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...adientssof concentration in the medium (Fetter 1999). Thestotal mass of the dissolved materials per unit of area,stransported per unit of time is described by the following equation:svF C D Cθ θ= − ∇s=-=(6)-=-sWhere v is mean velocity, C is molarity (M/L3) andsD is coefficient of diffusion (M2/T). By writing thesequation of mass conservation for a representativeselementary volume and considering the mass p...