Abstract
Abstract The impact of drilling oil activities using non-aqueous fluids (NAFs) was investigated with respect to Al, Fe, Mn, Ba, Co, Pb, Cu, As, Hg, Cr, Ni, Zn, Cd, V, aliphatic and polynuclear aromatic hydrocarbons concentrations in the sediment. As expected, Ba concentrations were remarkably increased relative to background levels, even 1 year after the drilling activities. High Ba concentrations were due to its massive content in the mud used for drilling. Minor increases of Mn and Fe levels were verified in reference sites (2500 m from the oil well), which were not accounted for by the drilling activities. Cd, Cr, Ni, As, Co, Cu, Pb, V and Zn concentrations were at the background levels. The Al, Ba, Cd, Cr, Cu, Ni and Zn mean concentrations were significantly different (P
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