Wednesday, 18 September 2013

Associate Professor Stewart Walker speaks to the SMAF Chemistry students

Stewart Walker with the SMAF Chemistry teachers: Anthony, Zoe and Naomi
Stewart Walker is a forensic, environmental and analytical chemist, with research interests that cover all aspects of advanced analytical techniques, especially mass spectrometry.

He discussed many real applications of his work, including how mass spectrometry can be used to help determine if a cheque has been forged by analysing ink on paper fibres, how isotope ratios can be used to determine the origins of soil and wine, and whether environmental contamination, for example mercury in the Great Barrier reef, occurred recently or hundreds of years ago.

He explained how he is growing his hair as part of an experiment to show that chemicals trapped in hair can indicate which part of the world a person has been to. Everyday chemicals, including those in soap, drinking water and diet can be used to place the whereabouts of a person, down to the number of days they have spent in a particular location. Analysis of Stewart's hair a few years ago accurately showed that  he had travelled from Australia, to Norway for 10 days, then onto New Orleans for 5 days,  Prague for 10 days and then finally back to Australia. This sort of technology could be used to help identify corpses after natural disasters as well tracking the movement of people around the world.

Tuesday, 3 September 2013

Design Practical Task: SMAF Physics

Student were required to design an investigation that determined the relationship between the strength of the magnetic field around a current carrying solenoid and the distance from the solenoid.


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