg/kg  
  Mercury (Hg) max. 0,03 mg/kg  
  Zinc (Zn) max    1 mg/kg  
  pH min. 4  
  Analysis made by ZN-„POLCHEM” Sp. z o.o.-001:2002  
  It should be stored in acid resistant steel cisterns or in carbon steel cisterns with rubber lining or in polyethylene containers.  
  Sodium bisulphite is supplied in rail cisterns or tank trucks.  
  RID classification – Class 8/17 c; ADR classification – Class 8/17 c.  
  Handling Precautions    
  Wear eye protection and rubber gloves, particularly when handling bulk quantities. Do not store near to, or allow to come into contact with acids or oxidizing agents.   
  Sodium bisulphite solution is middly corrosive. It is not toxic substance and  non-flammable but will decompose in a fire with liberation of sulphur dioxide, a toxic gas.  
  Decomposition of sodium bisulphite solution gives sulphur dioxide. The maximum limit value for SO2 is 2 mg/m3. The odour sensibility threshold is about 0.8 mg/m3.  
  It is irritation to  eyes, nose, skin and respiratory tract. During inhalation causes: mucous membrane irritation, coughing, sultrines. After consumption causes: burning feeling in oesophagus and mouth.   
  First Aid – in case of poisoning SO2    
  Eyes: Wash out with water for  at least 15 minutes.  
  Mouth: Wash out with water and give water or milk to drink.  
  Skin: Wash off with planty of water.  
  Inhalation: Remove the person out of the danger area to fresh air, rest and keep warm until symptoms of distress subside.  
  Obtain  medical assistance, particularly if coughing persists.  
  In case of effluent: retard spillage with sand, soil. Dilute with water, slurry with soda ash or lime.