Quantitative analysis of mixed hydrofluoric and nitric acids using Raman spectroscopy with partial least squares regression
- Quantitative analysis of mixed hydrofluoric and nitric acids using Raman spectroscopy with partial least squares regression
- 강구민; 이광칠; 박해성; 이진호; 정영진; 김경식; 손붕호; 박형국
- Issue Date
- VOL 81, NO 4-5-1417
- optimization in the manufacturing process can be facilitated by optically detecting the concentration of the mixed acids In this work, we developed a novel method which allows us to obtain the concentrations of hydrofluoric acid (HF) and nitric acid (HNO(3)) mixture samples with high accuracy The experiments were carried out for the mixed acids which consist of the HF (0 5-3 wt%) and the HNO(3) (2-12 wt%) at room temperature Fourier Transform Raman spectroscopy has been utilized to measure the concentration of the mixed acids HF and HNO(3), because the mixture sample has several strong Raman bands caused by the vibrational mode of each acid in this spectrum The calibration of spectral data has been performed using the partial least squares regression method which is ideal for local range data treatment. Several figures of merit (FOM) were calculated using the concept of net analyte signal (NAS) to evaluate performance of our methodology.
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