The current standards used for nitrogen pollution evaluation are lacking, and scientific classification methods needed to improve water quality management capabilities. This study addresses the important issue of assessing surface by utilizing two advanced multivariate statistical techniques: self-organizing maps (SOMs) obtained using K-means algorithm Hasse diagram technique (HDT). research ta...

Sensor technologies offer particular advantages for surveillance, early warning and process control. This work aimed to provide information about practical new sensing devices that can be used for rapid field assessment of water pollution. A questionnaire completed in 2002 gathered information and data for a catalogue of sensors and instruments that can potentially be applied to soils, sediment...

Accurate estimation of the variability of heavy metals in river water and the hyporheic zone is crucial for pollution control and environmental management. The biotoxicities and potential ecological risks of heavy metals (Cu, Zn, Pb, Cd) in a solid-liquid two-phase system were estimated using the Geo-accumulation Index, Potential Ecological Risk Assessment and Quality Standard Index methods in ...

Biochemical fingerprinting (BF) databases of 524 enterococci and 571 Escherichia coli isolates and an antibiotic resistance analysis (ARA) database comprising of 380 E. coli isolates from four suspected sources (i.e. dogs, chickens, waterfowls, and human sewage) were developed to predict the sources of faecal pollution in a recreational coastal lake. Twenty water samples representing four sampl...

Assessment of seasonal changes in surface water quality is an important aspect for evaluating temporal variations of river pollution due to natural or anthropogenic inputs of point and non-point sources. In this study, surface water quality data for 16 physical and chemical parameters collected from 22 monitoring stations in a river during the years from 1998 to 2001 were analyzed. The principa...

there are 3700 wells in tehran city, of which 850 are deep wells. to determine tehran ground water quality, as a pretest we selected 102 wells by simple random sampling; water analyses were made according to the latest edition (1985) of the standard methods. comparisons of the obtained results with who standards show that only 0.98% of the samples go beyond the maximum desirable concentration o...

Introduction Pollution can be defined in several ways. Water pollution occurs when energy and other materials are released into water. It includes all of the waste materials that cannot be naturally broken down by water. In other words, anything that is added to the water, above and beyond its capacity to break it down, is pollution. In certain circumstances pollution can be caused by nature it...

Florida’s coastal environment is especially vulnerable to nonpoint source pollution for two reasons. One, the extent of the karst nature of the platform allows great interaction between ground and surface waters. Second, the low gradient of the land results in high water tables. Both of these factors result in poor attenuation of contaminants in the subsurface, and the release of nutrients and ...

The main aim of the international UNECE monitoring program ICP Waters under the Convention of Long-range Transboundary Air Pollution (CLRTAP) is to assess, on a regional basis, the degree and geographical extent of the impact of atmospheric pollution, in particular acidification, on surface waters. Regional trends are calculated for 12 geographical regions in Europe and North America, comprisin...