Bioavailability, Bioaccessibility and Mobility of Environmental Contaminants

About this book

This book covers all aspects of bioavailability, as related to environmental contaminants. After a discussion of the definition of bioavailability and its context, focus is placed on the role of risk assessment and bioavailability. Methods of analysis are then discussed including a range of atomic spectroscopic and electrochemical techniques for metal analysis and chromatographic approaches for persistent organic pollutants (POPs). The occurrence, properties and eco-toxicity of POPs and metals in the soil/sediment environment are discussed. Particular emphasis is placed on the uptake of POPs and metals by plants (phytoextraction).

Examples of POPs and metals in the environment are reviewed. Methods to assess the bioavailability of POPs and metals in the environment are discussed. The particular approaches considered are: non-exhaustive extraction techniques; single extraction techniques; sequential extraction techniques; use of cyclodextrin and surfactants; in-vitro gastrointestinal methods including physiological-based extraction test; and the use of bioasssays including earthworms. Finally, selected case studies highlight the importance of determining the bioavailability of POPs and metals.

Contents

Preface.Series Preface.Glossary of Terms.1.0 Contaminated land and the link to human health.1.1 Introduction.1.2 Soil Guideline Values.1.3 Risk to humans.1.4 An approach to assess contaminated soils relative to soil guidelines values.1.4.1 Mean value test.1.4.2 Maximum value test.1.5 Summary.1.6 References.2.0 Sample preparation and analytical techniques for elemental analysis of environmental contaminants.2.1 Introduction.2.2 Sample preparation for elemental analysis.2.2.1 Solid samples.2.2.2 Liquid samples.2.3 Atomic absorption spectroscopy.2.4 Atomic Emission Spectroscopy.2.5 Inorganic Mass Spectrometry.2.5.1 Interferences in ICP-MS.2.6 X-ray fluorescence spectroscopy.2.7 Electrochemistry.2.8 Hyphenated Techniques.2.9 Comparison of elemental analytical techniques.2.10 Selected resources on elemental analytical techniques.2.10.1 Specific books on atomic spectroscopy.2.10.2 Specific books on electroanalytical techniques.2.11 Summary. 3.0 Sample preparation and analytical techniques for persistent organic pollutant analysis of environmental contaminants. 3.1 Introduction.3.2 Sample preparation for persistent organic pollutant analysis.3.2.1 Solid samples.3.2.2 Liquid samples.3.3 Gas chromatography.3.4 High performance liquid chromatography.3.5 Interfacing chromatography and mass spectrometry.3.6 Comparison of persistent organic pollutant analytical techniques.3.7 Selected resources on persistent organic pollutant techniques.3.7.1 Specific books on chromatography. 3.8 Summary.4.0 Methods used to assess bioavailability of metals.4.1 Non-exhaustive extraction techniques for metals.4.2 Single extraction methods for metals.4.3 Sequential extraction techniques for metals.4.4 Earthworms.4.4.1Earthworms in bioavailability studies.4.4.2 Chemical - extraction methods to estimate bioavailability of metals by earthworms.4.5 Plant uptake.4.6 Certified Reference Materials.4.7 Summary.4.8 References.5.0 Methods used to assess bioavailability of persistent organic pollutants.5.1 Introduction.5.2 Non-exhaustive extraction techniques for POPs.5.2.1 Selective or mild-solvent extraction.5.2.2 Cyclodextrin extraction.5.2.3 Supercritical fluid extraction.5.2.4 Other approaches.5.3 Earthworm studies.5.3.1 Chemical - extraction methods to estimate bioavailability of POPs by earthworms.5.4 Plant uptake.5.5 Summary.5.6 References.6.0 Methods used to assess bioaccessibility.6.1 Introduction.6.2 Introduction to human physiology.6.3 Considerations in the design and development of a simulated in vitro gastrointestinal extraction method.6.4 Approaches to assess bioaccessibility of metals.6.5 Approaches to assess bioaccessibility of persistent organic pollutants.6.6 Validity for measuring bioaccessibility.6.7 Summary.6.8 References.7.0 Selected case studies on bioavailability, bioaccessibility and mobility of environmental contaminants.7.1 Bioavailability of metals by plants.7.1.1 Background.7.1.2 Experimental.7.1.3 Results and Discussion.7.1.4 Conclusion.7.1.5 References.7.2 Bioaccessibility of metals from plants.7.2.1 Background.7.2.2 Experimental.7.2.3 Results and Discussion.7.2.4 Conclusion.7.3 Bioavailability of POPs by plants.7.3.1 Background.7.3.2 Experimental.7.3.3 Results and Discussion.7.3.4 Conclusion.7.4 Bioaccessibility of POPs from plants.7.4.1 Background.7.4.2 Experimental.7.4.3 Results and Discussion.7.4.4 Conclusion.8.0 Recording of information in the laboratory and other selected resources.8.1 Safety.8.2 Recording of information.8.3 Selected other resources.

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Biography

John R. Dean took his first degree in Chemistry at UMIST, followed by an M.Sc. in Analytical Chemistry & Instrumentation at Loughborough University of Technology and finally a Ph.D. and D.I.C. in Physical Chemistry at Imperial College. He then spent 2 years as a postdoctoral research fellow at the Food Science Laboratory of M.A.F.F. in Norwich in conjunction with Polytechnic South West in Plymouth. The work focused on the development of directly coupled high performance liquid chromatography inductively coupled plasma mass spectrometry methods for trace element speciation in foodstuffs. This was followed by a temporary lectureship in Inorganic Chemistry at Huddersfield Polytechnic. In 1988 he was appointed to a lectureship in Inorganic/Analytical Chemistry at Newcastle Polytechnic (now Northumbria University). This was followed by promotion to Senior Lecturer (1990), Reader (1994) and Principal Lecturer (1998). In 1998 he was awarded a D.Sc. (London) in Analytical & Environmental Science and was the recipient of the 23rd SAC Silver Medal in 1995. He has published extensively in analytical and environmental science. He is an active member of the Royal Society of Chemistry Analytical Division having served as a member of the atomic spectroscopy group for 15 years (10 as honorary secretary), as well as a past chairman (1997-99). He has served on Analytical Division council for three terms and is currently its vice-president (2002-04) as well as chairman of the North East Region (2001-03).