title: Phosphorus fractionation in lake sediments--lakes Volvi and Koronia, N. Greece.
abstract: Sediments from two lakes, the meso-to-eutrophic Volvi and the hypertrophic Koronia, located in N. Greece were examined on the basis of P-fractionation. In both lakes, the rank order of P-fractions was HCl-P > NaOH-P > BD-P > NH4Cl-P. The loosely sorbed phosphorus (NH4Cl-P) represented < 1% of the sedimentary inorganic phosphorus, while the reductant phosphorus (BD-P) ranged 5-6%. The calcium bound phosphorus (HCl-P) showed considerable contribution (59-74%) to the sedimentary inorganic P-loads. The metal oxide bound phosphorus (NaOH-P) was higher in the hypertrophic (30-35%) than in the meso-to-eutrophic system (19-28%). Fine-sized sediments exhibited significantly higher concentrations of HCl-P in Volvi and NH4Cl-P in Koronia. Sampling month had significant effect in variance of most P-fractions and other sediment features in both lakes. Use was also made of multivariate statistics to identify the factors which influence the sedimentary phosphorus. NaOH-P was the most reactive fraction in Lake Volvi. Iron compounds and organic matter seem to play a significant role in regulating this labile P-budget. NH4Cl-P was the more reactive fraction in Lake Koronia which was influenced by sedimentation of P-absorbed on clay/silt fine particles.
authors.affiliation: Environmental Pollution Control Laboratory, Chemistry Department, Aristotle University, Thessaloniki, Greece.
authors.forename: A
authors.initials: A
authors.lastname: Kaiserli
authors.forename: D
authors.initials: D
authors.lastname: Voutsa
authors.forename: C
authors.initials: C
authors.lastname: Samara
mesh_terms: D002118:Calcium / Q000737:chemistry; D004784:Environmental Monitoring; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry*; D006115:Greece; D058085:Iron Compounds / Q000737:chemistry; D010316:Particle Size; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry*
chemical_list: D058085:Iron Compounds; D010758:Phosphorus; D002118:Calcium