Microplastics in European sea salts – An example of exposure through consumer choice and of interstudy methodological discrepancies

Microplastics are contaminants of emerging concern, not least due to their global presence in marine surface waters. Unsurprisingly, microplastics have been reported in salts harvested from numerous locations. We extracted microplastics from 13 European sea salts through 30% H2O2 digestion and filtration over 5-µm filters. Filters were visually inspected at magnifications to x100. A subsample of potential microplastics was subjected to Raman spectroscopy. Particle mass was estimated, and human dose exposure calculated. After blank corrections, median concentrations were 466 ± 152 microplastics kg-1 ranging from 74 to 1155 items kg-1. Traditionally harvested salts contained fewer microplastics than most industrially harvested ones (t-test, p < 0.01). Approximately 14 µg of microplastics (< 12 particles) may be absorbed by the human body annually, of which a quarter may derive from a consumer choosing sea salt. We reviewed existing studies, showing that targeting different particle sizes and incomplete filtrations hinder interstudy comparison, indicating the importance of method harmonisation for future studies. Excess salt consumption is detrimental to human health; the hazardousness of ingesting microplastics on the other hand has yet to be shown. A portion of microplastics may enter sea salts through production processes rather than source materials

DNA barcoding reveals a new morphotype of the sugar kelp, Saccharina latissima

Phytoplankton blooms follow predictable annual cycles in the Gulf of Maine, characterized by a large spring bloom and a smaller bloom in the fall. Marine phytoplankton form the foundation of primary production in Gulf of Maine waters, and thus community changes in composition, and abundance could have cascading effects on our coastal ecosystems. We set out to monitor the community composition, diversity, and abundance of the spring micro-phytoplankton bloom, at a Friends of Casco Bay water quality monitoring site, in South Portland, Maine. The Gulf of Maine is experiencing accelerated warming rates, and this type of monitoring can aid in our understanding of what this warming trend may mean for our waters

Microplastics in European sea salts – An example of exposure through consumer choice and of interstudy methodological discrepancies

Microplastics are contaminants of emerging concern, not least due to their global presence in marine surface waters. Unsurprisingly, microplastics have been reported in salts harvested from numerous locations. We extracted microplastics from 13 European sea salts through 30% H2O2 digestion and filtration over 5-µm filters. Filters were visually inspected at magnifications to x100. A subsample of potential microplastics was subjected to Raman spectroscopy. Particle mass was estimated, and human dose exposure calculated. After blank corrections, median concentrations were 466 ± 152 microplastics kg-1 ranging from 74 to 1155 items kg-1. Traditionally harvested salts contained fewer microplastics than most industrially harvested ones (t-test, p < 0.01). Approximately 14 µg of microplastics (< 12 particles) may be absorbed by the human body annually, of which a quarter may derive from a consumer choosing sea salt. We reviewed existing studies, showing that targeting different particle sizes and incomplete filtrations hinder interstudy comparison, indicating the importance of method harmonisation for future studies. Excess salt consumption is detrimental to human health; the hazardousness of ingesting microplastics on the other hand has yet to be shown. A portion of microplastics may enter sea salts through production processes rather than source materials

Respect for nature at 200 km/h? : rally driving in Scotland and environmental responsibility

This thesis explores how rally drivers in Scotland perceive environmental issues and the environments through which they drive. The overarching aim behind this is to think about a group of people who may be more hostile towards questions of environmental responsibility, and look at how such stakeholders reason round their behaviours and perceive environmental issues. I argue that due to the potentially farreaching impacts of contemporary environmental challenges, it is crucial to take seriously the viewpoints and values of those who are perhaps not so willing to engage with environmental issues. The work draws on several bodies of literature. First is work in environmental philosophy on the practical contribution of this sub-discipline, in particular environmental pragmatism. Second is thinking in sociology and human geography on responsibility, especially the interface between responsibility and care. Third is recent material in geography on the body and movement, in particular the burgeoning field of automobility. These issues are addressed through a three-fold research design. Ethnographic and participatory techniques are used to foster an understanding of what exactly ‘the environment’ might mean to rally drivers (and indeed other users of the forest with whom rallying may come into conflict) and how it is experienced. In-depth interviews and subsequent narrative analysis seek to delve further into participants’ narratives and life histories in order to get a handle on how rally driving sits in relation to broader life contexts. Finally, two small-scale participatory projects with rally organisers relating to environmentally-responsible practice look at how this all comes together when participants make practical responses to environmental challenges. The key conclusions arising from the empirical data are that environmental problems are experienced through a range of senses, with different groups using different sensory ‘evidence’ to make claims about environmental damage; that in some cases stakeholders’ views of environmental issues are based on perceived conflict with others as opposed to actual conflict; and that the values activities such as motor sport may represent are just as significant as their physical environmental impacts. In terms of the broader applicability of this research, I suggest two things. Firstly, that one of the key challenges in responding to contemporary environmental issues lies in thinking through how publics link up their everyday practices with much bigger discourses on global environmental change. Secondly, that careful and critical reflection on the rich narratives of place and people, and on the range of emotions shaped by embodied experience, can go some way to explaining why people may persist with more environmentally damaging practices in spite of ethical and environmental criticisms.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Dataset for journal article: Microplastics in European sea salts &ndash; an example of exposure through consumer choice and of interstudy methodological discrepancies

This dataset contains: Data supporting the above mentioned publication can be found in the zip folder &#39;Raw data_Raman spectra files.zip&#39; and the excel file &#39;Raw data_Accompanying file for spectra.xlsx&#39;. The latter file is divided into tabs. Tab &#39;INFO&#39; Provides an overview of information found in the file. Tab &#39;Salt&#39; Contains results from library matching of Raman spectra data of analysed particles from commercial sea salt samples. Tab &#39;Blanks&#39; Contains results from library matching of Raman spectra data of analysed particles from blank samples run alongside commercial sea salt samples. Tab &#39;Packaging&#39; Contains results from library matching of Raman spectra data of analysed particles from the packaging of commercial sea salt samples. Further, the folder &#39;Raw data_images.zip&#39; contains images of potential microplastics that were isolated from commercial sea salt samples. Note: not all of these were identified to be plastic. </span