Biogenic phosphorus in oligotrophic mountain lake sediments: differences in composition measured with NMR spectroscopy.
Phosphorus (P) composition in alkaline sediment extracts from three Swedish oligotrophic mountain lakes was investigated using 31P-NMR spectroscopy. Surface sediments from one natural lake and two mature reservoirs, one of which has received nutrient additions over the last 3 years, were compared with respect to biogenic P composition. The results show significant differences in the occurrence of labile and biogenic P species in the sediments of the different systems. The P compound groups that varied most between these three systems were pyrophosphate and polyphosphates, compound groups known to play an important role in sediment P recycling. The content of these compound groups was lowest in the reservoirs and may indicate a coupling between anthropogenic disturbances (i.e., impoundment) to a water system and the availability of labile P species in the sediment. A statistical study was also conducted to determine the accuracy and reliability of using 31P-NMR spectroscopy for quantification of sediment P forms.
Ahlgren
Joakim
J
Department of Physical and Analytical Chemistry, Uppsala University, Box 599, 751 24 Uppsala, Sweden. joakim.ahlgren@kemi.uu.se
Reitzel
Kasper
K
Danielsson
Rolf
R
Gogoll
Adolf
A
Rydin
Emil
E
D005308:Fertilizers; D005618:Fresh Water; D019015:Geologic Sediments / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D010758:Phosphorus / Q000032:analysis*; D017553:Phosphorus Compounds / Q000032:analysis*; D013548:Sweden; D014874:Water Pollutants, Chemical / Q000032:analysis*
D005308:Fertilizers; D017553:Phosphorus Compounds; D014874:Water Pollutants, Chemical; D010758:Phosphorus