Skip to navigation Skip to content

High resolution 2D imaging of trace elements in soils by diffusive gradient thin-film (DGT) and laser ablation (LA) ICP-MS

Important information for event attendees and external visitors

coronavirus (COVID-19)In light of the most recent advice from the UK Government about stopping non-essential travel and increasing social distancing, most of our events have been rescheduled or moved to an online format.

Our sites have been placed on a restricted access condition, which means that only staff who are doing essential work can get access. All other colleagues will be working from home or staying at home even if they are unable to work remotely.

We have excellent and free to use video conference and conference call systems and are happy to make these facilities available to help you engage with us. Meetings are taking place via video conference with participants joining individually from their own locations; check with the relevant member of staff for advice.

As the situation is constantly changing, please check the UK Government and NHS websites for the latest advice and updates.

If you have any questions or concerns, please email events@hutton.ac.uk.

Seminar
2 September 2014, 11am : Free
at the James Hutton Institute Aberdeen, AB15 8HQ
for scientists, students and other interested parties
Paul Williams

Dr Paul Williams from Queen's University Belfast will be giving a seminar entitled 'High resolution 2D imaging of trace elements in soils by diffusive gradient thin-film (DGT) and laser ablation (LA) ICP-MS' at the James Hutton Institute Aberdeen.

Abstract

Rice contains ~10 times more arsenic than other cereal staples, and is the dominant food source of inorganic arsenic exposure to the world’s population. The anaerobic biogeochemistry of paddy fields makes them vulnerable to excessive arsenic mobilisation and subsequently assimilation by rice. Uptake typically occurs at root apices, sites of rapid entry for water and nutrients, where radial oxygen losses are highest. Therefore, nutrient and toxic metal uptake must largely occur through zones of oxidation and micro-gradients in H+concentration. Yet, the precise processes controlling the acquisition of trace elements in rice are difficult to explore experimentally due to a lack of suitable methods.

Using the diffusive gradients in thin films (DGT) gel based dynamic sampling technology, planar optode and laser ablation-ICP-MS as exemplar techniques, this presentation reviews recent advances in chemical imaging and the measurement of arsenic dynamics in rice rhizospheres. The results highlight the need to consider the kinetics of arsenic mobilisation, in situ speciation, as well as the importance of simultaneous/high resolution measurements of multiple analytes, in order to decipher the geochemical processes modulating arsenic remobilisation dispersion and plant uptake.

Biography

Dr Paul Williams is a Lecturer in Soil and Environmental Biogeochemistry at Queen’s University Belfast. Paul obtained his PhD degree in Biological Sciences from the University of Aberdeen in 2007. Previous to working at Queen’s he held Research Fellowships with the Chinese Academy of Sciences, Lancaster University and a Lectureship with the University of Nottingham. 

Paul, an analytical and environmental chemist, has research interests orientated around the role of soils and rhizospheres in global food security. Specific interests and projects focus on the influence of soil dynamic processes and chemical speciation on trace element (both toxic and essential) uptake by plants, visualising rhizosphere micro-heterogeneity through high resolution measurements using DGT and DET techniques, and bettering in situmonitoring of the environment.

Techniques and methods that Paul uses include multi-element chromatography (IC-ICP-MS), laser-based analytical measurement (LA-ICP-MS), passive sampling (DGT, DET), optical sensors (colour ratiometric planar optodes), in-situ UV/vis spectrometry and XRF analysis.

The seminar will be hosted by Dr Luke Beesley.

Share our content

Share this

Tags


Printed from /events/high-resolution-2d-imaging-trace-elements-soils-diffusive-gradient-thin-film-dgt-and-laser on 13/07/20 06:24:50 AM

The James Hutton Research Institute is the result of the merger in April 2011 of MLURI and SCRI. This merger formed a new powerhouse for research into food, land use, and climate change.