This salt is naturally present in coastal areas because of the seawater and NaCl may be found suspended in the fog and sea spray.ĭecay mechanisms of natrite Solubility behavior Deicing salts may contain sodium chloride, which is very soluble. Further sources are ground and surface water which may contain Na +-ions. A large number of cleaning materials and, in particular, previously used conservation products (such as waterglass) contain sodium ions that remain in the building materials. If, for example, a Portland cement only contains 0.1% Na 2O then 0.45kg of sodium carbonate can be formed per100kg of cement Title: Monitoring Wall Paintings Affected by soluble Salts It can be calculated that 1g of Na 2O can lead to the formation of 4.6g of sodium carbonate decahydrate. Sodium carbonate can crystallize within the porous building materials when soluble sodium compounds in an alkaline environment, as explained below, react with the CO 2 from the air leading to its eventual efflorescence.Ĭements containing up to 0.5% soluble alkalis (in accordance with DIN standards) have a high content of sodium ions. Information on the origins and formation of natrite on monuments Different extraction techniques have been developed to produce pure sodium carbonate through dissolution, purification and evaporation processes. Varying amounts of natural sodium carbonate can also be found in alkaline springs. Hydrated sodium carbonates occur naturally in solid salt deposits, in salt lakes, e.g., Lake Magadi in East Africa or Owens Lake in California, U.S.A. 6 Through the Scanning Electron Microscope.2 Information on the origins and formation of natrite on monuments.
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