1955/05/01 by Arthur T. Giese, C. S. French · 1 citation
Chemical Engineering · Environmental Science · Chemistry · Mathematics · #Analytical Chemistry and Sensors #Water Quality Monitoring and Analysis #Spectroscopy and Chemometric Analyses #Derivative (finance) #Extinction (optical mineralogy) #Absorption (acoustics) #Second derivative #Spectrophotometry #Molar absorptivity #Wavelength #Analytical Chemistry (journal) #Chemistry #Optics #Absorption spectroscopy #Intensity (physics) #Physics #Chromatography #Mathematics
paper · doi:10.1366/000370255774634089
openalex publication_date 1955/05/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
In the measurement of absorption spectra, it is difficult to detect low intensity bands overlapped by bands of higher intensity. Their detection is greatly facilitated by measuring the first derivative of the transmission curve with respect to wavelength. A machine is under development in this laboratory to plot this derivative. A graphical study is here made of the behavior of the derivative curves for overlapping absorption bands of differing heights, widths and separation intervals and the derivatives are compared with the corresponding extinction and percent transmission curves. The curves here presented are intended as illustrations of the possibilities inherent in derivative spectrophotometry and for the identification of extinction or transmission curve types from measured derivatives.