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RECORD NUMBER: 275 OF 1579

OLS Field Name OLS Field Data
Main Title Dynamics of the Nitrogen Cycle in Lakes.
Author Alexande, Vera ;
CORP Author Alaska Univ., College. Inst. of Marine Science.
Year Published 1970
Report Number R71-7; EPA-WQO-16010-DDS; 00354,; 16010-DDS-03/70
Stock Number PB-203 791
Additional Subjects ( Nitrogen cycle ; Water chemistry) ; ( Nitrogen fixation ; Fresh water biology) ; ( Alaska ; Limnology) ; Lakes ; Algae ; Nitrogen isotopes ; Nitrates ; Ammonia ; Denitration ; Metabolism ; Sampling ; Labeled substances ; Seasonal variations ; Nutrients ; Water pollution ; Nitrogen 15 ; Subarctic regions ; Eutrification
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-203 791 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 220p
Abstract The importance of nitrogen fixation by blue-green algal populations was established, and nitrogen-15 was introduced for measuring in situ nitrogen fixation rates in natural waters. Nitrogen-15 techniques were developed for measuring nitrate and ammonia uptake, and the importanc3 of ammonia as a nitrogen source in lakes became apparent. Denitrification rates were measured accurately in anoxic lake waters. Rapid ammonia supply and turnover was demonstrated in lake waters. This implies that substantial nitrogen regeneration takes place constantly in surface waters of these lakes, and that this can provide a major nutrient source for the photosynthetic population. Such ammonia supply is independent of any sediment interaction. The limnological information available for interior Alaska has been expanded through the work. The Dumas method using a Coleman nitrogen analyzer were introduced for preparing nitrogen samples for mass spectrometry. (Author)
NTIS Title Notes Final rept..
PUB Date Free Form Mar 70,
Category Codes 8H; 6A; 64H; 57B
NTIS Prices PC A10 MF A01
Document Type NT
Cataloging Source NTIS/MT
Control Number 326522375
Origin NTIS
Type CAT