A chemometric approach to the interaction of hydrogen peroxide and thermally activated persulfate in the removal of aromatic compounds.

This study evaluates the combined use of H₂O₂ and thermally activated S₂O₈⁻ (T-PDS) for the degradation of phenolic compounds (PhOH) in wastewater, aiming to limit or eliminate sludge production. Phenolic compounds are common in industrial effluents, and their effective removal is crucial for reducing environmental impact. The study employs Response Surface Methodology (RSM) and Principal Component Analysis (PCA) to optimise critical variables such as temperature, pH, and oxidant concentrations.

Polycyclic aromatic hydrocarbons (PAHs) in black crusts on stone monuments in Milan: detection, quantification, distributions, and source assessment.

In the field of conservation of cultural heritage, one must always consider the environmental conditions in which the works of art are located and the level of atmospheric pollution to which they are exposed, especially in the case of monuments stored outdoors. The present study is focused on the detection and the quantification of polycyclic aromatic hydrocarbons (PAHs) in black crust samples from the Monumental Cemetery of Milan (Italy), and the assessment of their sources through the analysis of the distributions of the different compounds in the samples, together with the use of diagnostic ratios. Six black crust samples taken from funerary monuments were analyzed.

Probing the non-covalent forces key to the thermodynamics of β-hairpin unfolding.

Although it is well understood that the graph of the free energy of unfolding (Δ) of a globular protein with temperature approximates to a negative parabola, there is as yet no link between this global (G) Δ () function and the individual structural elements-residue type and the non-covalent forces between groups-contributing to it. As such, there is little understanding of how each structural element contributes to the globally assessed changes of enthalpy (Δ ), entropy (Δ ), and heat capacity (Δ ) of unfolding calculated from the Δ () function. To address this situation, we consider here an alternative approach to examining fold stability.