During the storage of water samples collected from the sea, rivers or lakes, increased bacterial activity causes changes in the organic, oxygen, carbon dioxide, ammonia, nitrate or phosphate content or the H-ion concentration of the water (Waksman and Carey, 1935 ; ZoBell and Anderson, 1936)....
Zobell, Claude E., and Barbara F. Brown. 1944. "Studies on the chemical preservation of water samples." Journal of Marine Research 5, (3). https://elischolar.library.yale.edu/journal_of_marine_research/615