Kolthoff ACS Travel Award Recipients

Katelyn Lambert (senior, chemistry major) and Aysha Scarton (sophomore, forensic chemistry major, chemistry double major) were recently offered the I.M. Kolhoff award for assistance in travel to the Spring 2018 National American Chemical Society Meeting (New Orleans, 3/18-3/22). In addition to a financial award, their accomplishments will be recognized with a presentation at the meeting.

The I.M. Kohthoff award is granted to 3 undergraduate students presenting a poster in analytical chemistry. Preference is generally given to undergraduate chemistry majors with strong academic records. Katelyn and Aysha will be presenting their poster (title and abstract below) in the ACS Division of Analytical Chemistry Poster session, along with graduate students and post-doctoral fellows.

Congratulations on a job well done!

Determination of lead (Pb), barium (Ba), and antimony (Sb) in gunshot residue by thin film hydride generation microwave plasma atomic emission spectroscopy (MP-AES)

Abstract: The microwave plasma atomic emission spectroscopy (MP-AES) is a relatively new analytical technique that has only recently become commercially available from Agilent Technologies as the 4000 series MP-AES. For this work, an Agilent 4200 MP-AES was used to determine Pb, Ba, and Sb in gunshot residue. The 4200 MP-AES uses a nitrogen plasma with a temperature of ~5000K to produce atomic emissions from 178-780nm. Gunshot residue samples were collected using cotton swabs moistened with 5% HNO3. Pb, Ba, and Sb were subsequently extracted with 1% HCl, prior to analysis. To improve the sensitivity of Sb, a thin film hydride generator was utilized in addition to a conventional nebulizer to simultaneously introduce Pb and Ba to the plasma as aerosols, and Sb as SbH3 following reduction to Sb3+ by L-Cysteine and reaction with NaBH4. Thin film hydride generation increased sensitivity by a factor of >10x compared to conventional nebulization, allowing detection limits of less than 1×10-6g, 5×10-8g, and 1×10-6g for Pb, Ba, and Sb respectively, which is sufficient to confirm the presence of gunshot reside in single shot test samples.

Katelyn Lambert

Katelyn Lambert

Aysha Scarton

aysha scarton