Abstract
Organic matter is ubiquitous in surface waters and its presence is generally recognized as being detrimental to water quality. Historically, biochemical oxygen demand (BOD) has been used to assess the effects, and indirectly the concentration, of organic matter in water. However, BOD measurements are not adequate for characterization of high quality natural waters. Measurement of organic carbon by combustion and infrared absorption is a promising technique for monitoring high quality water. This paper is the first part of a study of the distribution of organic carbon in Lake Superior Basin waters. Temporal and spatial distribution of organic carbon in open waters and in the vicinity of pollution inflows are described. Base line concentration levels have been established, and the use of organic carbon measurements as an overall indicator of water quality is discussed.
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