Iulia Mihaela NANU, Isidora RADULOV None
Water is an important factor in ecological balances and its pollution is a current problem withconsequences more or less serious on the population. Safe drinking water is essential to humans andother life forms even though it provides no calories or organic nutrients. Access to safe drinking waterhas improved over the last decades in almost every part of the world, but approximately one billionpeople still lack access to safe water and over 2.5 billion lack access to adequate sanitation. Someobservers have estimated that by 2025 more than half of the world will be facing water-basedvulnerability. A recent report suggests that by 2030, in some developing regions of the world, waterdemand will exceed supply by 50%. Water plays an important role in the world economy as it functions asa solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation.Approximately 70% of the fresh water used by humans goes to agriculture. By water pollution, we usuallyunderstand impairing the physical, chemical and biological characteristics, produced directly orindirectly by human activities, and that makes the waters to become unsuitable for normal use in thepurposes for which such use was possible before interfering altering. In this paper we analyzed surfacewaters in order to determine its pollution degree. The main pollution factors in area are humanagglomerations, industry and agriculture. Samples were taken in the village Sag, Timis county whereagricultural pollution sources are considered most important. The parameters analyzed were pH, contentof nitrates, nitrites, ammonia and heavy metals.Water samples analysis were made in the Soil Sciencelaboratory from USAMVBT. pH was determined by potentiometric method, nitrates, nitrites and ammoniacontent by colorimetric method and heavy metals trough atomic absorption spectrometry. Exceeding themaximum limits in surface waters was determined for nitrate and ammonium. Heavy metal content hasrecorded values above limits.
nitrate, heavy metals, pollution, water
Presentation: oral