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THE MAIN REGULARITIES OF CONCENTRATIONS CHANGES OF ORTHOPHOSPHATE IN EXPERIMENTS WITH ADDITIVES Fe2(SO4)3
Abstract
Iron precipitates mainly in the form of hydroxides and phosphates. The study of this process in field experiments using Fe2(SO4)3 additives is of great scientific and practical interest. Since phosphorus compounds are involved in the processes of eutrophication of water bodies. To study the patterns of changes in phosphate concentrations with the addition of iron (III) ion, absolute and relative concentrations of phosphorus and iron in the form of FePO4 were calculated. Then an experiment was performed to add the Fe3+ ion to natural water, selected in the lower reaches of the Don River. The authors placed water in glass aquariums with a capacity of 10 liters. Two experiments were conducted. In the first, the authors introduced iron ions in concentrations of 1.0 and 5.0 mg/l Fe3+ into aquariums. During the second experiment, the effect of four concentrations of Fe3+ ? 0.5, 1.0, 2.0, and 5.0 mg/l was studied. Water for analysis was taken from aquariums 3 or 4 hours after the introduction of metal salts, and then daily at the same time for 5 days. To study the patterns of changes in phosphate concentrations with the addition of iron (III) ion, absolute and relative concentrations of phosphorus and iron in the form of FePO4 were calculated. According to the results of two experiments, it was concluded that iron (III) ions significantly affect the change in the concentration of orthophosphates. It was found that with increasing concentration of iron (III) ions introduced into water, the concentration of phosphates in the solution decreases. The sharp decrease in the concentration of dissolved orthophosphates with the introduction of iron (III) ions is obviously due to the formation and precipitation of undissolved iron phosphates
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