Study of the chemical composition of some sea shells
1985
Prawat Depiwa
An atomic absorption spectrophotometric determination of magnesium in the sea shells and some marine organisms was done by grinding and digesting samples with concentrated hydrochloric acid. Standard magnesium solutions were prepared by pipetting an appropriate amount of magnesium standard into a volumetric flask and diluted with calcium carbonate solution. Magnesium concentrations were determined from a standard graph. The standard addition method was also used for the determination of magnesium in the samples. By this method, matrix effects could be eliminated. Thus the results of determination would be accurate and precise in reliability. The relative standard deviation and the percentage recovery of the method for determining magnesium were 2.13 percent and 96.75 percent respectively.The determination of the structure of carbonate mineral was done by infrared spectrophotometry. The difference in the site symmetry of the carbonate ion in aragonite and calcite created a difference in the vibrational spectra. The unique aragonite band at 1083 cm-1 was used to differentiate between aragonite and calcite
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