As a result of the river regulation a number of oxbow lakes have arisen in the floodplain of the Lower-Tisza. The floodplain lakes represent natural values and major recreation areas of the lowland region. Due to the human activity the oxbow lakes' condition declined. It can be shown by the water quality, the channel discharge by deposit, the h
...igh eutrophication of the lakes and the heavy metal elevation of the sediment. Discovering these processes, analysing the condition and recultivation of the oxbow lakes came into prominence only in the past few years. Our research aims to conclude the current environmental pollution of the oxbow lakes from statistical analyses of the heavy metal content of the sediment and from the water quality data. The oxbow lakes have been classified by chemistry instead of chemical. Results of the research show differences between the floodplain oxbows and the lakes outside the dam in terms of the quality of the sediment and the nutrient content of the water.
The soils of the big cities, owing to the various anthropogenic activities, can be contaminated by heavy metals. The surroundings of the roads with heavy traffic as significant metal emitter source can be contaminated by heavy metals. The hobby gardens and the vegetable gardens directly along roads can be potential risky for people sin
...ce unknown amount of heavy metals can be accumulated into organization of local residents due to consumption of vegetables and fruits grown in their own garden. Most metals are well-known to have toxic characters but we have known little what extent these metals exert influence on people living directly along road with busy traffic. During our research, metal contamination has been investigated in the gardens near the roads with heavy traffic in Szeged by measuring of metal contents in soil and plants samples. Enrichment factor has been calculated with the help of control soil samples far from roads having heavily traffic. Besides determination of the metal content of soil and plant samples, soil properties basically influencing on metal mobility has been examined in order to characterize the buffering capacity of the studied soils. The health risk quotients have also been determined to evaluate human health risk of the contaminated soils.