abstract. To ensure traffic safety in winter, large amounts of technical salts (chlorides) are applied on roads. De-icing salts directly or indirectly contaminate the road environment and have a negative effect on the components of road environment. The analysis of the situation raises a question: how to ensure traffic safety in wintertime applying salts and achieve sustainable development. The article presents the investigations of chloride concentrations on the roadsides of a highway. In 5 recent years, complex environmental laboratory investigations and investigations under natural conditions of the effect of salts on the components of the road environment have been carried out proving their toxic effect. Consequently, to reduce a negative effect of salts on the road environment, measures of sustainable ecological development have to be taken. To achieve a balanced use of salts, the proposal is to apply alternative materials (formiates, molasses-based material). The introduction of biotechnical measures (an infiltration-grassy ditch, biological and chemical indication on roadsides) is expedient to eliminate the consequences but not the reasons of salt use.Keywords: sustainable ecological development, road maintenance salts, chloride in roadside soil, antipollution of road environment, vegetation saving.reference to this paper should be made as follows: Baltrėnas, P.; Kazlauskienė, A. 2009. Sustainable ecological development reducing negative effects of road maintenance salts, Technological and Economic Development of Economy 15(1): 178-188.
Plants experience a number of stresses in the environment, including those caused by salts, drought, heavy metals and frost. To maintain safety during winter, deicing salt (sodium chloride) is sprinkled over roads. In global practice, natural and laboratory investigations of the impact of road maintenance salts on various species of plants are carried out. So far in Lithuania, only single cases of such investigations have occurred. The aim of this investigation is to determine which of the analysed herbaceous vegetation species (perennial ryegrass, fescue grass, meadow-grass) shows the highest degree of resistance to toxic impact of salts (stress), to set the toxic limits of salt concentrations and to analyse how salts impact on the core parameters of herbaceous vegetation. The investigation proves that NaCl content in the soil negatively affects the growing process of grass vegetation, i e it slows down increase of its above-ground part and reduces its phytomass. During experiments it was determined that perennial ryegrass had the highest degree of resistance to toxic impact of salts.
The main aim of this study was to characterize heavy metal compounds of sweep sand particles in the city of Vilnius (lithuania). These research results provide new insight into the distribution and variation of heavy metal compounds in sweep sand in the studied area. The results of this investigation reflect the level of heavy metal pollution during the winter season, thus can be used to judge the quality of storm water flowing from streets. The major heavy metals found to have accumulated were lead, nickel, zinc and copper. These research results are useful for conducting preliminary evaluations of possible heavy metal pollution in other similar cities within the european union. The general anthropogenic factor of three main types of land-use has the greatest influence on contamination of urban topsoil. in industrial sites, concentrations of key contaminants (Pb, Cu, Mn, ni) are significantly higher than in residential and public-residential areas. The present article discussed the significance of systematic sustainable evaluation as one of the most important activities associated with a sustainable approach. Consequently, to reduce a negative effect of salts on street environment, measures of environmentally sustainable development have to be undertaken.Keywords: heavy metals, deicing salts, sweep sand, sustainable development, valuation of environmental effects, environment and development.Reference to this paper should be made as follows: Kazlauskienė, A.; Valentukevičienė, M.; ignatavičius, G. 2013. sustainability assessment of heavy metals and road maintenance salts in sweep sand from roadside environment,
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