High Pollution with Heavy Metals NATURA 2000 Protected Area in Bacau County, Eastern Romania
Chemical pollution in rivers ecosystems is leading towards an increase in the concentrations of heavy metals in fish body, which might have a negative impact on humans. The fish were collected from a protected Natura 2000 area in the Moldavia region, eastern Romania named �Buhusi-Bacau-Beresti� Storage basin. The aim of this study was to measure the heavy metal concentrations in water, sediment and fish meat (muscles and gills), in order to assess the human health risk due to consumption. Industrial effluents discharged into the environment pose a serious threat for the agricultural products and living organisms. In view of this, level of some heavy metals, such as: Cd, Zn, Pb and Cu present in water, sediment and fish tissue samples of fish populations from the area studied were determined using wet digestion-based atomic adsorption method. This study revealed that the maximum Cd concentration (0.911 mg/Kg) was found in fish gills of specie European Perch � Perca fluviatilis and the minimum (0.0197 mg/Kg) was found in Zander - Sander lucioperca fish muscle sample. Zn levels in fish gills of the studied samples were ranged from 108.6698 mg/Kg to 195.4167 mg/Kg. Maximum Pb concentration in gills (1.924 mg/Kg) was found in fish sample of Zarte � Vimba Vimba, while the minimum concentration (0.45 mg/Kg) was found in European Perch � Perca fluviatilis. The heavy metal found in the samples analyzed in the largest quantity is Cu, in the gills of Northernpike - Esox Lucius fish.The concentration determined in samples exceeded the World Health Organisation maximum allowances. In order to assess the risk to which humans are exposed by eating infected meat with heavy metals, the target hazard quotient (THQ) values were estimated.