Biogeochemical cycle of arsenic and calculating the enrichment factor by using Li element.

In this study, the biogeochemical cycle of arsenic in the Bosporus and the Golden Horn, which have a two-layer stratified structure, was investigated and the dominant feature in this cycle was observed to be the anthropogenic (domestic + industrial) activities. On the contrary, in the rural areas which are far from human activities, such as Iğneada, the seawater-atmosphere interchange can be observed evidently in the periods covering the primary production.