Experimental data were collected which give direct evidence that 15 N‐labeled nitrate added to lake water can be converted to molecular nitrogen during anoxic periods. The rate of denitrification measured by the 15 N method agrees with the rate calculated from the disappearance of nitrate. The end product of denitrification in lakes appears to be N 2 . There was no evidence of N 2 O or NO production.
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Goering et al. (1966) studied this question.