Abstract. In the period 1984-1990 the following vegetables were grown: red beet, carrot and parsley in four allotment gardens of Ptock city (Central Poland), situated near the refinery and petrochemical works. Cadmium, lead, copper, chromium, zinc and manganese concentrations were determined in the leaves and roots of vegetables, The heavy metal accumulation in the soil, dustfall (measure of air pollution), and ground water was determined. The quality of the vegetable yield, notably of the leaves, was low. This was mainly due to the excessive chromium and cadmium content in the leaves. Accumulation of heavy metals was relatively low in the soil, rather high in the ground water and variable in the dust.
Soil concentration of selected polycyclic aromatic hydrocarbons around the Petrochemical Plant in Płock in [1987][1988][1989][1990][1991][1992][1993][1994][1995][1996][1997][1998][1999][2000][2001][2002][2003][2004][2005][2006]. The Petrochemical Plant Orlen S.A. in Płock was constructed in the 1960s as one of the largest objects of this type in Europe. The facility was unfortunately located among agricultural areas. In the 1990s the plant implemented a number of investments aimed at lowering pollutant loads released to the environment. There is no information, however, whether these investments were successful in decreasing soil pollution with tar substances and polycyclic aromatic hydrocarbons (PAH) and raising the security level for agricultural production within the area. The aim of the research was, therefore, to provide this information. The research was conducted within the agricultural area around the plant. Soil samples were collected in the north-eastern direction from the facility, at fi ve research points at: 1 km, 3 km, 6 km, 12 km and 18 km distances. Concentration of tar substances and PAHs was evaluated and compared with the data from 1987. The results show that PAH emissions from the plant decreased due to the aforementioned environmental investments, which in turn resulted in a signifi cant drop of PAH concentration in soils in around the plant (1-3 km). Nevertheless, their level is still high (especially 1 km away from the refi nery) when compared with uncontaminated sites.
Heavy metal content in soil and consumption yield in the vicinity of petrochemical plant The research on soil and consumption yield quality at the impact zone of the petrochemical plant in Płock (ZRiP), conducted in the 1970s and 80s, proved that the emissions from the plant threatened the agricultural production within the area. As the emission levels from the ZRiP have significantly dropped in recent years, analyses were conducted in order to assess the current content of Cd, Cr, Cu, Ni, Pb and Zn in soils as well as in wheat grain and potato tuber cultivated within the area. The results showed that the soils were not contaminated with above mentioned heavy metals, but the level of cadmium was exceeded in potato tubers collected from three research points and in wheat grain collected from one point.
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