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Proceedings Paper

Optical detection of concentrations for mixed acid: HF and HNO3
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Paper Abstract

Mixed acid, which consist of HF and HNO3, is used as a good etchant for silicon dioxide in the wet etching and pickling process of stainless steel. The optical detection of concentration for such mixed acids is crucial to optimize and cut costs in the manufacturing process. Optical detection in the IR regime has been utilized to measure the concentration of the mixed acid for HF and HNO3, because that has several strong absorption peaks, which is contributed by vibrational mode of each acid molecular in this spectrum. In this research, we observed the concentrations of mixed acid to consist of HF and HNO3, as we measured the absorption intensity of OH- stretch and NO3 - stretch band by optical spectroscopy. The concentration range of HF over 1.5-3 wt% and that of HNO3 over 2-10 wt% were studied in room temperature.

Paper Details

Date Published: 13 February 2009
PDF: 7 pages
Proc. SPIE 7183, Multiphoton Microscopy in the Biomedical Sciences IX, 71832A (13 February 2009); doi: 10.1117/12.809955
Show Author Affiliations
Gumin Kang, Yonsei Univ. (Korea, Republic of)
Kyoungsik Kim, Yonsei Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7183:
Multiphoton Microscopy in the Biomedical Sciences IX
Ammasi Periasamy; Peter T. C. So, Editor(s)

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