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SM ISO690:2012 POPOV, Leonid, CIUDIN, Gheorghe, ROTARU, Serghei. Soil degradation processes from pollution
. In: Chemistry Journal of Moldova, 2012, nr. 1(7), pp. 50-53. ISSN 1857-1727. |
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Chemistry Journal of Moldova | ||||||
Numărul 1(7) / 2012 / ISSN 1857-1727 /ISSNe 2345-1688 | ||||||
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Pag. 50-53 | ||||||
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Rezumat | ||||||
The Republic of Moldova is endowed with fertile soils. Soil pollution is a major concern since no
effective treatment method exists to restore the natural qualities of the soils. Polluted soil can only be rehabilitated under
the long-lasting influence of natural factors.A major source of anthropic impact on soils is the application of fertilizers
and pesticides in agriculture. At the same time, manure and livestock excreta often are transported to communal dump
sites, where they are mixed with other wastes, or are left in ravines, along the local roads and in other unauthorized
places. Instead of improving the soil productivity the nutrients find their way to and pollute the surface and ground
waters.At the same time, pollution of the soils in the vicinity of former pesticide storehouses remains a problem. More
than 200 storehouses have been dismantled during the last years and some of the remaining are in a poor condition,
unfenced, unguarded, without doors and windows, thus being sources of chemical pollution. Moldovan soils are prone
to erosion and this is how agrichemicals can travel to the water environment thus endangering water life and limiting
water uses. Investigations found HCH and DDT residuals in bottom sediments from several reservoirs and lakes as
well as the main rivers, Nistru and Prut (concentrations ranged between 0.2 and 15.8 ppb). The concentration of PCBs
in the topsoil collected beneath the capacitors battery at the Vulcănesti substation reached a level of 7100 ppm which
is exceeding the MAC by five orders of magnitude (!). With no exception, allowable concentrations of PCBs in soil
were exceeded also on the territory of other investigated substations, with peaks registered at the Briceni substation
(2545 ppm) and the Orhei substation (1959 ppm). The degradation of soils implies the reduction or total loss of their
biologic or economic productivity caused by anthropic or natural processes.
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Cuvinte-cheie soil degradation, erosion, contamination |
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