A Large-Scale Identification of Sediment-Associated Risks of Contamination with Heavy Metals and Organics: Indicators and Algorithms
Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53695#.VM85jizQrzE Author(s) Yovana Todorova * , Ivaylo Yotinov , Stilyana Lincheva , Yana Topalova Affiliation(s) Department of General and Applied Hydrobiology, Faculty of Biology, Sofia University “St. Kliment Ohridski”, Sofia, Bulgaria . ABSTRACT As mediators in key biotransformation processes, the complex enzyme activities (measured as a total of extracellular and intracellular activity on sub- organism, organism and supra-organism level) have a high potential to be used as reliable indicators for risk identification in co-contaminated sediments with organics and heavy metals. Two enzyme activities—dehydrogenase activity (TTC-DHA) and phosphatase activity index (PAI) were measured by use of methods with tetrazolium chloride and p-nitrophenyl phosphate in polluted sediments of Middle Iskar River part, Bulgaria. The environmental state of river sector...