X-ray microanalysis of the content of Na, K, Cl, Ca, P, S and Mg has been made in ultrasmall samples of haemolymph of the mussel Mytilus edulis living in habitats with lowered salinity. It was shown that the content of potassium in the haemolymph is higher than in the environment, both natural and artificial. Coefficient of potassium accumulation in relation to the environment increases with the decrease of external salinity.
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