The systematic investigation of heavy metal content in suspended matter is suitable for distinguishing point and non-point sources and for establishing trends of pollution if the dataset is analysed separately, considering the low and high average water discharge periods.

At the examined reach of the Danube (at 1669 km) Ag,Cd,Cr,Cu,Ni,Pb and Zn can be considered as constant and/or intermittent pollutants derived from a few point sources of pollution situated upstream. In the late eighties Ag,Cd,Cu,Pb and Zn concentration of suspended matter had been increased mainly in the range of low average water discharge (LWD), which provides evidence for an increase in emission.

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