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- W2086874549 abstract "Diffusion characteristics of nitrate through calcium-alginate gel beads were studied and compared to diffusion of glycerol, a non-charged small molecule. Compared to the theoretical effective nitrate diffusion coefficients in gel beads of different alginate concentrations, calculated by the Mackie and Meares approach, experimental nitrate diffusion through alginate of different characteristics showed significant differences. When the residence time of gel beads in calcium chloride solution was increased from 10 to 60 min, 30% more nitrate diffused from outside to inside the polymeric matrix. When alginate concentration was varied from 3 to 6%, 25% less nitrate diffused from inside to outside alginate gel beads. In addition, experimental diffusion of a non-charged heavier molecule (glycerol) occurred faster than the one for nitrate. Significantly minor diffusion (some 30%) through alginate gel beads was found for a positive ion, ammonium. In this paper such differences mentioned above are discussed to be due to the possible electrostatic interactions between the negative charge of nitrate and calcium clusters around the polymer surface. These results could have significance in the field of inorganic nitrogen bioelimination using immobilized photosynthetic cells." @default.
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- W2086874549 date "2002-05-01" @default.
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- W2086874549 title "Diffusion characteristics of nitrate and glycerol in alginate" @default.
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- W2086874549 doi "https://doi.org/10.1016/s0927-7765(01)00287-9" @default.
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