Modified Carbon Paste Electrodes Used to Evaluate the Retention Properties of Cd2+, Pb2+ and Cu2+ on Biosolids, Soils and Biocomposites

作者：Flores Alvarez Jose Manuel; Gonzalez Martinez Ignacio; Guillen Bonilla Hector; Gildo Ortz Lorenzo; Reyes Gomez Juan

来源：International Journal of Electrochemical Science, 2016, 11(3): 2066-2084.

• Biosolid
• Soil
• Heavy metal
• Carbon paste electrode
• SEM/EDS
• electroanalysis

The retention properties of Cd(II), Cu(II) and Pb(II) ions were assessed and compared using modified carbon paste electrodes (MCPEs). A biosolid, two different soils and two biocomposites were used as modifying material. Comparing the reactions from the different MCPEs when parameters such as pH, preconcentration time and adsorption/desorption capacity varied, the soils showed that there is a similar adsorption mechanism between them, but very different from that of the biosolid; while the biocomposites show adsorption mechanisms that are intermediate between the soils and the biosolid. The anodic stripping voltammetry (ASV) electrochemical technique proved to be a versatile tool for the metal ions speciation, since it made it possible to distinguish different Cu oxidation states when it is incorporated into the biosolid. In addition, it makes it possible to detect only the heavy metal ions which can be considered bioavailable in the different substrates that were analyzed. Similarly, when ASV coupled with SEM/EDS was used, it made it possible to differentiate the reaction products that result on the surface of the MCPEs.

• 出版日期2016-3