Furthermore, the spectral features in the 1200 -900 cm -1 range were deconvoluted in order to determine the different interfacial configurations of adsorbed glyphosate through its phosphonate group on Mn oxide and BSA-Mn oxide interfaces. Peak fitting of the spectra was carried out using a second derivative deconvolution algorithm using PeakFit package v.4.12 (Systat Software Inc., San Jose, CA). Details of this process can be found in our previous work.