Abstract
The concentration of total organic carbon in unpolluted stream water may be estimated from measurement of absorbance at 250 nm. However, unless allowance is made for the change in the composition of this organic matter under diverse flow conditions, the estimation is subject to serious systematic errors, particularly at low carbon concentrations. Grouping data according to flow at time of sampling leads to a considerable improvement in the accuracy of the estimation, but requires the use of three regression equations. The resulting procedure is then, however, valid under a wide range of flow conditions.
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