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Showing 1 to 13 of 13 for “"optical brighteners"”.
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Investigation of the Geology and Hydrology of Stone County, Missouri to Determine the Extent of Groundwater Contamination
… by sampling water from 82 springs for optical brighteners which are fluorescence dyes in detergents that are associated with groundwater contamination. Of the springs sampled with houses in their assumed recharge areas, 47 percent were positive for optical brighteners.
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Enumerating Escherichia coli (E. coli) Concentrations and Evaluating Optical Brighteners as a Potential Indicator of Human Wastewater Contamination in La Nana Bayou, Banita Creek, and their tributaries, Nacogdoches, Texas
… alone cannot identify the contamination source. Optical brighteners (OBs), chemicals found in laundry detergents, cleaning agents, toilet papers, and clothing, are unique to human wastewater. This study aimed to quantify <em>E. coli</em> concentrations and water quality in La Nana Creek, Banita …
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Time-Resolved Monitoring of Water Quality in Ozarks Springs During Storm Events
… Total Phosphorus (TIP), Total Nitrogen (TN) and Optical Brighteners by spectroscopic analysis. Automated water samplers were employed to sample spring water before and during storm events to evaluate the flushing action of increased water flow through the watershed to provide an accurate picture …
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The Use of Selected Water Quality Parameters to Identify Fecal Coliform Sources in Support of the Sinking Creek Total Maximum Daily Load.
… orthophosphates, BOD, alkalinity, hardness, and optical brighteners (OB) were monitored at fourteen stations monthly for one year. Site 3 (agricultural region) exhibited the highest average nitrate-N loadings (627.34 mg/sec) and orthophosphate (as PO<sub>4</sub><sup>3-</sup>) loadings (84.83 …
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Evaluation, Development and Improvement of Genotypic, Phenotypic and Chemical Microbial Source Tracking Methods and Application to Fecal Pollution at Virginia's Public Beaches
… analysis (ARA) and fluorometry (to detect optical brighteners in detergents) were used in the summers of 2004 and 2005 to determine the origins of fecal pollution at beaches with a past history of, or the potential for, high enterococci counts and posted advisories. At Hilton and Anderson …
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Locating Sources of Bacterial Contamination In the Toms Creek Watershed
… the Toms Creek watershed for presence of optical brighteners using fluorometry.</p> <p>We found significant spatial variation in the watershed and were able to identify one presumptive source, namely, septic systems.</p> <p>We found strong seasonal variation in bacterial concentrations …
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Comparision of the value of several analytical techniques for the discrimination of different papers
… composition, crystallinity, presence of optical brighteners and fillers, isotope ratios, Raman scattering, weight, thickness and fluorescence of the paper samples. Where possible statistical analyses were carried out of the results. This included principle component analysis. Some …
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Examining Fluorescent Decay Rates For Microbial Source Tracking In South Carolina Blackwater Systems
… coli (E. coli) as well as fluorometric optical brightener analysis to screen for contamination from human wastewater, determine if there are significant relationships between fluorescent decay signals and E. coli contamination, and examine fluorescent decay protocol applicability to …
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Straight pipes and household wastewater discharges into the rural Alabama and impact on watershed water quality with wetland land-uses
… nitrite, nitrate, dissolved organic carbon, optical indices), and microbiological (E. coli) water quality parameters. Excitation-emission matrixes (EEMs) Parallel Factor Analysis (PARAFAC) was used to identify and classify fluorescence emitting organic substances based on fluorescence peak …
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A Comparative Study of Three Bacterial Source Tracking Methods and the Fate of Fecal Indicator Bacteria in Marine Waters and Sediments
… that fluoresced at the same wavelength as optical brighteners (OBs). This project was one of the first to study the differences related to two different pollution events (CSO vs. sewage leak) while also evaluating what happens to pollution as it settles into the sediment. It was also unique …
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Microbial Source Tracking in a Mixed Use Watershed in Northern Virginia
… isolates; and iii) evaluate the use of optical brighteners in freshwater by fluorometry as an indicator for human-origin pollution. One site on each of six streams and two sites on the remaining two (ten total) were selected for E. coli and Enterococcus monitoring and microbial source …
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Fecal Matters: Fate and transport of traditional fecal indicator bacteria and source-tracking targets in septic drainfields
… FIB (E. coli and enterococci) with a chemical (optical brighteners, OB) and a molecular (Bacteroides HF183) ST target in order to evaluate their potential use as indicators of water quality issues in private drinking water systems. Eighteen PVC soil columns were constructed in an outdoor soil …
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Use of Escherichia coli for Microbial Source Tracking in a Mixed Use Watershed in Northern Virginia
… has the ability to detect the presence of optical brighteners, synthetic compounds added to such household items as laundry detergent, dishwashing detergent and other washing agents. Despite having an undesirably high rate of false negatives (negative fluorometry readings not supported by …