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Ce phénomène de bio-accumulation est bien connu grâce à certaines espèces capables d'accumuler des doses de substances naturelles plusieurs milliers de fois au delà de la concentration que l'on rencontre dans le sol.
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The has bio-accumulation is the sum of absorptions of a pollutant per direct and food way by watery species. This phenomen on of bio-accumulation is well-known thanks to certain species able to accumulate amounts of natural substances several thousands of times beyond the concentration which one meets in the ground. Thus, the algae of the wrack types or Laminaria are able to accumulate bromine and iodine present in the water of the seas what is made profitable in the industrial extraction of these products Plutor ejected by the man in the oceans coming from the treat ment plants of the radioactive waste can be concentrated up to 3000 times by the phytoplankton and 1200 times by the benthic algae. This phenomen on has as a consequence a transfer and a biological increase in pollution inside the contaminated biocénoses. Each trophic chain will be the site of a process of increase in concentration in the persistent pollutants in the biomass as one goes up in the various levels of the ecological pyramid.
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