Friday, November 6, 2009: 10:05 AM
Kohlberg (Camino Real Hotel)
This presentation describes a new technique of nanomanipulation-coupled with nanospray mass spectrometry as applied to the extraction of small volume ink and paint samples from questioned documents and artwork. A key advantage of using the nanomanipulation technique is that the process does not leave destructive marks on the surface of the document or artwork. This is possible because nanomanipulation-coupled with nanospray mass spectrometry only uses sub microliters sample volumes. Extractions of very small amounts (nanoliter to picoliter) of the ink sample from the questioned documents are sampled using a nanospray capillary. After extraction, the sample is directly introduced into a mass spectrometer through a nanospray port. Analysis of the chemical composition of the ink or pigment is compared to known standards. The information provided on the type of ink gives an estimate of possible age and integrity of the document. A method such as this could be an ideal approach for analyzing extremely small or delicate samples with increased sensitivity and resolution. Thus this procedure can be applied for trace analyses in different fields of chemistry and forensic science.