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[The ratio of calcium carbonate/organic matrix in the valves of Mytilus galloprovincialis as an indication of marine pollution].

The CaCO3/organic matrix ratio, in the valves of Mytilus galloprovincialis, decreases when increases the degree of marine biological pollution. Its periodic measurement in the shells of Mollusca grown in the same area is, therefore, very useful for the analytical control of the sea environment. The method here proposed is very simple as CaCO3 amount is measured by weighting the valves ashes at 600 degrees C while organic matrix amount is calculated by difference between the weight of dry sample and that of its ashes.