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- W2026465107 abstract "Exchange kinetics of phosphorus between sediments and water was studied using radioisotope 32p inorganic phosphates. The sediments were collected at Lake Kasumigaura, Japan. After adsorption-desorption equilibrium was attained in the sediments-water batch system, the radioisotope was added and the radioactivity was measured with time. The adsorption—desorption reaction was composed of an exchange reaction and a slow reaction. The exchange reaction has two phases—a very rapid reaction and a Langmuir type reaction. The very rapid exchange rates were calculated by measuring decreases in 32p activity during 0.5 min at different pH values. The adsorption rate constants of the very rapid exchange ranged from 24.3 to 63.8 (h−1). The values were much higher than those of the Langmuir type exchange after 0.5 min. The forms of exchangeable phosphorus in sediments were investigated by a phosphorus fractionation method. More than 80% of the exchangeable phosphorus in sediments appeared in NH4F-P(Al-P) and NaOH-o-P(Fe-P) fractions at pH 7. Adsorbed phosphorus by addition of phosphate was recovered in the above mentioned phosphorus forms. Most of the recovered phosphorus was exchangeable with dissolved phosphate in solution after 24 h of adsorption. However there was a difference in relative exchangeability between phosphorus in these fractions. The NH4F-P has a higher relative exchangeability than NaOH-o-P and part of adsorbed phosphorus as NaOH-o-P was converted from exchangeable-P into inactive-P." @default.
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- W2026465107 date "1989-06-01" @default.
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- W2026465107 title "Phosphorus exchange kinetics and exchangeable phosphorus forms in sediments" @default.
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- W2026465107 doi "https://doi.org/10.1016/0043-1354(89)90200-5" @default.
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