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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 508 for “"Water samples"”.
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Flow Injection Analysis of industrial water samples
… of chemical oxygen demand (COD) for industrial samples. The distinct advantages over conventional COD assays are the significantly reduced analysis time (FIA complete in 10 min, compared with conventional COD assay times of 120 min); simplified sample handling; significantly reduced sample …
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Quantifying Potential Sources of Microbial Contamination in Household Drinking Water Samples
… over one million households rely on private water supplies (e.g. well, spring, cistern). Previous literature acknowledges bacterial contamination in private water supplies as a significant public health concern in the United States. The present study tested private wells and springs in 20 …
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Variations in Consumer Rejection Thresholds of Water Samples Including Mixed-Berries Flavors
<p>Functional flavored water has emerged as a major space in the beverage industry in recent years. However, no research has explored the point that consumers begin to reject a specific flavor concentration within a flavored water matrix (i.e., a consumer rejection threshold). The first part of …
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Determination of pesticides and chloroanisoles in water samples using gas chromatography-mass spectrometry.
… of pesticides spiked into surface and drinking water samples and the recoveries measured.The same procedure was applied to the chromatographic determination of chloroanisoles, which are believed to result from biotic O-methylation of phenols within the environment. Methods were optimised for the …
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16S rRNA sequence analysis of silver carp microbial community in eDNA water samples
… taking triplicate environmental DNA (eDNA) water samples from 150 L tanks containing set numbers of invasive Silver Carp. Analysis eDNA samples typically involves only targeting the species of interest. However, eDNA detection alone cannot undeniably confirm the presence of the species of …
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Resin-based method for concentration of enteric viruses and F-RNA coliphages from water samples
Fecal contamination of source and recreational waters represents a public health concern due to potential content of human pathogens, and the variety of sources from which an individual may be exposed to such contamination. Enteric viruses such as noroviruses, rotaviruses, adenoviruses and …
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Development of analytical techniques for detection and remediation of polychlorinated biphenyls in soil and water samples
… 15 ng µL-1. The extraction of PCBs from soil and water samples was achievedusing the ASE and C18 (EC) SPE methods with recoveries of 81 - 94 % and 41 - 49 %respectively. Although none of the target PCB congeners were detected in soil and watersamples collected from Lagos, Nigeria, similar …
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Evaluation of storage strategies and techniques for the hydrochemical analysis of nutrients in Atlantic Ocean coastal water samples
Filtered and unfiltered samples of coastal seawater from the Atlantic Ocean (Muizenberg and Llandudno beaches, Cape Town) representing a non upwelling region and an upwelling region respectively were stored at -20 deg C. Deviations in the concentrations of silicate, inorganic phosphate, nitrite, …
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An Automated Spectrophotometric Stopped-Flow System for Reaction-Rate Measurements and Application to the Rapid Quantitative Determination of Phosphate in Soil and Water Samples
Made available in DSpace on 2014-12-10T23:01:27Z (GMT). No. of bitstreams: 1 7309916.pdf: 8180279 bytes, checksum: d7a6d2dfcd2901443949146ca66290d2 (MD5) Previous issue date: 1972
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Aqueous Atmospheric Species, a Dual Study: 1. Comparison of the Effects of Temperature, Oxygen Level, Ionic Strength, and pH on the Reaction of Benzene with Hydroxyl Radicals at the Air-water Interface to the Bulk Aqueous Phase. 2. Determination of Carbonyl Compounds in Fog Water Samples via Online Concentration and HPLC
The air-water interface is the largest interface in the environment. Atmospheric droplets, such as fog, which can have an exceptionally high surface area-to-volume ratio, also have a large range of physical and chemical properties (e.g. temperature, pH, ionic strength, and chemical composition) …
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Siphon filter assessment for Northern Ghana
The siphon filter is a household water filter developed by the Basic Water Needs Foundation based on the design of ceramic candle filters. The siphon filter is marketed under brand names CrystalPur and Tulip and is sold for roughly US$10. An independent Dutch laboratory found log reductions of …
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Development of a rapid and sensitive method to detect the parasite Cryptosporidium in drinking water
Cryptosporidium is a parasite commonly found in water and is the causative agent for the waterborne intestinal disease called cryptosporidiosis.<br/><br/>Common techniques to detect Cryptosporidium in water include the utilization of filters to trap the oocysts and the examination of the filtered …
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Peroxidase-mimicking nanomaterials for the detection of mercury (II) ions in water matrices
… due to population growth, climate change and water deprivation. Mercury (Hg) is one of the most toxic elements on Earth, and continues to cause major threats to aquatic life, human health and the environment. Toxic methylmercury (MeHg) arises from atmospheric deposition and forms through …
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Reversed-Phase Liquid Chromatography Tandem Mass Spectrometry And Elisa Determination Of Caffeine As A Marker For Sewage Contamination Of Wilgreen Lake
… to establish the contribution of domestic wastewater effluents to the lake's impairment. This was achieved by collecting samples from different locations and depth profiles from the lake and its tributaries, and analyzing them using liquid chromatography-tandem mass spectrometry coupled to an …
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The Persistence of the Bacterium Serratia Marcescens in the Intestinal Tracts of Turtles
… the recovery of the bacteria in fecal and tank water samples collected every 24 hours and plated on tryptic soy agar and an asparagine enriched agar. Findings. §erratia marcascens was recovered from 28.3% of the experimental turtles in the first fecal or water samples collected following the …
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Water quality and business aspects of sachet-vended water in Tamale, Ghana
Microbial water quality analyses were conducted on 15 samples of factory-produced sachet water and 15 samples of hand-tied sachet water, sold in Tamale, Ghana. The tests included the membrane filtration (MF) test using mColiBlue24® medium, 3MTM PetrifilmTM test, and Hydrogen Sulfide Presence …
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Environmental Study of Pesticide Residues in Soil and Water from Cotton Growing Areas in Mali
… to determine the amount of pesticide in soil and water samples collected at four cotton producing areas of Mali. The results from a survey of 24 farmers identified various concerns regarding personal and environmental safety. Despite their training, sometimes growers did not use pesticides in an …
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Roles of singlet oxygen and triplet excited state of dissolved organic matter formed by different organic matters in bacteriophage MS2 inactivation
… purified DOM isolates obtained from wastewater and river waters and three water samples collected from Singapore River, Stamford Canal, and Marina Bay Reservoir in Singapore. Linear correlations were found between MS2 inactivation rate constants (kobs) and the photo-induced reaction rate …
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