The amount of dissolved organic material which is present in a lake may be used as an index of the amount of food available for growth of micro-organisms, and is therefore of importance in studying the biological productivity of any given body of water. The purpose of this investigation was to determine the amount and distribution of organic matter in the Okoboji Lakes. This was studied as a function of depth below the surface and also as a function of the particle size of the organic material, that is, whether the material could be considered as net plankton, nannoplankton, or as dissolved matter. For this investigation two general methods were used: (1) Determination of the amount of readily oxidizable organic material by means of the potassium permanganate method. Data of this type are usually referred to as the oxygen consumption of the material. (2) Determination of the amount of organic nitrogen present by means of a modified Kjeldahl method. For convenience these will be considered separately.
Proceedings of the Iowa Academy of Science
©1939 Iowa Academy of Science, Inc.
Adamson, A. Gray and Jahn, Theodore L.
"The Oxidizable Organic Matter and Organic Nitrogen Content of the Okoboji Lakes,"
Proceedings of the Iowa Academy of Science, 46(1), 407-411.
Available at: https://scholarworks.uni.edu/pias/vol46/iss1/123