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Chemicals of Emerging Concern in Water and Bottom Sediment in the Great Lakes Basin, 2014 - Analytical Methods, Collection Methods,Quality-Assurance Analyses, and Data The U.S. Geological Survey (USGS), in cooperation with the U.S. Fish and Wildlife Service (USFWS) and St. Cloud State University (SCSU), identified the occurrence of chemicals of emerging concern (CECs) in water and bottom sediment collected in 2014 at 65 sites throughout the Great Lakes Basin. The 2014 effort is part of a long-term study that began in 2010. Included in this directory are collection methods, references to or descriptions of analytical methods used, data for samples collected in 2014, and associated quality-assurance data. Samples were collected during the periods of April to May and August to September by USGS, USFWS, and (or) SCSU personnel. Study sites include tributaries to the Great Lakes located... Categories: Data; Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Area of Concern, Emerging Contaminants, Emerging Contaminants, Great Lakes, Great Lakes Area of Concern, All tags... Great Lakes Restoration Initiative, Great Lakes Restoration Initiative, Toxicology, Toxicology, USGS Science Data Catalog (SDC), Water Quality, Fewer tags Field and Laboratory Quality Assurance Several quality-control measures were implemented in the field and at the Environmental Sampling Technologies Laboratory and the U.S. Geological Survey National Water Quality Laboratory to evaluate the integrity of the data being generated. Sample replicates and blank samples were collected in the field. Surrogate standards, isotope dilution standards, matrix spikes, reagent blank-water spikes, reagent blank-sand samples, polar organic chemical integrative sampler (POCIS) method blank samples, and POCIS method spikes were prepared in the laboratory. Quality-control measures used in 2014 were similar to those used in previous years of the study. Detailed descriptions and how the quality-control data are used can... Categories: Data; Types: Citation; Tags: Area of Concern, Emerging Contaminants, Great Lakes, Great Lakes Restoration Initiative, Toxicology Nanomaterial synthesis and characterization for toxicological studies: TiO2 case study In recent years it has become apparent that the novel properties of nanomaterials may predispose them to a hitherto unknown potential for toxicity. A number of recent toxicological studies of nanomaterials exist, but these appear to be fragmented and often contradictory. Such discrepancies may be, at least in part, due to poor description of the nanomaterial or incomplete characterization, including failure to recognise impurities, surface modifications or other important physicochemical aspects of the nanomaterial. Here we make a case for the importance of good quality, well-characterized nanomaterials for future toxicological studies, combined with reliable synthesis protocols, and we present our efforts to generate... Categories: Publication; Types: Citation; Tags: Nanoparticles, TiO2, anatase, nanoform, nanomaterials, All tags... rutile, synthesis, toxicology, Fewer tags