| Summary: | Dissolution method for removal of sediment deposits covering the
underwater heritage ceramic surface has been studied. This research was
initiated by identification of chemical substances contained in sediment deposits
covering the ceramic using Spectrophotometer IR and X-Ray Diffractometer
(XRD). The concentration of metal in sediment deposits covering the underwater
heritage ceramic surface was determined by Atomic Absorption Spectroscopy
(AAS). The next step was dissolution of the sediment deposits by the sequential
steps using water solvent with variation of pH, continued by dissolution using
H2O2 solvent with variation of time, and the last step was dissolution using
Na2EDTA solution with time variation.
The results of sediment identification indicate that the chemical
substances composing the ceramic sediment deposits are organic compounds,
soluble salts in the forms of NaCl, Na2SO4, KCl and KNO3, and insoluble salts in
the forms of CaCO3, Ca3(PO4)2, MgSO4, MgCO3, Fe2(CO3)3 and Fe2O3. The
concentration of metal in sediment deposits covering the underwater heritage
ceramic are Na= 32,82 mg/g
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