The effects of electrical parameters (field strength E, total specific energy inputWT and pulse frequency) and product composition on the release of the main metallic elements (Fe, Cr, Ni and Mn) of stainless steel (type 316L) electrodes of a continuous flow parallel plate PEF chamber into the treatmentmedium were investigated. Experiments were carried out by subjecting two different buffer solutions (McIlvaine and Trizma-HCl) with the same values of pH (7) and electrical conductivity (ó=2 mS/cm) to PEF treatments (mono-polar exponential decay pulses, lasting 3.1 ìs) at different intensities (E = 12–21–31 kV/cm, WT = 20–60–100 J/mL) and flow rates (2–3–4L/h). The results showed that, for each field strength applied, the concentration ofmetallic elements increased upon increasing the total specific energy input. At constant total energy input, it was noticed that the metal concentration decreased upon increasing the field strength applied. These results were mainly attributed to the key role played by the pulse frequency in the charging process of the double layer capacitors at the electrode–solution interface. Moreover, it was shown that the amount of metal released from the electrodes markedly depended on the presence of halides in the composition of the processed product.

Metal release from stainless steel electrodes of a PEF treatment chamber: Effects of electrical parameters and food composition

PATARO, GIANPIERO;DONSI', Giorgio;FERRARI, Giovanna
2014

Abstract

The effects of electrical parameters (field strength E, total specific energy inputWT and pulse frequency) and product composition on the release of the main metallic elements (Fe, Cr, Ni and Mn) of stainless steel (type 316L) electrodes of a continuous flow parallel plate PEF chamber into the treatmentmedium were investigated. Experiments were carried out by subjecting two different buffer solutions (McIlvaine and Trizma-HCl) with the same values of pH (7) and electrical conductivity (ó=2 mS/cm) to PEF treatments (mono-polar exponential decay pulses, lasting 3.1 ìs) at different intensities (E = 12–21–31 kV/cm, WT = 20–60–100 J/mL) and flow rates (2–3–4L/h). The results showed that, for each field strength applied, the concentration ofmetallic elements increased upon increasing the total specific energy input. At constant total energy input, it was noticed that the metal concentration decreased upon increasing the field strength applied. These results were mainly attributed to the key role played by the pulse frequency in the charging process of the double layer capacitors at the electrode–solution interface. Moreover, it was shown that the amount of metal released from the electrodes markedly depended on the presence of halides in the composition of the processed product.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4345653
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