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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 55 for “"water sample"”.
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Development of a water sample concentrator for the concentration of bacteria in drinking water
A water sample concentrator utilizing a membrane adsorption/elutriation procedure for bacterial recovery was developed and field-tested. Influent sample volumes of 19.0 liters were processed by the concentrator within 10 minutes. Standard MPN and membrane filtration tests were conducted to …
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The quality of water sample from Maungani community domestic water pots, Limpopo Province, South Africa
See the attached abstract below
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A procedure for the estimation of total radioactivity in water
… especially fallout of fission products, in a water sample. As yet no method of analysis both simple and rapid enough for application to mobile operation has been developed.</p><p>It was the purpose of this research to develop and refine a simple, rapid, quantitative procedure for the detection …
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Waste stabilization ponds: Possible contamination of the shore
… due to contamination of the shore line. Soil samples were taken at various points along the bank and water samples were collected from the pond. Coliform and enterococci counts were made from the samples and were employed in conjunction with observations made of conditions at the sample points …
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Detection and quantitation of diazinon and chlorpyrifos : a novel GC
… two widely used pesticides in local water pathway. Solid phase extraction combined with GC/MS detection with selected ion monitoring was employed. In establishing calibration curves for GC/MS analysis, it may be impractical to use isotope-labeled analogs as internal standards for all …
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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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The Eutrophic Status of Ten Central Iowa Lakes
… fall of 1975 and the spring of 1976, composite water samples were taken from the euphotic layer of each lake. Each water sample was then subjected to various tests including: alkalinity, free carbon dioxide, specific conductance, pH, nitrate and nitrite nitrogen and ortho and meta phosphate. …
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Microbial Source Tracking in a Mixed Use Watershed in Northern Virginia
… developing Northern Virginia region, contains watersheds of mixed rural and urban/suburban uses. As part of Virginia regulations, recreational waters must be tested and remain under a certain standard for levels of fecal indicator bacteria (FIB). The sources of fecal pollution in neighboring …
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Determination of ground-water tracer 2,6-difluorobenzoic acid by Gc/Ms
… method for the determination of the ground water tracer, 2,6-difluorobenzoic acid (2,6-DFBA) at the part per billion level was established. Three sample preparation methods, which include two methylation methods and one silylation method, have been evaluated. Chromatographic instruments …
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Health and water quality monitoring of Pure Home Water's ceramic filter dissemination in the northern region of Ghana
Pure Home Water (PHW) is a social enterprise that promotes and disseminates household drinking water technologies in the Northern Region of Ghana. Currently their main product is a pot-shaped Potters for Peace-type ceramic water filter, locally known as the Kosim filter. This study used household …
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Detection of chemical nutrients in water using a fluidic microplasma chip with enhanced optical collection efficiency
… signal. The detection of nutrients in water using this chip has been demonstrated. The detailed explanations of the basic principle of glowing microdischarge signal, the fluidic microplasma chip, the operating optical system, the concentration testes and result data analysis will be …
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Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating
… extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) consists of two subsystems – one for sample introduction, acidification, and carbon dioxide extraction, and one for carbon …
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Host Specific Microbial Source Tracking and Quantification Using a Partial 16SrRNA Sequence of Bacteroides on the Finley River, a Tributary of the James River in Southwest Missouri
… contamination found in an environmental (usually water) sample. These methods include both phenotypic and genotypic strategies. In this study, quantitative PCR was used to evaluate water samples for species specific (cow and human) Bacteroides in the Finley River. The Finley River is susceptible …
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Quantifying Chlorophyll a Content Through Remote Sensing: A Pilot Study of Utah Lake
… Environmental Protection Agency as an "impaired water body" and must be closely monitored. Because of its large extent and shallow depth the water quality is heterogeneous and can change rapidly. This means that traditional water quality monitoring methods, which require large investments in …
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Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating
… extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating. The Rapid Extraction of Dissolved Inorganic Carbon System (REDICS) consists of two subsystems - one for sample introduction, acidification, and carbon dioxide extraction, and one for carbon …
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Development of a Rapid Coliphage Assat
… time and an incubation of subculture with water sample for two hours. Color development occurred at 37 o C in 30 minutes. The changes and modifications of the assay increased the ease of its performance without sacrificing the ability of the assay to detect as few as two phage particles per …
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THE INFLUENCE OF FULVIC ACID ON COPPER(II), CADMIUM(II) AND ZINC(II) REMOVAL FROM DRINKING WATER BY ALUM COAGULATION AND COPPER(II) AND CADMIUM(II) COMPLEXING CAPACITY MEASUREMENTS OF FULVIC ACID AND NATURAL FRESHWATER SAMPLES BY DIALYSIS TITRATION
… of organic ligands commonly found in drinking water sources is the object of the studies in this dissertation. These ligands, called humics as a class, were modelled in some cases by a soil-derived humic material called fulvic acid. The role of natural humics in the transport and speciation of …
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Development of chemosensors for endocrine disrupting chemicals (EDCs): synthesis and evaluation of solid-phase bound receptors
… general, solid-phase extraction (SPE) of aqueous samples is a widly applied technique to enrich pollutants. With the current SPE cartridges, the extraction efficiency of the pollutants depends on their polarity. Thus polar compounds stay in the water sample while apolar compounds are retained on …
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Development of micro-scale and automated membrane extraction systems for water analysis
Monitoring of trace level contaminants in water involves the extraction and enrichment of analytes. Over the years several techniques have been developed for this purpose. Currently there is an urgent need for the development of micro-scale extraction techniques that can lead to simple, fast trace …
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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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