Saturday, 15 July 2006

Carcinogenic factors in soil-plant-water system of some areas from Romania.

Radu LACATUSU, Mihaela Lungu, Beatrice Kovacsovics, Doina Plaxienco, and Carolina Constantin. Research and Development National Institute for Soil Science, Agrochemistry and Environment Protection-RISSA, B-dul Marasti 61, Bucharest, Romania

Carcinogenic chemical elements and substances(nitrares, residual chlorine,heavy metals, organochlorines, biphenil polychlorinated compounds and polynuclear hydrocarbons) were determined in soils, surface ground water intercepted by wells within the built-up areas, and in some vegetables edible part from localites of contrasting areas from the point of view of cancer morbidity and death rate(Vaslui county-low values, Ilfov county, Bucharest city and Sibiu county-high values).In soils of some localities in the Ilfov county were determined nitrates contents which outrun by 2.7 times, on a average, the right limit of the normal content interval. Vegetable collected from villages of Ilfov county contain, on a average, nitrates quantities which outrun the maximum allowable limits,while those from the other studed areas have, on the average , nitrates contents within the normal content domain.The average nitrates contentes in the ground water intercepted by wells is 3.3 times higher in peripheril quarters of Buchares city, while in wells from Vaslui county the average value is lower to the maximum allowable concentration. In soil and vegetable from Sibiu county, affected by emission released by Copsa Mica non-ferrous processing work, were determined heavy metals content, Cd,Pb,Zn especially, up to 20 times higher than maximum allowable limits. Organochlorines residues were detected at content levels superior to the warning, and even intervention, threshold values only in some soils from Ilfov county and peripherial quarters of Bucharest. In the wells drinking water contents superior to the maximum allowable limits were determined only in a few samples from Ilfov county.Contents levels inferior to the maximum allowable limits values were determined in plant samples from the places that presented high contents of such chemical compounds in soil and water. Only congeners with IUPAC numbers 138, 153 and 180 of biphenyl polichlorineted compounds were detected in soil and water samples, but only below maximum allowable limits values. In soil samples from three communal territories of Ilfov county, aromatic polynuclear hydrocarbons were determined wich exceed, sometimes up to 15 times,the intervention threshold value. Out of the 16 determined compounds, crisen, benzo(b)fluorantren and benzo(k)fluorantren have, in most cases, values that overflow the intervention threshold. All the pollutants proceed from industrial emissions or agricultural technologies. A direct link can be foreseen between cancer morbidity or death rate, on the one hand, and the environment pollution with carcinogenic chemical degree, on the another hand.

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