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Phosphorus and calcium carbonate solubilities in Lake Kinneret
Author(s) -
Avnimelech Yoram
Publication year - 1983
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1983.28.4.0640
Subject(s) - solubility equilibrium , calcium carbonate , solubility , carbonate , calcium , chemistry , phosphoric acid , phosphate , phosphorus , inorganic chemistry , mineralogy , environmental chemistry , organic chemistry
Phosphate and calcium carbonate solubilities were calculated from data obtained for near‐bottom water samples from Lake Kinneret during the years 1975–1977. A potential diagram technique was used to determine which solid phase is in equilibrium with the solution. Both phosphorus and calcium carbonate solubilities are controlled, during the January–August period, through equilibrium with calcium‐carbonate‐phosphate, Ca 3 (HCO 3 ) 3 PO 4 . The calcium carbonate ionic product changes, depending on the phosphoric acid potential, during this period. The solubility product, (Ca 2+ ) 3 ×(HCO 3 − ) 3 ×(PO 4 3− ) is 10 −28.5 . Calcium carbonate activity is constant (10 −8.56 ) during the last months of the stratified period (September–December). These findings support the hypothesis that the first and most reactive product of the reactions occurring between CaCO 3 and phosphorus is a CaCO 3 H 3 PO 4 surface complex.