SEGH Articles

32nd International SEGH conference, Brussels 2016

17 November 2015
32nd International SEGH conference, Universite Libre de Bruxelles, Brussels, Belgium, 4th-8th July, 2016.

Dear All,

On behalf of the Organising Committee of the 32nd International SEGH conference, I would like to invite you to join us at the Universite Libre de Bruxelles, Brussels, Belgium, 4th-8th July, 2016. http://segh-brussels.sciencesconf.org

This annual conference of the Society for Environmental Geochemistry and Health provides a forum for international scientists, consultants, regulatory authorities and other practitioners (public health / environmental health) with an interest in the links between environment and health and working in the broad area of environmental geochemistry. For the 32nd SEGH we are keen to receive contributions on three core themes and three special sessions:

• Theme 1 – Dust and Aerosol: Environmental records of Anthropogenic

• Theme 2 – Isotopes and Speciation

• Theme 3 – Geochemistry and Health

• Special Session 1 – SpatioTemporal Trends of Metal Contaminants in the Atmosphere

• Special Session 2 – Nanoparticles in the Environment: Fate and Effects

• Special Session 3 – Geochemistry and Biomedical Issues

The conference venue is the city campus of Université Libre de Bruxelles, in the heart of the city of Brussels, Belgium, will offer you the opportunity to visit an amazing cultural heritage, rich in European History, to taste a fascinating cuisine (chocolates, beers, ...), and participate to the Belgian life style. The venue takes benefit of accessibilities from much of the world, and numerous good-quality affordable accommodations.

My research Lab, Laboratoire G-Time (http://gtime.ulb.ac.be/ ), will be very happy to welcome you and offer you the opportunity to visit our analytical facilities. Our research focuses on applications of radiogenic and non-traditional stable isotopes in geosciences (Environmental Geochemistry, Mantle Geodynamics and Cosmochemistry). My main research interest is dedicated to the Biogeochemistry of Metal Trace Elements in the Environment. The core of our work remains the applications of non-traditional stable isotopes (Zn, Cd, Cu, Fe) in addition to traditional radiogenic isotopes (Pb, Hf, Nd, ...), as tracers of sources and processes of global biogeochemical cycles, environmental pollution and paleo-environmental reconstruction.

Activities and Climate Changes

Tracing Transfer Processes in the Critical Zone

Young scientist contributions are especially encouraged and special awards will be given out by the SEGH for the best poster and talk.

Please save these key dates in your diary. More information will follow...

We look forward to welcoming you to Brussels in 2016.

Best Regards,

Nadine Mattielli [SEGH 2016 Chair]

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

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    Abstract

    The fate and persistence of trace metals in soils and sludge from landfill sites are crucial in determining the hazard posed by landfill, techniques for their restoration and potential reuse purposes of landfill sites after closure and restoration. A modified European Community Bureau of Reference’s (BCR) sequential extraction procedure was applied for partitioning and evaluating the mobility and persistence of trace metals (As, Cd, Cr, Cu, Ni, Pb, Sb, Se, Zn) in soils from three landfill sites and sludge sample from Cape Town, South Africa. Inductively coupled plasma optical emission spectroscopy was used to analyze BCR extracts. The mobility sequence based on the BCR mobile fraction showed that Cu (74–87%), Pb (65–80%), Zn (59–82%) and Cd (55–66%) constituted the mobile metals in the soils from the three sites. The mobility of Cu, Zn and Ni (> 95%) was particularly high in the sludge sample, which showed significant enrichment compared to the soil samples. Geo-accumulation index (Igeo) and risk assessment code were used to further assess the environmental risk of the metals in the soils. Exposure to the soils and sludge did not pose any non-cancer risks to adult and children as the hazard quotient and hazard index values were all below the safe level of 1. The cancer risks from Cd, Cr and Ni require that remedial action be considered during closure and restoration of the landfill sites.

  • An investigation into the use of < 38 µm fraction as a proxy for < 10 µm road dust particles 2019-06-13

    Abstract

    It is well documented that a large portion of urban particulate matters is derived from road dust. Isolating particles of RD which are small enough to be inhaled, however, is a difficult process. In this study, it is shown for the first time that the < 38 µm fraction of road dust particles can be used as a proxy for road dust particles < 10 µm in bioaccessibility studies. This study probed similarities between the < 10 and < 38µm fractions of urban road dust to show that the larger of the two can be used for analysis for which larger sample masses are required, as is the case with in vitro analysis. Road dust, initially segregated to size < 38 µm using sieves, was again size segregated to < 10 µm using water deposition. Both the original < 38 µm and the separated < 10 µm fractions were then subject to single particle analysis by SEM–EDX and bulk analysis by ICP-OES for its elemental composition. Dissolution tests in artificial lysosomal fluid, representative of lung fluid, were carried out on both samples to determine % bioaccessibility of selected potentially harmful elements and thus probe similarities/differences in in vitro behaviour between the two fractions. The separation technique achieved 94.3% of particles < 10 µm in terms of number of particles (the original sample contained 90.4% as determined by SEM–EDX). Acid-soluble metal concentration results indicated differences between the samples. However, when manipulated to negate the input of Si, SEM–EDX data showed general similarities in metal concentrations. Dissolution testing results indicated similar behaviour between the two samples in a simulated biological fluid.

  • Degradation of petroleum hydrocarbons in unsaturated soil and effects on subsequent biodegradation by potassium permanganate 2019-06-13

    Abstract

    To date, the oxidation of petroleum hydrocarbons using permanganate has been investigated rarely. Only a few studies on the remediation of unsaturated soil using permanganate can be found in the literature. This is, to the best of our knowledge, the first study conducted using permanganate pretreatment to degrade petroleum hydrocarbons in unsaturated soil in combination with subsequent bioaugmentation. The pretreatment of diesel-contaminated unsaturated soil with 0.5-pore-volume (5%) potassium permanganate (PP) by solution pouring and foam spraying (with a surfactant) achieved the total petroleum hydrocarbon (TPH) removal efficiencies of 37% and 72.1%, respectively. The PP foam, when coupled with bioaugmentation foam, further degraded the TPH to a final concentration of 438 mg/kg (92.1% total reduction). The experiment was conducted without soil mixing or disturbance. The relatively high TPH removal efficiency achieved by the PP–bioaugmentation serial foam application may be attributed to an increase in soil pH caused by the PP and effective infiltration of the remediation agent by foaming. The applied PP foam increased the pH of the acidic soil, thus enhancing microbial activity. The first-order biodegradation rate after PP oxidation was calculated to be 0.068 d−1. Furthermore, 94% of the group of relatively persistent hydrocarbons (C18–C22) was removed by PP–bioaugmentation, as verified by chromatogram peaks. Some physicochemical parameters related to contaminant removal efficiency were also evaluated. The results reveal that PP can degrade soil TPH and significantly enhance the biodegradation rate in unsaturated diesel-contaminated soil when combined with bioaugmentation foam.