The Preservation of Antiquities a Handbook for Curators
The Preservation of Antiquities a Handbook for Curators
Friedrich Rathgen
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>) >» »> " »> »> " ^ )> >> „ 4 „ „ 0-0 The steeping was, therefore, in reality complete after five days, and, as the steeping water was thoroughly mixed before the withdrawal of the 100 c. C, the total quantity of sodium chloride contained in the figure can be calculated as follows : For the 15th part (viz. 100 c. C. ) of the water 3-6 + 0-4, i. E. 4'0 CO. , of decinormal silver solution were used, which is equivalent to 15x4*0, i. E. 60 c. C, of silver solution for the wliole quantity. Now 1 c.... C. Of this decinormal solution cor- responds to 0*00584 gramme of sodium chloride ; the water therefore contained 60 x 0*00584 gr. , or 35 gr. Sodium chloride. Thus the figure contained altogether 1^^°/^ of sodium chloride. In addition to the chlorine compounds, there was also a considerable quantity of sulphates, the presence and dis- appearance of which were tested by adding to a few cubic centimetres of the water a dilute solution of barium nitrate or of barium chloride ^ The soluble barium salts give with sulphates a white precipitate or cloudiness of insoluble ^ In applying the above test it is advisable to add one or two drops of nitric acid before the addition of the barium salt.
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