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Mihaela Lungu, National Research-Development Institute for Soil Science, Agrochemistry, and Enviroment Protection (Romania)
Mihaela Monica Aldea, National Research-Development Institute for Soil Science, Agrochemistry, and Enviroment Protection (Romania)
Ovidiu Gabriel Iancu, "Al. I. Cuza" University (Romania)
Nicolae Buzgar, "Al. I. Cuza" University (Romania)
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96 soil samples from the upper horizon of soils from the surroundings of Iassy municipality were taken in which mercury contents were determined, using atomic absorption spectrometry, complete with cold vapors technique, after digesting soil samples with a concentrated sulphuric and nitric acids mixture. The analytical data were statistically computed, spreading (σ, cv%) and grouping (average value , Me, Mo) parameters were calculated.
Judging by soil types, no significant differences were noticed. The average value for forest soils was higher (0,37 mg/kg) than the values for other terrain uses. Most of the determined values range in a 0.05-0.30% content interval, which includes the normal content value, 0.10 mg/kg, according to the MAPPAM Order nr.756/1997 referring to the reference values for chemical elements traces in soil. Few values reach or exceed the intervention threshold for a sensitive use (1 mg/kg, according to the same legislation), while the intervention threshold for a sensitive use (2 mg/kg soil) is only exceeded by 2 out of the 96 samples. These samples were taken from soils in the north-eastern surroundings of the Iassy municipality, a pasture (5,81 mg/kg) and a vineyard (2,71 mg/kg). The high values may proceed from pest control products, especially in the vineyard. From a statistical point of view, in spite of a few values exceeding the alert threshold for land sensitive use (11 out of 96), the soils of the Iassy municipality surroundings, most of them with agricultural use, don't raise problems of mercury contamination.
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