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Dissertations / Theses on the topic 'Hazardous chemicals'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Chan, Wai-man. "The control and management of dangerous substances and chemicals in Hong Kong /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19945711.

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2

Barrios, Paula. "Liberal environmentalism and the international law of hazardous chemicals." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/354.

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This study looks at the role that liberal economic norms are playing in international environmental negotiations on hazardous chemicals (including wastes), and the implications of these norms for the protection of the environment and human health from the thousands of chemicals on the market. The key trait of liberal economic norms in relation to global environmental governance is their assumption that the liberalisation of trade and finance and economic growth are both consistent with and necessary for environmental protection. From this assumption follows, for instance, the idea that states

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3

Lycett, James Edward. "Knowledge based systems for decision support in emergency situations." Thesis, Teesside University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358745.

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4

Graham, William Robert. "Guidelines for the safe handling of hazardous chemicals, a collaborative approach." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0001/MQ41804.pdf.

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5

Petrie, Bruce. "Enhancing the removal of a diverse range of hazardous chemicals from wastewaters." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/8506.

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Due to increasingly stringent legislation covering the discharge of hazardous chemicals into the environment, existing wastewater treatment processes need to be upgraded for their removal. This thesis explores the removal of a diverse range of hazardous chemicals during secondary wastewater treatment with the overall aim of enhancing their removal simultaneously by activated sludge. Previous research in this field has made the broad comparison of full-scale activated sludge plants (ASPs) which receive varying influent sewage compositions and flow. Consequently, assessing the direct impact of p

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6

Kassam, Zara. "Degradation of polypropylene and novel blend formulations, and the release of hazardous chemicals." Thesis, Kingston University, 2017. http://eprints.kingston.ac.uk/39247/.

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7

Opdyke, Daniel Robert. "Probabilistic groundwater transport of chemicals under non-equilibrium sorption conditions /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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8

Benn, Suzanne Harriette Science &amp Technology Studies UNSW. "The Environmental Challenge to the Overloaded State: The Politics of Toxic Chemicals in NSW since the late 1970s." Awarded by:University of New South Wales. Science and Technology Studies, 1999. http://handle.unsw.edu.au/1959.4/32639.

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This thesis is a regional interdisciplinary analysis of the environmental challenge to the liberal democratic state. It situates these new problems of governance in one of the dominating political conflicts of our time, the battle between market and state for the 'commanding heights'. By the end of the 1970s, environmental concerns had added to the social crises associated with the overloaded, welfare state. The study sets the political context through an exposition of the perceived problems of the overloaded state, analysed by neo-Marxist theorists in terms of rationality and legitimacy de

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9

Chia, Valerie Jing-chi. "Life-cycle analysis of hazardous chemicals in the Department of Materials Science & Engineering." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81139.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 29).<br>MIT policies set forth by the Department of Environment, Health, and Safety (EHS) require that all laboratories maintain a chemical inventory to properly document the use of hazardous chemicals. While EHS has provided a chemical inventory management tool called ChemTracker to help labs to do so, it is estimated that less than 20% of laboratories utilize the software. As a result, an EHS committee has

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10

Walsh, Wendy. "Hazardous substances legislation in the educational environment : strategies for compliance." Thesis, Queensland University of Technology, 1997.

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The Queensland Workplace Health and Safety Act 1995, Regulation,Compliance Standards and Advisory Standards provide a framework for improving levels of workplace health and safety. The Act outlines particular health and safety obligations placed on all members of the workforce. In 1995, the Workplace Health and Safety (Hazardous Substances) Compliance Standard was released. This compliance standard was based on National Model Regulations for Hazardous Substances. This legally binding compliance standard has prompted the Department of Education, Queensland to begin appraising its position in

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11

Romero, HernaÌndez Omar. "Integrated approach to determine an optimal degree of wastewater pollution abatement in process industries." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313693.

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12

Klöber, Wolfram. "Risikomanagement im Chemikalienrecht : ein Rechtsvergleich des US-amerikanischen Toxic Substances Control Act und des deutschen Chemikaliengesetzes /." Hamburg : Kovač, 2003. http://www.gbv.de/dms/spk/sbb/recht/toc/362362866.pdf.

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13

Chan, Wai-man, and 陳偉文. "The control and management of dangerous substances and chemicals in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31253945.

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14

Molander, Linda. "Chemicals in consumer products : Towards a safe and sustainable use." Licentiate thesis, KTH, Filosofi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104826.

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Health and environmental risks associated with emissions of hazardous chemicals from articles, including everyday consumer products such as clothes and toys, have become widely acknowledged internationally, particularly in the EU. This thesis contributes to new understandings of how these risks are currently managed within the EU and recommends actions for ensuring a safe and sustainable use of chemicals in articles. Paper I provides an overview and comparative analysis of regulatory strategies for managing risks of chemicals in articles in the EU. The in-depth analysis, which is focused on th

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15

Labunska, Iryna. "Environmental contamination and human exposure to PBDEs and other hazardous chemicals arising from informal e-waste handling." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7549/.

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A method was developed and validated for GC/MS analysis of PBDEs in a variety of matrices (soil, dust, sediment, and 10 types of foodstuffs), represented by a total of 313 samples. Extensive environmental contamination by PBDEs is shown to arise as a result of improper e-waste handling in Guiyu, China, with open burning and circuit boards shredding operations identified as the most significant sources of PBDEs to soil and sediment. Elevated concentrations of selected key pollutants, including legacy and novel brominated flame retardants (NBFRs), polychlorinated biphenyls (PCBs), and metals/met

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16

Abussaud, Basim Ahmed. "Wet air oxidation of benzene." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103362.

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Processing of petrochemical compounds produces a large amount of wastewater. This wastewater consists of toxic (hazardous) materials that can not be discharged to the environment without treatment. As restrictive environmental constraints increase, new technologies are needed to treat those toxic materials before discharging them to the environment. Wet Air Oxidation (WAO) is one of these new methods.<br>This study casts light on the effect of initial pH on the WAO of benzene at different temperatures and pressures. It was found that at pH 6, a temperature of 260°C and a partial pressure of ox

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17

Ching, Hei-wai, and 程琋瑋. "A review on e-waste management and an analysis of human exposure to hazardous chemicals due to informal e-waste processing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48543020.

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This study compares the procedures of formal and informal e-waste recycling; and investigates the relationship between informal e-waste recycling and the health of residents living near the recycling facilities. The informal e-waste recycling facilities are mainly located in developing countries and are operated by illegally receiving e-waste from developed countries. In these informal recycling businesses, the procedures are raw and crude without any measures in pollution control and state-of-the-art technologies, suggesting the health of the workers and residents living nearby are at risk.

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18

Kaup, Aleš. "Modelování následků chemických havárií." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-232928.

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Nowadays the number of produced chemicals is increasing very rapidly. However, technological processes are gradually improving and safety of handling chemicals is increasing. Unfortunately, even today, chemical accidents can happen. To alleviate results or to prepare for protection of humans, extensive knowledge is necessary to estimate the course of a chemical accident. One of the means of accident mitigation are modern modelling programs that will help us to clarify the implications and consequences of the course of chemical accidents. Based on the results of such modelling, different organi

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19

Eriksson, Sara. "Laboratory adjustment to the new regulation on classification, labeling and packaging of substances and mixtures." Thesis, Uppsala universitet, Institutionen för kvinnors och barns hälsa, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-204661.

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The United Nations has, during many years, developed a model for a globally harmonized system for classification and labeling of chemicals, with the aim of it becoming a global standard. This system is implemented in the European Union through the CLP-regulation and is now working parallel to the existing directives until 1st of June 2015, when all the new classifications of substances and mixtures must be completed. The aim of this project was to adjust the laboratory to the new legislation, through inventory of stored chemicals, update the list of chemicals and perform self-classifications o

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20

Lind, Patrik. "Gemensamma åtgärder i harmoni? : En beskrivande fallstudie av regional miljöpolitisk koordination mellan nationell och internationell nivå." Thesis, Södertörn University College, School of Social Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-2264.

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<p> </p><p>The aim and scope of this study is to describe the coordination of joint efforts concerning chemicals and hazardous substances in the Baltic Sea region, between the Swedish Chemicals Agency (KemI) and the land-based pollution group of the Helsinki Commission (HELCOM LAND). Based on the description of the coordination, the second aim is to discuss the consequences for the Swedish Chemicals Agency in its policy shaping work towards a nontoxic environment. A qualitative and descriptive case study method is used for this purpose. Theories of coordination and achievement-inducing criteri

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21

Claeson, Anna-Sara. "Volatile organic compounds from microorganisms : identification and health effects." Doctoral thesis, Umeå : Univ, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-880.

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22

Černá, Monika. "Posouzení zdrojů environmentálního rizika v průmyslovém podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318527.

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This diploma thesis is focused on evaluating the sources of environmental risks in the safety domain of the Honeywell Aerospace Olomouc company. First part of the diploma thesis is theoretical and serves as an entry to problematics of severe accidents prevention, risks identification and assessment. In the next part all the chemical substances stored in this international industrial company are valorised, the substances most dangerous to the environment are identified and certain precautions to prevent serious accidents are suggested according to valid legislation and recommended methods of th

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23

Lima, Ivo Costa de. "Gerenciamento de resíduos químicos de laboratórios: estudo de caso do Instituto de Química da Universidade do Estado do Rio de Janeiro." Universidade do Estado do Rio de Janeiro, 2012. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=4050.

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Instituições de Ensino e Pesquisa possuem um papel fundamental na formação de seus profissionais considerando a ciência, tecnologia e o conhecimento que afetam toda a sociedade. A falta de um programa de gestão de resíduos, na maioria das instituições de ensino e pesquisa do país, tem levado, com certa frequência, a um descarte pouco responsável dos materiais residuais no ambiente, através das pias dos laboratórios ou do lixo comum, ou em muitos casos, resultando na geração de passivos ambientais acumulados precariamente por longo tempo à espera de um eventual tratamento. Entretanto, essas Ins

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24

Budde, Eva. "Assessment and optimisation of biological and physico-chemical techniques to monitor natural attenuation : application to three field sites." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=153281.

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Monitored natural attenuation is a cost-effective remediation strategy for the risk reduction of chemicals of concern (CoCs) in contaminated land and waters. This study considers three genuine sites in Germany, undergoing remediation. The objective was to measure a suite of physicochemical and biological parameters, and characterise the sites based on these data. The sites differed by their prevalent type of CoC, with one site impacted by polycyclic aromatic hydrocarbons (PAH), and two sites, situated in Hilden, impacted by BTEX. Sampling of microorganisms was performed using the industrial pa

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25

Lee, Tai-Gyu. "Modeling of hazardous waste incinerator : failure diagnostic and staged combustion." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/35447.

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26

Holánová, Iveta. "Detekce a laboratorní kontrola úniků nebezpečných chemických látek do životního prostředí s nutností výjezdu chemické laboratoře HZS." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-232723.

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The diploma thesis is focused on a detection and a laboratory control of hazardous substances’ leak into the environment. These hazardous substances are classified. Further, it aims to chemical laboratories of the fire-brigade of the Czech Republic, as well as which place they hold in the fire-brigade system, and it indicates their main duties. This diploma thesis contains a review of some essential types of devices and mediums, which are in terms of the fire-brigade of the Czech Republic usable to practice the detection, determination and assessment of the hazardous substances in various figu

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27

Kwok, Hon-chiu. "An overview of chemical waste management of printed circuit board manufacturing in Hong Kong /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17457348.

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28

Heino, Perttu. "Fluid property reasoning in knowledge-based hazard identification /." Espoo [Finland] : Technical Research Centre of Finland, 1999. http://www.vtt.fi/inf/pdf/publications/1999/P393.pdf.

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29

Al-Atta, Ammar Jaber. "Supercritical water oxidation of hazardous waste : process enhancement and reactor design." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/53356/.

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The work presented in this thesis is focused on two specific areas of supercritical water oxidation (SCWO). Firstly, the design and testing of an innovative anticorrosive reactor design that can be used for the SCWO of hazardous organic waste. Secondly, exploiting the merits of counter current mixing reactor in combining two processes; Supercritical water oxidation (SCWO) and supercritical water hydrothermal synthesis (SCWHS) in one reactor. In Chapter 1, an introduction to supercritical fluid and supercritical water oxidation is given, followed by a brief account of the main problems associat

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30

Hildebrandt, Leslie M. "Control guidelines for the transportation of chemically contaminated dry vacuum pumps." Online version, 1998. http://www.uwstout.edu/lib/thesis/1998/1998hildebrandtl.pdf.

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31

Apperley, Sarah Ann. "Attitude dimensions and behavioural response towards the issue of environmental impact of domestic chemical products." Thesis, University of Huddersfield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274234.

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32

Hill, Stephanie R. "Evaluation of seed and seedling response to aid revegetation of hazardous chemical waste sites." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/40671.

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The response of several plant species to heavy metal contaminated soils was evaluated using plant bioassays with a soil substrate. A natural soil was collected from Dinwiddie County, Virginia and soil analysis was performed. The plant species, Lolium multiflorum, setaria italica and Trifolium rep ens latum, Robinia pseudoacacia, Andropogon gerardi, Asclepias syriaca, Echinacea purpurea, Rudbeckia hirta and Festuca rubra were grown in to determine the response to cupric and cadmium chloride in soils (mg Cu/kg soil). A few plant species were grown in small pots in a plant growth chambe

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33

Bunn, Adrian R. "A study of the design expertise for plants handling hazardous materials." Thesis, Loughborough University, 1987. https://dspace.lboro.ac.uk/2134/7503.

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34

Nagel, Christopher John. "Identification of hazards in chemical process systems." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13952.

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35

Bevin, Anna, An Na Lay, Daniel Ullmark, and Jessika Hagman. "Chemical analysis of hazardous substances in permanent tattoo inks available on the market." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277104.

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As permanent tattoos are becoming more popular and common, an increased number of allergic reactions to tattoos is reported. The purpose of this project was to analyze tattoo inks for hazardous substances, and whether they comply to current Swedish and European legislative requirements. The tattoo inks were qualitatively analyzed for pigments, and quantitatively analyzed for metals. A total of 73 tattoo inks were collected from various sources such as a tattoo ink supplier, online retailers, and provided directly from tattoo artists. The labels of each tattoo ink bottle were inspected to inves

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36

London, Leslie. "The health hazards of chemical use in agriculture." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/27007.

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Photocopies of journal articles. * Agrichemical safety practices on farms in the Western Cape. London L. SA Med J 1994 ; 84 : 273-278. * Notification of pesticide poisoning in the Western Cape 1987 - 1991. London L, Ehrlich R, Rafudien S, Krige F, Vurgarellis P. SA Med J 1994 ; 84 : 269-272. * Critical Issues in agrichemical safety in South Africa. London L, Myers JE. Am J Ind Med 1995 ; 27(1) : 1-14. * Repeatability and validity of a field kit for estimation of cholinesterase in whole blood. London L, Thomson ML, Sacks S, Fuller B, Bachmann OM, Myers JE. Occupational and Environment

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37

Medcalf, Bradley D. "The chemchar gasification process : theory, experiment, and design developments /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901263.

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38

Steinbach, Paul B. "An electrothermal fluidized-bed carbon-particle plasma reactor for hazardous waste treatment /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9823315.

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39

Aldeeb, Abdulrehman Ahmed. "Systematic approach for chemical reactivity evaluation." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/159.

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Under certain conditions, reactive chemicals may proceed into uncontrolled chemical reaction pathways with rapid and significant increases in temperature, pressure, and/or gas evolution. Reactive chemicals have been involved in many industrial incidents, and have harmed people, property, and the environment. Evaluation of reactive chemical hazards is critical to design and operate safer chemical plant processes. Much effort is needed for experimental techniques, mainly calorimetric analysis, to measure thermal reactivity of chemical systems. Studying all the various reaction pathways exper

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40

Cronin, J. L. "A strategy for thermal hazards analysis in batch chemical manufacture." Thesis, London South Bank University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375477.

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41

Howard, Patricia Ann. "Analysis of mesh strategies for rapid source location in chemical/biological attacks." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0430104-144332.

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42

Lama, Audrey. "Interactive Wireless Sensor for Remote Trace Detection and Recognition of Hazardous Gases." TopSCHOLAR®, 2013. http://digitalcommons.wku.edu/theses/1308.

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The interactive wireless sensor detects many hazardous gases such as Hexane, Propane, Carbon monoxide and Hydrogen. These gases are highly toxic and used in different kinds of manufacturing industries, domestic purpose and so on. So, building a sensor that can detect this kind of gases can save the environment; prevent the potential for explosion, and endangering human life. In long term, interactive wireless sensor can also prevent the financial losses that might occur due to the hazardous incident that might occur due to these toxic gases. Hexane is a colorless, strong gas which inhaled in s

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43

Brookes, Jodi. "Biological and chemical hazards in water-mix metalworking fluids and mists." Thesis, Sheffield Hallam University, 2017. http://shura.shu.ac.uk/21507/.

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Background: Occupational exposure to used metalworking fluid (MWF) mists is a risk factor in the development of allergic and irritant respiratory disease. Respiratory disease "outbreaks" have prompted further investigation into possible causative factors. These might include sensitizing agents accumulating in used MWF. However, there is no clear evidence that shows whether levels of biologicals and chemicals detected within the sump are representative of what is found in the mist. Method: Samples of used MWF and mist samples were obtained from UK sites. Analysis of biological contaminants was

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44

Johansson, Felicia. "Evaluation of per and polyfluoroalkyl substances (PFASs) and extractable organic fluorine (EOF) in composite wastewater samples from a hazardous waste management facility." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-86100.

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Per- and polyfluoroalkyl substances (PFASs) have been used broadly in industries, firefighting foams, surfactant materials and consumer products. These compounds are very resistant to degradation in the environment and high exposure to these compounds may cause health issues such as cancer and immunosuppression. Many of the consumer products will end up as waste and later end up in landfills where the leachate will be contaminated by these compounds. The leachate can be dispersed to the surrounding environment, and it is therefore necessary to investigate and reduce the concentrations of PFAS

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45

Viljoen, Liandi. "Comparison of South African occupational exposure limits for hazardous chemical substances with those of other countries / Liandi Viljoen." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8640.

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Various hazardous chemical substances are used daily as part of manufacturing and processing. Exposure to these hazardous chemical substances (HCSs) can cause adverse health effects in the exposed workers. Occupational exposure limits (OELs) are used to control exposure to these HCSs and thereby protect workers from the adverse effects that exposure may induce. The aim of this study was to compare South African list of OELs as contained in the Hazardous Chemical Substance Regulations (HCSR) to several developed and developing countries based on two aspects: (1) the number of substances that ar

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46

Bella, Françoise. "Les choses dangereuses dans les contrats privés." Thesis, Versailles-St Quentin en Yvelines, 2015. http://www.theses.fr/2015VERS007S/document.

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Un simple regard porté sur la vie quotidienne suffit pour prendre conscience autant de la diversité des contrats que de la multitude des choses dangereuses qui nous entoure. La diversité contractuelle qui apparaît clairement dans le Code Civil et plus largement dans le droit civil, s’est aussi développée dans le droit commercial et plus amplement dans le droit des affaires. Quant aux choses dangereuses, comme souvent évoquée par la doctrine, elles sont de plus en plus considérées comme étant omniprésentes dans la société contemporaine. Les choses dangereuses peuvent être l’objet de tous les co

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47

Amsterdam, Heinrich Francois. "The use of Monte Carlo simulation to quantify the uncertainty in modeled estimates of toxic, radiation and overpressure impacts resulting from accidents in large chemical plants." Thesis, Peninsula Technikon, 2004. http://hdl.handle.net/20.500.11838/893.

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Thesis (MTech (Chemical Engineering))--Peninsula Technikon, Cape Town, 2004<br>Current Risk Assessment procedures for the estimation of the acute health impacts resulting from the accidental release of toxic chemicals into the atmosphere involve the definition or construction of a representative accidental release scenario and the use of one or other air quality or dispersion model to estimate ambient air concentrations and exposure durations in the vicinity of the source. Legislation such as the South African Occupational Health and Safety Act, 1993, Major Hazard Installation Regula

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48

Vaughan, N. P. "Methods for the assessment of dust hazards in metal processing industries." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372576.

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49

Grissom, Tyler Glenn. "Fundamental Investigations of Hazardous Gas Uptake and Binding in Metal-Organic Frameworks and Polyurethane Films." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/101079.

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The advancements of chemists, engineers, and material scientists has yielded an enormous and diverse library of high-performance materials with varying chemical and physical properties that can be used in a wide array of applications. A molecular-level understanding of the nature of gas–surface interactions is critical to the development of next generation materials for applications such as gas storage and separation, chemical sensing, catalysis, energy conversion, and protective coatings. Quartz crystal microbalance (QCM) and in situ infrared (IR) spectroscopic techniques were employed to pro

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50

Mamabolo, Mankabidi Cuthbert. "Effects of TDS and Br on the accumulation of water-borne potentially hazardous chemical constituents As en Pb in broilers." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-06112009-141112.

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