Variations of Silver in the Sea Water around Monaco

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Silver determinations in the sea-water around Monaco were carried out using a procedure consisting of preconcentration of silver with lead sulfide, followed by dithizone extraction and spectrophotometric mono-colour measurement of silver-dithizonate.<BR>The average concentration of silver in the surface sea-water around Monaco was found to be 0.14%mu;g Ag/l. It was also concluded that observed variations of silver content in seawater were not related to the fresh water run-off from the neighbouring coast. This suggests that the variations have to be attributed to some other factor or a combination of factors.<BR>On the basis of the observed values of the silver content of the Var River water, an upper limit of silver supply by fresh waters into the sea-area around Monaco is estimated to be 2.3μg Ag per liter of fresh water. Considering the mixing of the fresh water with seawater, an increase of up to 0.09μg Ag/l in the sea-water might be expected. The fact that the increase of silver in the sea-water was not observed in connection with the fresh-water mixing suggests that some effective removal process of silver may be in operation at the immediate vicinity of the injection of fresh-water into the sea.
日本海洋学会の論文