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Table 2 Element concentrations (μg/l) in water at two different sites along the Danube River in Bulgaria [16]

From: Seasonal profile of metal accumulation in the acanthocephalan Pomphorhynchus laevis: a valuable tool to study infection dynamics and implications for metal monitoring

Element Novo Selo (km 845 ) Iskar (km 637 )
  2005 2006 2005 2006
As 2.2 2.275 2.692 2.382
Cd nd nd nda nd
Cu 17.5 23.5 5.15 6.1
Pb nda nd 2.767 2.364
Zn 22.0 20.92 29.73 20.0
  1. nd element not detected; the concentration values were below the detection limits
  2. a Data refer to the second half of the year (6 measurements)