In view of the future development of the applications of nuclear energy and the possibility ofsea contamination, it was thought worth while to carry out a systematic study ofthe sorption of the radioelements by marine organisms.In the present work the sorption and the concentration factors of BOSr and 137Cs in Mytilus galloprovincialis are studied Examining the WSr data, it is verified that the equilibrium is maintained after 120 hr, and the concentration factor is 3.6 based on fresh weight (after centrifugation) and 98.3 based on ash weight.In the case of lS7Cs the equilibrium is reached after about 100 hr and the concentration factor, if based on fresh weight (at llO"C), varies from 4.3 for adult organisms to 6.4 for young organism; whereas, if based on ash weight, it varies from 117 for adult organisms to 175 for young organisms.RBsuxnB-En raison des futurs dkveloppements des applications de l'tnergie nucltaire et de la possibilitk de contamination de la mer, on a pensk qu'il serait utile d'ktudier systkmatiquement l'absorption des radiotlkments par les organismes marins. Cet article ttudie l'absorption et les facteurs de concentration du 90Sr et du 137Cs dans le Mytilus galloprovincialis.En ce qui concerne le BOSr on a obtenu l'tquilibre au bout de 120 hr et on a vtrifit que le facteur de concentration est de 3,6 quand il est calculk i partir du poi& de l'tchantillon frais (aprts la centrifugation) et de 98,3 quand il est calcult B partir du poids des cendres. En cce qui concerne le 13'Cs l'tquilibre est atteint au bout de 100 hr environ. Le facteur de concentration bask sur le poids de l'tchantillon frais ( B llO"C), varie de 4,3 pour organismes adultes et 6,4 pour organismes jeunes tandis que le mCme facteur bast sur le poids des cendres varie de 1 17 pour organismes adultes a 175 pour les organismes jeunes.

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A study was made of the influence of surfactants in the treatment of contamined waters, both in the flocculation and in the ion flotation processes. Data are given on the effect ofvarying of the pH and theelectrostatic charge ofsuspended particles. Some flocculation value and volume reduction factors are given for various cationic and anionic detergents. A relationship was found between pH, intrinsic viscosity and efficiency of decontamination for 13'Cs in the ion flotation method.

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