SEGH Events

7th International Workshop on Chemical Bioavailability

04 November 2013
British Geological Survey, Nottingham, UK
The 7th IWCB is a premier event for highlighting research in chemical bioavailability in the environment.

On behalf of the International Organising Committee, the British Geological Survey (BGS) and the University of Nottingham invite everyone to discuss and exchange new and emerging scientific breakthroughs in chemical bioavailability at the 7th International Workshop on Chemical Bioavailability (IWCB). This series is emerging as a premier event for highlighting research in chemical bioavailability in the environment.  We hope that the workshop will provide the opportunity for delegates to exchange knowledge and experience and to further develop a common view on contaminant bioavailability.

Why attend?

  • network with leading figures in the field
  • visit the exhibition to discover new products and services to enhance your research

Call for papers

We invite you to submit an abstract for an oral or poster presentation.  Please use the template on our webpage and send your completed submission to



  • analytical methodologies
  • models - QSAR for organic bioaccessibility, predictive, spatial, soil properties
  • reference materials
  • case studies on risk based land management
  • microbial bioavailability
  • essential nutrients
  • risk assessment and communication
  • plant uptake
  • chemomimetics
  • sentinel species
  • nano-materials
  • oral, inhalation and dermal pathways


Dr Mark Cave, British Geological Survey

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Science in the News

Latest on-line papers from the SEGH journal: Environmental Geochemistry and Health

  • Influence of clay minerals on sorption and bioreduction of arsenic under anoxic conditions 2015-12-01


    Adsorption of As(V) on various clay minerals including kaolinite (KGa-1), montmorillonite (SWy-1) and nontronites (NAU-1 and NAU-2), and subsequent bioreduction of sorbed As(V) to As(III) by bacterium Shewanella putrefaciens strain CN-32 were investigated. Nontronites showed relatively higher sorption capacity for As(V) primarily due to higher iron oxide content. Freundlich equation well described the sorption of As(V) on NAU-1, NAU-2 and SWy-1, while As(V) sorption isotherm with KGa-1 fitted well in the Langmuir model. The bacterium rapidly reduced 50 % of dissolved As(V) to As(III) in 2 h, followed by its complete reduction (>ca. 98 %) within 12 h. In contrast, sorption of As(V) to the mineral surfaces interferes with the activity of bacterium, resulting in low bioreduction of As(V) by 27 % for 5 days of incubation. S. putrefaciens also promoted the reduction of Fe(III) present in the clay mineral to Fe(II). This study indicates that the sorption and subsequent bioreduction of As(V) on clay minerals can significantly influence the mobility of As(V) in subsurface environment.

  • Determination of biomarkers for polycyclic aromatic hydrocarbons (PAHs) toxicity to earthworm ( Eisenia fetida ) 2015-12-01


    Polycyclic aromatic hydrocarbon (PAH) compounds are persistent, carcinogenic, and mutagenic. When PAHs enter agricultural soils through sewage sludge, they pose an environmental risk to soil organisms, including earthworms. Therefore, we aimed to determine the toxic effects of PAHs on earthworms. Five PAHs were used: fluorene, anthracene, phenanthrene, fluoranthene, and pyrene. Only fluorene and phenanthrene exhibited toxicity (LC50 values 394.09 and 114.02 g L−1, respectively) against the earthworm Eisenia fetida. None of the other PAHs tested in this study enhanced the mortality of adult earthworm until the concentrations reached to 1000 g L−1. After exposure to PAHs, acetylcholinesterase (AChE) activity in E. fetida decreased in a concentration-dependent manner, and phenanthrene exhibited the strongest inhibitory effect on AChE, followed by fluorene. Activity of a representative detoxifying enzyme, carboxylesterase, was dramatically reduced in E. fetida exposed to all tested PAHs in comparison with that observed in the control test. The remaining glutathione S-transferase activity significantly decreased in E. fetida after exposure to PAHs. To profile small proteins <20 kDa, SELDI-TOF MS with Q10 ProteinChips was used, and 54 proteins were identified as being significantly different from the control (p = 0.05). Among them, the expressions of three proteins at 4501.8, 4712.4, and 4747.9 m/z were only enhanced in E. fetida exposed to anthracene and pyrene. One protein with 16,174 m/z was selectively expressed in E. fetida exposed to fluorene, phenanthrene, and fluoranthene. These proteins may be potential biomarkers for the five PAHs tested in E. fetida.

  • Can abundance of methanogen be a good indicator for CH 4 flux in soil ecosystems? 2015-12-01


    Methane, which is produced by methanogenic archaea, is the second most abundant carbon compound in the atmosphere. Due to its strong radiative forcing, many studies have been conducted to determine its sources, budget, and dynamics. However, a mechanistic model of methane flux has not been developed thus far. In this study, we attempt to examine the relevance of the abundance of methanogen as a biological indicator of methane flux in three different types of soil ecosystems: permafrost, rice paddy, and mountainous wetland. We measured the annual average methane flux and abundance of methanogen in the soil ecosystems in situ. The correlation between methane flux and the abundance of methanogen exists only under a specific biogeochemical conditions such as SOM of higher than 60 %, pH of 5.6–6.4, and water-saturated. Except for these conditions, significant correlations were absent. Therefore, microbial abundance information can be applied to a methane flux model selectively depending on the biogeochemical properties of the soil ecosystem.