Specific adsorption of propiconazole and humic acid on Pt and PtO films

We herein report a study of specific adsorption of propiconazole (PPC) and humic acid (HM) on Pt and PtO films, using cyclic voltammetry (CV) and cyclic massogram (CM) in 0.5 M H2SO4. This approach serves as an alternative to studies involving specific adsorption on soil minerals (e.g., clays, Al/Fe oxides), in which adsorption is evaluated by conducting batch or column sorption experiments and analysis by liquid scintillation counter, high performance liquid chromatography (HPLC), gas chromatography (GC), or capillary electrophoresis. We found that HM adsorbs specifically on Pt and does not interfere with PPC adsorption at the HM concentration ranges examined (10 mg of carbon L−1). PPC adsorbs strongly on Pt in the presence of HM. Also, PtO films were utilized to study HM and PPC adsorption.