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Grain size distribution of suspended solids settleable solids and their relation to the reference elements iron and titanium its significance in the assessment of contaminants


, : Grain size distribution of suspended solids settleable solids and their relation to the reference elements iron and titanium its significance in the assessment of contaminants. Zeitschrift fuer Wasser- und Abwasser- Forschung 25(1): 46-52

Suspended solids play a role in the transport of numerous potential contaminants in flowing waters. For non-degradable or persistent compounds they may act as contaminant "sinks" after sedimentation. The sampling of suspended solids by the throughflow method, however, is problematic as it involves normally a fractionining according to grain sizes. At it is known that the specific load of anthropogenic substances is the highest in the so called fine-grain fraction < 20 .mu.m, such samples can a priorie be neither representative for the sampling site nor are they comparable with samples from other locations. Nevertheless, "reference elements" like iron and titanium still offer a possibility, namely after correlation or extrapolation of the measured values. The fundamentals of this method are explained at the example of numerous measuring stations at flowing waters in the old part of the Federal Republic of Germany.

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