Removal of manganese (II) in water samples by the aeration-filtration process and determination based on 5-Br-PADAP ligand by cathodic stripping voltammetry

Abstract

In this study, manganese (Mn II) was determined in aqueous media by an electrochemical method, and its removal was evaluated using the aeration-filtration process (AFP). An electrochemical sensor based on carbon paste (EPC) modified with the 5-Br-PADAP ligand was used to measure Mn (II) in aqueous media. Through the optimization of analytical parameters in cathodic stripping voltammetry (CSV), real boreholes and well water samples could be analyzed for manganese content. The optimum parameters such as preconcentration potential (1100 mV), preconcentration time (240s), 5-Br-PADAP ligand concentration (20 µmol L-1), and electrode rotation speed during pre-concentration (1000 rpm) were studied and optimized. The detection limit (LOD) is estimated at 3 ´10-7 mol L-1 with a relative standard deviation (RSD) of 3.36%. The real samples showed that some water points have more concentration than the standard. A simple, effective, inexpensive, and rural-friendly method was used for treating manganese-rich water. Following the aeration phase, the sand and gravel column was filtered to remove manganese (II) from the water. The removal efficiency of Mn was obtained at a rate of 74.8- 84.5% and more than 95% after two hours of aeration and 1 hour at pH 8 for real samples.