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      Assessment of nutrient and heavy metal contamination in surface water and sediments of the upper Tigris River, Turkey

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      CATENA
      Elsevier BV

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          NONPOINT POLLUTION OF SURFACE WATERS WITH PHOSPHORUS AND NITROGEN

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            Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems.

            Numerical sediment quality guidelines (SQGs) for freshwater ecosystems have previously been developed using a variety of approaches. Each approach has certain advantages and limitations which influence their application in the sediment quality assessment process. In an effort to focus on the agreement among these various published SQGs, consensus-based SQGs were developed for 28 chemicals of concern in freshwater sediments (i.e., metals, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and pesticides). For each contaminant of concern, two SQGs were developed from the published SQGs, including a threshold effect concentration (TEC) and a probable effect concentration (PEC). The resultant SQGs for each chemical were evaluated for reliability using matching sediment chemistry and toxicity data from field studies conducted throughout the United States. The results of this evaluation indicated that most of the TECs (i.e., 21 of 28) provide an accurate basis for predicting the absence of sediment toxicity. Similarly, most of the PECs (i.e., 16 of 28) provide an accurate basis for predicting sediment toxicity. Mean PEC quotients were calculated to evaluate the combined effects of multiple contaminants in sediment. Results of the evaluation indicate that the incidence of toxicity is highly correlated to the mean PEC quotient (R(2) = 0.98 for 347 samples). It was concluded that the consensus-based SQGs provide a reliable basis for assessing sediment quality conditions in freshwater ecosystems.
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              Assessment of surface water quality using multivariate statistical techniques: A case study of the Fuji river basin, Japan

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                Author and article information

                Journal
                CATENA
                CATENA
                Elsevier BV
                03418162
                May 2012
                May 2012
                : 92
                :
                : 1-10
                Article
                10.1016/j.catena.2011.11.011
                7f618282-1e20-4d34-9b46-3b995e068bac
                © 2012

                http://www.elsevier.com/tdm/userlicense/1.0/

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