Náttúrufræðingurinn - 1970, Síða 53

N ÁTTÚR U F RÆÐING U RI N N
195
Barnes, H. og A. li. Folkard 1951. The determination of nitrites. Analyst 76:
599-603.
Carpenter, ./. H. 1960. New measurements of oxygen solubility in pure and
natural water. Limnol. Oceanogr. 11:264-277.
Hutchinson, G. E. 1957. A treatise on Limnolog)'. Vol. I. Geography, Physics
and Chemistry. Jolin Wiley & Sons Inc. New York.
Lamby, Karljosef 1941: Zur Fischereibiologie des Mývatn, Nord Island. Zeit-
schrift f. Fischerei und Hilfswissenschaften, XXXIX, 5:749-805.
Mullin, J. B. og J. P. lliley 1955. The colorimetric determination of silicate
with special reference to sea and natural waters. Anal. Chirn. Acta 12:
162-176.
Mullin, J. B. og J. P. Riley 1955 a. The spectrophotometric determination of
nitrate in natural waters with particular reference to sea water. Anal.
Chim. Acta /2:464-480.
Murphy, J. og /. P. Riley 1962. Modified single solution method for the de-
termination of pliosphate in natural waters. Anal. Chint. Acta 27(l):31-36.
Ostenfeld, C. H. og Wesenberg-Lund 1906. A Regular Fortnightly Exploration
of the Plankton of two Icelandic Lakes, Thingvallavatn and Mývatn. Pro-
ceed. of the Roy. Soc. of Edinburgh, Session 1904—1905. XXV. Part 12:
1092-1167.
Poulsen, E. M. 1924. Islandske Ferskvandsentomostraker. Vidensk. Meddel. fra
Dansk naturhistorisk Forening i K0benhavn, 75:81-141.
Richards, F. A. og R. A. Kletch 1964. The spectrophotometric determination
of ammonia and labile amino compounds in fresh and seawater by
oxidation to nitrite. Ken Sugawara Festival Volume, 65-81. Maruzen Com-
pany Ltd. Tokyo.
Strickland, J. D. H. og T. R. Parsons 1968. A practical handhook of seawater
analysis. Fisheries Res. Board of Canada, Bull. No. 167. Ottawa.
S U M M A R Y
Chemical Observations in Lake Mývatn June 26—27, 1969
by
Unnsleinn Stefánsson,
Marine Research Institute, Reykjavík.
Mývatn is considered one of the most productive lakes in Iceland. Biological-
ly it is of enormous interest. The main sources of inflow are Grænilækur, a
river entering the southern part ol' the lake, and warm and cold springs drain-
ing into the eastern part. The outflow takes place at the westernmost part
through Geirastaðakvísl into the river Laxá.
In late June 1969 chemical observations were carricd out at 14 different