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Dissertations / Theses on the topic 'Trends in water chemistry'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Wilson, Keith Neville. "Effect of composition on empirical stability trends for oil-in-water emulsions." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/26230.

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Relative stabilities of paraffin oil-in-water emulsions were determined empirically as a function of increasing ionic strength, surfactant type or concentration, droplet size, pH and calcium(II) concentration. Stabilities were measured by droplet size changes, planar interface oil droplet coalescence times, creaming rates and photography. Stability trends between methods were compared. Conclusions were derived in terms of creaming and coagulation. The trends below were discussed in terms of theories of emulsion stability. 1. Increased surfactant concentrations stabilised the emulsions against

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2

Strong, William A. "Temporal water chemistry trends within individual springs and within a population of Florida springs." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008963.

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3

Korsman, Tom. "Acidification trends in Swedish lakes : an assessment of past water chemistry conditions using lake sediments." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-140821.

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This thesis presents temporal perspectives of lake acidification in Sweden. Sediment records have been used to study timing, trends and causes of acidification, and two different techniques for assessing past lake-water acidity are presented. A new technique for pH prediction, based on near-infrared (NIR) spectroscopy of surface sediments, is developed. This study shows that there is a pH related fraction of lake sediments that can be recorded by NIR analysis. Relationships between NIR spectra of surface sediment samples and measured lake-water pH values, and between NIR spectra of sediment co

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4

Bymers, Leah. "The effects of changes in flow on the ecological condition of two Arizona streams analysis of trends in water chemistry and structure of biological assemblages /." Thesis, The University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_etd_hy0076_sip1_w.pdf&type=application/pdf.

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5

Nassar, Raymond. "Chlorine, Fluorine and Water in the Stratosphere: Chemistry, Transport and Trends based on ACE-FTS measurements." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/1266.

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The Atmospheric Chemistry Experiment (ACE) is a satellite mission for remote sensing of the Earth's atmosphere using the solar occultation technique. The primary instrument on this satellite is the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS). ACE-FTS retrievals are described with a focus on the creation of <em>a priori</em> temperature and pressure profiles. ACE-FTS measurements are then used to investigate the chemistry, transport and trends of chlorine, fluorine and water in the stratosphere, leading to an improved understanding of processes affecting b

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6

Ness, Lindsay Anne. "Solute deposition to an upland catchment : spatial patterns, temporal trends and links to stream water chemistry." Thesis, University of East Anglia, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429683.

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7

Kulkarni, Akshata. "TOWARDS THE DEVELOPMENT OF NOVEL POLYMERIC MATERIALS FOR OIL/WATER SEPARATION AND IMPROVED FUEL EFFICIENCY." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1619104153825481.

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8

Shrivastava, Asheesh. "Environmental Chemistry of Lake Biwa, Japan: General trend in the changes of water quality judged from the long-term variation and the characteristic distribution of nutritious elements." Kyoto University, 2010. http://hdl.handle.net/2433/120451.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第15485号<br>人博第515号<br>新制||人||125(附属図書館)<br>21||人博||515(吉田南総合図書館)<br>27963<br>京都大学大学院人間・環境学研究科相関環境学専攻<br>(主査)教授堀智孝, 教授杉山雅人, 教授石川尚人<br>学位規則第4条第1項該当

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9

Tilja, Marie. "Water colour trends in Lake Mälaren." Thesis, Linköping University, Department of Thematic Studies, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2199.

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<p>The aim of this thesis was to determine whether there has been a trend of increasing or decreasing water colour, absorbance, in Lake Mälaren during the last 35 years and whether it could be correlated with water discharge. The discharge was accounted for using regression analysis. The data material was analyzed for trends using a nonparametric test, the so-called seasonal Mann- Kendall test. The regression model could only account for a small (maximum of 24%) variation due to discharge. Thisindicates that discharge single-handedly can not explain the variation in absorbance. The trend analy

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10

Aguiar, Ana Raquel Batista. "Trends in deep-water shark fisheries in the Azores." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15485.

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Mestrado em Biologia Marinha<br>Deep-sea resources have been increasingly exploited, and due to that, several ecosystems and species have been considerably affected. Deep-water sharks populations have been of the most disturbed by practices of unselected fisheries, bycatch and discard, mainly due to their low commercial value. Those practices make deep-water sharks very vulnerable to overfishing given their life-history traits, increasing their extinction risk. With the prohibition of the direct fishery, and implementation of quotas and TACs (Total Allowable Catches) regarding the deep-sea sh

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11

Smith, Claire Anne. "The radiative effects of observed trends in stratospheric water vapour." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395646.

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12

Herman, Melissa C. "Laboratory Evaluation and Soil Test Phosphorus Trends in Ohio." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308336863.

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13

Neary, Daniel G., and John N. Rinne. "Base Flow Trends in the Upper Verde River Revisited." Arizona-Nevada Academy of Science, 2001. http://hdl.handle.net/10150/296567.

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14

Chun, John Hwan. "Modeling of BWR water chemistry." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13660.

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15

Ngwenya, Faith. "Water quality trends in the Eerste River, Western Cape, 1990 - 2005." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2843_1189582559.

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<p>The Eerste River is a river system which has, over the years, been subjected to human interference. The purpose of this study was to investigatge temporal and spatial trends in the water quality of the Eerste River between 1990 and 2005. The study results revealed that the major trends in the water quality of the Eerste River are more spatial than temporal.</p>

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16

Young, Toby Edward. "Water-only chemical analysis methodologies : investigations of water liquid chromatography, subcritical water extracton, and dynamic surface tension detection /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/8528.

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17

Smith, Jessica M. "Water quality trends in the Blackwater River watershed Canaan Valley, West Virginia." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3361.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains vi, 73 p. : ill., maps. Includes abstract. Includes bibliographical references.

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18

Aragon, Jennifer M. "Spatial and temporal trends in water quality in the Alafia River watershed." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003163.

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19

Kea, Kandace. "An Analysis of Trends in U.S. Stormater Utility and Fee Systems." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/53704.

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Many municipalities have established stormwater user fees (SUFs), commonly known as stormwater utilities, to raise revenue for stormwater management programs, however little is known about the trends among the fees currently in existence. This research observes trends in the establishment, type and magnitude of user fees by analyzing location, population density, home value, and establishment for a comprehensive national stormwater user fee database with data for 1,490 user fees. The Equivalent Residential Unit (ERU), a SUF that charges based on impervious area, was the most prevalent fee type

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20

Limbrick, Kelvin James. "Hydrogeochemical variability since 1858 in the chalk aquifier of south Dorset, UK : water resource implications." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250637.

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21

Dudd, Lucinda M. "Organic chemistry in high-temperature water." Thesis, Nottingham Trent University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403413.

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22

Ghasdian, Negar. "ABC terpolymers : micelles, polymersomes and stabilisation of water in water emulsions." Thesis, University of Hull, 2013. http://hydra.hull.ac.uk/resources/hull:8621.

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Polymersomes are vesicles formed from block copolymers. Their large internal volumes and thick walls make them very attractive for the encapsulation of different species. However, a major issue which prevents the use of polymersomes in most of the applications is that the encapsulation efficiency of payload molecules using current encapsulation methods is too low. This problem is thought to be related to the formation mechanism of polymersomes through self-assembly of the constituent block copolymer molecules. This project is concern with employing a fundamentally different strategy for polyme

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23

Rahmani, Vahid. "Assessing impacts of climate change on Kansas water resources: rainfall trends and risk analysis of water control structures." Diss., Kansas State University, 2014. http://hdl.handle.net/2097/18342.

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Doctor of Philosophy<br>Department of Biological & Agricultural Engineering<br>Stacy L. Hutchinson<br>Precipitation impacts hydrologic structures, agricultural production, water resources management, and recreational activities, all of which significantly affect a state’s economy. Water control structure design is based on the maximum runoff rate resulting from storms with a specific return period and duration. The Rainfall Frequency Atlas (National Weather Service Technical Paper 40, 1961) (TP-40) provided statistical rainfall analysis as the basis for hydrologic structure design until the in

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24

Neary, Daniel G., and John N. Rinne. "Baseflow Trends in the Upper Verde River Relative to Fish Habitat Requirements." Arizona-Nevada Academy of Science, 1997. http://hdl.handle.net/10150/296476.

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25

Grover, David J. (David Joseph). "Modeling water chemistry and electrochemical corrosion potential in boiling water reactors." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/39772.

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26

Gutkowski, Sarah. "Water-in-oil and oil-in-water emulsions stabilized by octenylsuccinic anhydride modified starch and adsorption of modified starch at emulsified oil/water interfaces." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32842.

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Master of Science<br>Department of Grain Science and Industry<br>Yong Cheng Shi<br>Emulsions are utilized to help control phase separation and are found in many products ranging from food to pharmaceuticals. Because of the hydrophobic properties of its functional group, octenylsuccinic anhydride (OSA) modified starch is commonly used in oil in water (o/w) emulsions. The first objective of this study was to investigate if OSA modified starch could be used in water in oil (w/o) emulsions. Experiments were designed to determine the effects of concentrations of OS starch, mineral oil and water on

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27

Doliber, Sarah Rebecca. "Groundwater Surface Trends in the North Florence Dunal Aquifer, Oregon Coast, USA." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/530.

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The North Florence Dunal Aquifer is the only feasible source for drinking water for the coastal city of Florence, Oregon and Florence's Urban Growth Boundary. High infiltration rates and a shallow groundwater table leave the aquifer highly susceptible to contamination from septic tank effluent, storm runoff, chemical fertilizers and recreational ATV use throughout the dunes. Public interest in the quality and quantity of the aquifer water has been sparked since the City of Florence received a grant from the Environmental Protection Agency for a watershed protection and restoration project. Del

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28

Ammon, Leigh Auwers. "Trends in Water Quality within the Broward County Portion of the Biscayne Aquifer." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/868.

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Continuous and reliable monitoring of contaminants in drinking water, which adversely affect human health, is the main goal of the Broward County Well Field Protection Program. In this study the individual monitoring station locations were used in a yearly and quarterly spatiotemporal Ordinary Kriging interpolation to create a raster network of contaminant detections. In the final analysis, the raster spatiotemporal nitrate concentration trends were overlaid with a pollution vulnerability index to determine if the concentrations are influenced by a set of independent variables. The pollution v

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29

Gildea, Jason James. "Relationships Between Land Use, Land-Use Change, and Water-Quality Trends in Virginia." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/33253.

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This research examines the relationships between land use and surface water quality trends in Virginia. Data from 168 surface water quality monitoring stations throughout Virginia were analyzed for trends for the period of 1978 to 1995. Water-quality data available at these stations included dissolved oxygen saturation (DO), biochemical oxygen demand (BOD), pH, total residue (TR), non-filterable residue (NFR), nitrate-nitrite nitrogen (NN), total Kjeldahl nitrogen (TKN), total phosphorus (TP), and fecal coliform (FC). A seasonal Kendall analysis was used to determine trends for each water-qual

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30

Nsubuga, F. W. N. (Francis Wasswa Nkugwa). "Climate variability and its implication for water resources and livelihoods in Uganda." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/40256.

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This thesis examines the climatic trends of rainfall and temperature in Uganda using historical data. And because climate is an important aspect in water resources management and livelihoods formation, an attempt to explain how the interaction impacts on the two is made in the context of climate variability and change. The assumption is that climate change/variability has had an effect on water resources management and the way individual, households and society at large form livelihoods in Uganda. The rationale for the investigation is the number of climate and livelihood related studies that

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31

Wang, Ying. "Theoretical Studies on Artificial Water Splitting-Water Oxidation and Proton Transfer." Licentiate thesis, KTH, Teoretisk kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102566.

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The present thesis is concerned with the theoretical studies on artificial water splitting process. As the quick development of research on utilizing of solar energy, which is a green, clean, and renewable energy source, many research groups focus their attention on artificial photo-synthesis systems inspired by the photosystem I and II. The overall reaction in these artificial systems is water splitting to oxygen and hydrogen. Artificial water splitting can generally be divided into two half reactions, catalytic water oxidation and catalytic proton reduction. There is an increasing interest a

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32

Sayed, Shakeela. "Remediation of water using modified chitosan." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/6361.

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Includes bibliographical references.<br>Water treatment has been an area of increasing concern over the last decade. This interest is due to exponential increase in demand of already limited water sources. Therefore the treatment of wastewater for re-use is a topic of great interest. The treatment applied depends on the source and quality of the water. Common water treatment options include filtration, flocculation, coagulation, lime softening, reverse osmosis and clarification to name a few. In addition, water should also be treated for the presence of harmful micro-organisms which is normall

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33

Walker, I. M. "The formation and evaluation of water-in-oil-in-water multiple emulsion systems." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371137.

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34

Huntress, David William. "Chemical Dynamics During High Discharge Events at Three Forested Catchments in Eastern Maine, USA." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/HuntressDW2008.pdf.

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35

Gove, Nancy Elizabeth. "Detecting relationships between land use and water quality trends : questions of association, scale, and independence /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6362.

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36

Tuladhar, Aashish. "Structure and Dynamics of Water Next to Mineral Surfaces." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/420679.

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Chemistry<br>Ph.D.<br>Vibrational sum frequency generation (vSFG) spectroscopy is a second order non-linear technique that can efficiently and selectively investigate an interface between two media. vSFG spectroscopy has been frequently used to interrogate the mineral/water interface by probing the interfacial O−H stretch, which is an excellent reporter of its hydrogen bonding environment. My work, described in this dissertation, is focused on using steady-state and time-resolved vSFG spectroscopy to understand how (a) the type of mineral, (b) the crystalline faces of the mineral, (c) the surf

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37

Wang, Ruifu. "The Solution Behavior of Abundant Metals based Water Oxidation Catalysts." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1460301627.

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38

Brown, Stacy D. "The Formula For Water." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etsu-works/5257.

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39

Morten, Christopher J. (Christopher John). "Endo-selective epoxide-opening cascades in water." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65271.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2011.<br>Vita. Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Chapter I. Introduction to the Ladder Polyethers. We introduce the bioactivity of the ladder polyether natural products and provide an overview of the puzzle that is their biogenesis. Cascades of endo-selective epoxide opening inspired by the biosynthetic proposal and promoted by simple neutral water can provide efficient access to these compounds. Chapter II. Water-Promoted Epoxide Opening Accommodates Methyl Substitution.

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40

Mokoena, Allistair Frans. "Water dynamics about selected monosaccharides in solution." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13382.

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Includes bibliographical references.<br>The solubility of molecules in water is governed, amongst other things, by the inherent properties of the solute molecules and water molecules. Water molecules are able to simultaneously form hydrogen bonds as donors and acceptors and thus have unique properties as solvent molecules. These properties influence how water interacts with solute molecules. The mechanism of hydrogen bond exchange plays a role in the hydration of solute molecules. A key to understanding some of the biological processes lies in understanding how solutes interact with water. In

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41

Roger, Barba Isolda. "Investigations into electrochemical water splitting." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8228/.

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The work detailed in this thesis is organized in the following manner: In Chapter 1 we discuss electrochemical and photoelectrochemical catalysts in the context of their application for solar-to-hydrogen devices. During this introduction we will give an overview of the current state of the field, discussing the different kinds of materials that are being investigated before giving a brief description of some actual solar-to-hydrogen devices and finishing with a discussion of the current and future challenges in the field. Chapter 2 is a description of the different techniques used throughout t

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42

Kuo, Yenting. "Photocatalytic water splitting." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/12141.

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Doctor of Philosophy<br>Department of Chemistry<br>Kenneth J. Klabunde<br>New photocatalystic materials Ti-In oxy(nitride) and nanosized Ru-loaded strontium titanate doped with Rh (Ru/SrTiO3:Rh) have been synthesized. The textural and surface characteristic properties were studied by nitrogen BET analysis, diffuse reflectance UV-vis spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy and powder XRD. The photocatalytic properties were enhanced by the binary metal oxides of titanium dioxide and indium oxide. The XRD patterns confirmed th

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43

Gawenis, James Allen. "Aspects of the environmental chemistry of technetium /." free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3012968.

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Withers, Anthony Charles. "Water in the mantle." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390105.

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Grimminger, Marsha Loth. "PERIODIC TRENDS IN STRUCTURE FUNCTION RELATIONSHIP OF ORGANIC HETEROACENES." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/850.

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Our group has previously shown that small changes to molecular structure result in large changes to device properties and stability in organic electronic applications. By functionalizing aromatic heteroacenes with group 14 and group 16 elements, it is possible to control morphology and improve stability for a variety of applications such as thin film transistors and solar cells. Functionalization within the heteroacene core led to changes in electronic structure as observed by electrochemistry and light absorption. By substituting down the periodic table, the carbon heteroatom bond length incr

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46

Mahmood, Hosam Rifaat. "Groundwater chemistry and water table variations in Bahrain." Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/11707.

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An evaluation has been carried out of the groundwater system in Bahrain. It has involved the collection of water samples from all the water bearing formations to study the quality of the groundwater. Each water sample was tested physically, chemically, and bacteriologically. Additionally, the five day biochemical oxygen demand test and hydrogen sulphide were detected. The period of the actual sampling and testing extended from mid-1990 to the beginning of 1992. The results obtained have been compared to the results of an earlier study conducted between 1978 and 1979. The investigation has also

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47

Wong, Wing-sze. "Water chemistry in the Kam Tin basin, natural and authropogenic influences." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38605843.

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48

Barker, Jason Alan. "Investigations of Liposome/Water Partitioning Using Electrokinetic Chromatography." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-01072005-041518/.

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In this two-part investigation, Linear Solvation Energy Relationship (LSER) models were applied to liposome/water partitioning data determined by liposome electrokinetic chromatography (LEKC). In the first part of the study, LEKC retention factors were determined for a set of 71 solutes including 50 neutral aromatic solutes and 21 neutral drugs using the liposome phases mM DPPG20DPPC80, 15 mM DPPG20DPPC80/3 mM cholesterol, and 15 mM DPPG20DPPC80/6 mM cholesterol. These retention factors were used to determine linear solvation energy relationships (LSER) models for each of the three lipid phase

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49

Eaves, Joel David 1976. "Vibrational dynamics in water from the molecule's perspective." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30206.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2005.<br>Vita.<br>Includes bibliographical references.<br>Liquid water is a fascinating substance, ubiquitous in chemistry, physics, and biology. Its remarkable physical and chemical properties stem from the intricate network of hydrogen bonds that connect molecular participants. The structures and energetics of the network can explain the physical properties of the substance on macroscopic length scales, but the events that initiate many chemical reactions in water occur on the time scales of [similar to] 0.1 - 1 pico

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Shrestha, Sweta. "Photochemical Water Oxidation by Zeolite-supported Manganese Oxides." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408983765.

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