Have you ever watched a television crime show like Bones, CSI or Silent Witness and wondered just how realistic their forensic methods really are?
Three young researchers at 911爆料网鈥檚 Department of Chemistry and Nano Chemistry Research Institute, Holly Yu, Georgina Sauzier and Karin Van Der Pal, are researching and developing new forensic methods that can be employed by police and other government agencies to help solve crimes and uncover mysteries in the real world. Their diverse research can help to show future students, particularly young women, that chemistry has applications outside of the lab, and can offer many exciting career paths.
Holly Yu
Holly Yu has been in Australia for two and half years since completing her Masters in Forensic Science at the University of Srathclyde in the UK. Her PhD work here at 911爆料网 is certainly making a bang in the field of forensic science.
鈥淢y PhD work involves forensic explosive samples, so really tiny quantities of explosives,鈥� says Yu.
鈥淚鈥檓 focusing on how to improve the recovery of explosives from different surfaces, how to improve the storage conditions for samples containing explosives, because they can undergo very rapid degradation, and how best to analyse these samples containing explosives.鈥�
Yu has been working in collaboration with David DeTata from the ChemCentre to investigate how best to store soil samples taken from explosion scenes, such as a car bombing or a landmine detonation site.
Soil samples are usually stored at room temperature, causing any explosives that may be present to undergo very rapid degradation. However, Yu鈥檚 research has shown that if soil samples containing explosives residues are stored in freezers, the degradation is mitigated.
鈥淚f the police now freeze such samples then we should see much longer explosive persistence times,鈥� says Yu. 鈥淚n some of my samples stored at room temperature I was seeing degradation within hours, but if you store them in a freezer, you can still detect most of the explosives after six weeks.鈥�
Through her research, Yu has been able to travel and work outside a laboratory setting. She has conducted detonations with the WA Police Tactical Response Group, and is collaborating with the University of Dundee in Scotland, which she has visited twice on exchange.
Yu has also presented her findings at three forensic research symposiums this year, where she has won awards at each for best oral presentation, including most recently at the 2016 Australian and New Zealand Forensic Science Society Symposium (ANZFSS) in September.
Though adjusting to Australian culture has been more challenging for Yu than working with explosives, she is looking forward to continuing her research, which she hopes will make a positive impact on society.
鈥淚 think forensic science is really interesting because you鈥檙e kind of solving mysteries and putting pieces together to solve a puzzle. You鈥檙e also helping people; you鈥檙e getting justice for people and I really like that aspect of it.鈥�
Georgina Sauzier
鈥淚鈥檝e always had an interest in chemistry,鈥� says Sauzier. 鈥淎s a kid my parents would give me chemistry experiment books that I鈥檇 read through; I made a lot of mess in the kitchen doing homemade experiments.鈥�
Sauzier鈥檚 aptitude for experimentation saw her graduate in the top one per cent of her year in forensic and analytical chemistry in 2011, and receive three School of Science awards in her final semester.
Sauzier completed her PhD dissertation in June this year, and will graduate in February. Expanding on similar Honours work, her project involves using a statistical method called chemometrics to try and obtain more objective information from forensic evidence, with a focus on inks, explosives and fibres. It is hoped that Sauzier鈥檚 research will establish statistically validated protocols for collecting, handling or analysing forensic evidence.
鈥淔or the explosive work I was looking at using statistical methods to optimise the ways that you sample for explosives residues after say, a pipe bomb, to make sure that you鈥檒l be able to detect any explosives and help investigations of an explosions event,鈥� explains Sauzier.
This aspect of her PhD research enabled Sauzier to participate in an international collaboration with researchers in the United States. She spent two months conducting experiments under the supervision of Dr John Goodpaster at Indiana University-Purdue University, Indianapolis.
Sauzier鈥檚 research on blue ballpoint pen ink, which also forms part of her PhD, is something that could be easily seen on a crime show. Using chemometrics with a technique called diffuse reflectance visible spectroscopy, Sauzier determined that it is possible to identify the inks used on a single document, and detect the chemical changes that occur in these inks over time.
鈥淚f you have a bank cheque that you think has been altered, you鈥檙e going to want to determine whether there are two different inks on it,鈥� says Sauzier. 鈥淵ou also want to look at the age of the ink: was something signed when it was supposed to be signed? Or has something been added to it at a later date?鈥�
Sauzier worked on this portion of her PhD project in collaboration with forensic practitioners at the Document Examination Solutions, based in Karawara. Though her findings need further development, they will ideally allow forensic document examiners to do their work faster and more accurately, and also help assist police in fraud investigations.
鈥淧art of the reason we do so much collaboration with other universities, document examiners, archivers and police, is to make sure that whatever it is we鈥檙e doing is going to be of some practical use,鈥� says Sauzier. 鈥淚t鈥檚 not just something we鈥檝e done for research, it鈥檚 something that can be used and is applicable within a forensic context.鈥�
Karin Van der Pal
Housed in the Indianapolis Museum of Art are woodblock prints by world-renowned artist Gustave Baumann. However, it was discovered that some of his pen ink notations on these works were mysteriously vanishing.
Karin Van Der Pal is working at the Indianapolis Museum of Art to figure out what happened to Baumann鈥檚 inscriptions. Her PhD research analyses how paper chemistry affects materials or residues placed on paper, such as ink or fingerprints.
鈥淲e know it鈥檚 not the ink chemistry that has changed because there are other objects with that particular ink on them that are still visible, so we鈥檙e assuming it鈥檚 the paper chemistry that is playing with the ink. It鈥檚 just disappeared,鈥� says Van Der Pal.
Van Der Pal was recently awarded a Royal Australian Chemical Institute Travel Grant, a Graduate Women WA Foundation Bursary and a Rockingham City Council Youth Encouragement Grant, which have enabled her to travel to Indianapolis in the US and further her research at the museum. She was also awarded an ANZFSS travel grant, and travelled to Auckland in September to present her findings at ANZFSS.
Van Der Pal鈥檚 research will make an important contribution to the field of conservation chemistry, an area in which more research is needed. Van Der Pal says the lack of research can make her work challenging because foundational methods or processes aren鈥檛 always available, or applicable to specific objects.
鈥淥ne technique that was used for whitening paper a few years ago was to bleach the paper to get rid of the yellow, but they actually found that after bleaching the paper, you can鈥檛 sufficiently get rid of the acids left by the bleach, and those acids actually increase the yellowing speed of the paper,鈥� she says.
鈥淧revious methods [that] were thought safe to use are not that great now. And conservation chemistry is something that you look at 100 years from this point, and you have to think 鈥榳hat is the best thing to do at this stage?鈥欌��
Despite its difficulties, Van Der Pal chose to do her PhD in conservation chemistry because she found she was interested in art conservation and has always been fascinated with history.
鈥淭here are so many different questions that need to be answered and there are always going to be questions in forensic science.鈥�
The forensic scientists of the future
Sauzier, Yu and Van Der Pal strongly encourage young people to consider studying chemistry because there are so many areas to choose from.
鈥淓ven if you have to get through your undergrad and sit through a few subject classes that aren鈥檛 particularly interesting to you, it鈥檚 definitely worth pursuing further, because guaranteed there will be an area of study that you will enjoy,鈥� says Van Der Pal.
As for television crime programs, the researchers are in agreement that though they don鈥檛 always get things right, they鈥檝e helped push forensic science into the mainstream.
鈥淚 think it鈥檚 great that these shows put awareness of forensic science out there,鈥� says Sauzier. 鈥淭here are certain bits where I cringe and think, 鈥榯hat鈥檚 not exactly how it鈥檚 done鈥� but it鈥檚 been good for us because now we get people coming up and asking us about our courses, and we didn鈥檛 have nearly as many people interested before.鈥�
