New Zealand Journal of Marine and Freshwater Research abstracts
Measurement of oxygen production and demand in lake waters
N. M. BURNS
M. M. GIBBS
M. L. HICKMAN
National Institute for Water & Atmospheric
Research Ltd
P. O. Box 11-115
Hamilton, New Zealand
Abstract By use of a modern BOD bottle probe, a digital
read-out meter, and quadruplicate sampling, oxygen concentrations were
routinely measured with a precision of +/- 0.02 g DO m-3. This level
of accuracy permitted measurement of Water Oxygen Demand (WOD), Net Production
(NP), and Gross Production (GP) at all depths in the water column of lakes.
Sediment Oxygen Demand (SOD) was also measured and found to be small when
compared to the total water column oxygen demand in unstratified water but was
a significant part of the hypolimnetic oxygen uptake. Measurements of GP were
found to correlate closely with primary production values determined
independently by means of the 14C technique. Significant GP was also
found in the hypolimnion of a mesotrophic lake, indicating that WOD does not
always provide a measure of hypolimnetic oxygen uptake; net production does so
in this situation. Further, WOD was found to decrease by about 20% per day in
incubated samples, revealing that WOD incubations should never exceed one day
in duration.
Keywords water oxygen demand; water oxygen production,
sediment oxygen demand; measurement of oxygen concentration
New Zealand Journal of Marine and Freshwater Research, 1996: Vol. 30:
127-133
0028-8330/96/3001-0127 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (526K); (scanned from paper original: notes about this process)
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