Abstract
The use of DSDMAC (distearyl-dimethyl ammonium-chloride) in fabric rinse conditioners caused during the 1980s a noteworthy contamination of suspended solids in watercourses where concentrations of 200-400 mg/kg could be found. In the basin of the River Rhine this quantity amounted to 3.5 % of the total sales of this product. In this context the dissolved portion of DSDMAC can be neglected for its smallness. In 1990, the load on suspended solids had already decreased strongly, and this reduction had continued also in 1993/94. However detailed hydrological studies showed that the remaining loads are not constant but rise strongly with increasing river discharges. The origin of these additional loads from the drainage basin are subject of expert discussions. Further research is focussed on a substitution of DSDMAC by better degradable rinse conditioner actives.
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