Articles
Evaluation Method Robustness To Physical And Batch To Batch Variances Of A Handheld Raman Spectrometer For Bulk Raw Material Authentication
November 18, 2009
•Poster: Evaluation Method Robustness To Physical And Batch To Batch Variances Of A Handheld Raman Spectrometer For Bulk Raw Material Authentication
By Jeremy A. Linoski, Robert C. Brush, Robert L. Green, Wayne Jalenak, Christopher D. Brown, Ahura Scientific, Inc.
Recent instrumentation advances have lead to the commercial availability of several portable spectroscopic technologies, including handheld near-Infrared, mid-Infrared, and Raman. While laboratory vibrational spectroscopy has been a popular choice for raw material identification, widespread applicability of portable systems for raw material authentication has only recently been highlighted. In the context of portable identification systems, Raman and Near-Infrared (NIR) share the advantage that solids can be non-destructively measured through a variety of transparent packaging avoiding the need for costly direct sampling of incoming receipts. One consideration for the application of NIR to raw material analysis is the influence of physical properties such as particle size and packing density which may vary between vendors, or even batches, complicating the final NIR spectrum. Thus, NIR identification methods for solids require that suitable chemometric data treatments are used to remove as much nuisance variability as possible. Since these data treatments generally can not remove 100% of the physical information from the spectra, the continual impact of physical attributes on sample spectra creates significant practical challenges for cost-effective implementation, long-term maintenance of the technique and ultimate method robustness. In contrast, a major benefit of Raman over NIR is its insensitivity to physical properties of the sample. In this study, handheld Raman is examined for spectroscopic contributions due to physical, batch to batch, and supplier differences. A method for a representative solid raw material was developed using a single reference sample spectrum. This method was then challenged by measuring samples sourced from multiple suppliers and range of physical properties.
Click Here To Download:•Poster: Evaluation Method Robustness To Physical And Batch To Batch Variances Of A Handheld Raman Spectrometer For Bulk Raw Material Authentication
