Maximum and minimum accumulation of heavy metals by riverside and water vegetation close to industrial center of the city of Rechitsa

Water, soil and plant samples were analyzed. In water, the content of iron, copper, zinc, lead and chromium did not exceed the threshold limits in all studied sites. On the contrary, the content of cadmium, cobalt, nickel and manganese exceeded the threshold limits in some sample plots. All soil samples contained copper, zinc, cobalt, manganese, lead, nickel, chromium below the threshold limits; however, the content of cadmium in all samples was 1.75 times higher than the threshold limits. Plant samples of Potamogeton natans had the lowest content of Cu, Nuphar lutea - Zn, Sagittaria sagittifolia - Mn, Sparganium erectum - Ni. Most plant samples had a minimum accumulation of Cr within 0,010 - 0,030 ppm. Many plant samples had the similar minimum content of Pb and Cd. Lemna minor had the highest content of Cu, Ceratophyllum demersum - Zn, Cr, Pb, and Stratiotes aloides - Mn and Ni. All the plant samples had the similar maximum content of Cd. Methods: floral, geobotanical, chemical