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Title: TOXIC METALS, CADMIUM AND LEAD IN SOIL AND PLANTS IN THE FLOODED AREA OF THE TISA RIVER

Author: A. Petrović-Gegić, J. Kanazir and F. Ileš

Year: 2009

Publisher: European Water Resources Association (EWRA)

Description:

As the result of current and historical metal mining, floodplains in many parts of the world have become contaminated by metal-rich waste in concentrations that may pose a hazard to human livelihoods and sustainable development. Environmental and human health impacts commonly arise because of the prolonged residence time of heavy metals in river sediments and alluvial soils and their bioaccumulatory nature in plants and animals. Therefore this paper points out the problem of heavy metals accumulation along the alluvial banks of the river Tisa that are used in agricultural production. The contamination of soil and plant material is of anthropogenic origin. There are facts that indicate the accident in Romania in 2000 contributed to the accumulation of heavy metals in the area around the river and their migration into plants. Measurements were conducted on the soil by the river in the vicinity of the town of Senta, and on selected fruit and vegetable sorts from that area. Considering the high concentrations of lead and cadmium and their eco-toxicity, these two metals have been specially reviewed. The residual concentration of metals available to the plant was measured in the soil at distances of 530, 580, 630 and 680 cm from the river and at 30 - 60 cm depth. As plant materials, in which the presence of various heavy metals was detected in higher concentrations, were used carrot, broccoli, summer and autumn cabbage, and berries. A highly raised content of almost all elements was found in locations flooded by the river in comparison to the soil sample taken 680 cm from the bank, which presented the reference level. The concentrations of lead and cadmium were multiply increased in some plants. In addition to this, a higher level of other toxic elements such as Cu, Zn and Se was noticeable.