Limitations and Potential of Spectral Subtractions in Fourier‐Transform Infrared Spectroscopy of Soil Samples

• DOI: 10.2136/sssaj2015.06.0228
• Publication Date: 2015-12-30T17:10:07Z
• Authors: Andrew J. Margenot; Francisco J. Cald...; Sanjai J. Parikh
• Keywords: Fourier transform spectroscopy

Core Ideas Spectral subtractions are a tool for improving FTIR spectroscopy. Minor components of soil spectra such as SOM can be resolved by subtracting interfering backgrounds (e.g., minerals). Limitations to spectral specific both spectroscopy and soils. There is strong potential improve accuracy applications in spectra. Soil science research increasingly applying Fourier transform infrared (FTIR) analysis organic matter (SOM). However, the compositional complexity soils dominance mineral component limit spectroscopic resolution other minor components. The use subtraction an established technique isolating multicomponent spectra, powerful expand samples. To maximize utility avoid its misuse, consideration must given general soil‐specific limitations subtractions, well experimental objectives. This review summarizes history samples, identifies qualifies misconceptions on use, highlights trade‐offs, recent developments, future directions science.