“…Environmental impact of produced water has been assessed by measuring chemical composition of freshly discharged produced water (Tibbets et al, 1992;Jacobs et al, 1992;Flynn et al, 1992), by plume dispersion-transport models Smith, 1995: Brandsma et al, 1995;Washburn, et al, 1999) and by ecotoxicological measurements (Brendehaug et al, 1992;Neff and Sauer, 1995). Because of high variability in its chemical composition, toxicity of produced water shows a wide range of results (summarized by Patin, 1999).…”