DEPOSITION OF SULPHUR AND NITROGEN VIA
RAINWATER
(CASE STUDY - the administrative territory of the Hincesti district)
RAISA LOZAN , ANATOL TĂRÎŢĂ, RAISA ZACASOVSCHI
ABSTRACT - Deposition of Sulphur and Nitrogen from rainwater (case study – the
administrative territory of the Hincesti district)*. The quantitative estimation
of rainfall and determination of their chemical composition (samples collected
in open area and under the canopy) lead to periodic assessment of the annual
flow of ions and mineral deposits of sulfur and nitrogen oxide in the atmosphere.
In accordance with agreed European Scale for assessing levels of atmospheric
deposition it can be appreciated that the study area (Hincesti, central part of
Moldova) in 2006-2010 corresponds to the class of large sulfur deposits, varying
from 14.9 kg/ha/year (2009) to 24.8 kg/ha/year (2010). Quantities referring to
study area recorded intermediate values – 16.8 kg/ha/year and 22.4 kg/ha/year
respectively for the years 2007 and 2008.
A comparison between annual average values of sulfur deposition recorded in open
area at European level in the period 2006-2010 lies in the study area comparable
to the central-eastern Europe region, exceeding 60% of the average. In relation
to this scale deposition of total nitrogen (from nitrate ion and ammonium ion)
are small-sized deposits in the area, with averages ranging from 2.2 to 4.3
kg/ha/year N-NO3- and 7.2-9.3 kg/ha/year for N-NH4+. There are slight
oscillations of annual averages from year to year that do not exceed 0.6 kg/ha/year.
Keywords: air pollution, rainfall, sulfur and nitrogen deposition, heavy metals,
mineral ion flows and hydrogen ion.