Oxygen and mercury in inorganic and organic mercury compounds are determined simultaneously by a modification of the Schütze-Unterzaucher method. The determination of mercury is not influenced by the presence of sulphur and nitrogen in the samples. In 13 inorganic and organic mercury compounds, oxygen has been determined with an error of less than 0.4% and mercury with an error of less than 0.5%.
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http://dx.doi.org/10.1016/0039-9140(79)80235-0 | DOI Listing |
J Am Chem Soc
January 2025
Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States.
Hydrogen atom transfer (HAT) reactions and their kinetic barriers Δ are important in organic and inorganic chemistry. This study examines factors that influence Δ, reporting the kinetics and thermodynamics of HAT from various ruthenium bis(acetylacetonate) pyridine-imidazole complexes to nitroxyl radicals. Across these 36 reactions, the Δ and Δ can be independently varied, with different sets of Ru complexes primarily tuning either their ps or their °s.
View Article and Find Full Text PDFChem Commun (Camb)
January 2025
Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
This review discusses the properties of strongly oxidizing radicals in organic and aqueous media and highlights the challenges in obtaining accurate values of their reduction potentials. Transient redox equilibrium methods based on the use of strong photooxidants or initiated by pulse radiolysis are shown to provide versatile approaches for decoupling electron transfer reactions from follow-up reactivity of unstable radical species, resulting in accurate values of reduction potentials of very positive couples, including some solvent radical cations. We also show that correlations of reduction potentials with Hammett ∑+p parameters, as well as gas phase ionization potentials, can be used to estimate the redox properties of unknown couples within a homologous series of compounds.
View Article and Find Full Text PDFEnviron Sci Pollut Res Int
January 2025
Laboratory of Design and Development of Innovative Knitted Textiles and Garments, Department of Industrial Design and Production Engineering, University of West Attica, 12244, Egaleo, Attica, Greece.
This study investigates the production of high-purity cellulose pulp from peach (Prunus persica) fruit wastes generated during the processing of a Greek compote and juice production industry. A three-step chemical process is used, including alkaline treatment with NaOH, organic acid (acetic and formic) treatment, and hydrogen peroxide treatment, with the goal of cellulose extraction and purification. A fractional factorial design optimized reagent levels, revealing the strong influence of NaOH concentration on α-cellulose content and degree of polymerization.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
Nippon Denko Co., Ltd., 1-4-16 Yaesu, Chuo-ku, Tokyo 103-8282, Japan.
Terahertz waves are gathering attention as carrier waves for next-generation wireless communications such as sixth-generation wireless communication networks and autonomous driving systems. Electromagnetic-wave absorbers for the terahertz-wave region are necessary to ensure information security and avoid interference issues. Herein we report a high-performance terahertz-wave absorber composed of a composite of metallic λ-TiO and insulating TiO nanocrystals (λ-TiO@TiO).
View Article and Find Full Text PDFWater Sci Technol
January 2025
Norwegian University of Life Sciences, Department of Building and Environmental Technology, P.O. Box 5003, 1430 Ås, Norway.
The need for stringent phosphorus removal from domestic wastewater is increasing to mitigate eutrophication, while efficient phosphate reuse is critical due to the global phosphate crisis. Combining aluminum sulfate (ALS) with high molecular weight organic polymers achieved 95-99% removal of particles, turbidity, and phosphates, reducing ALS usage by 40%. We propose mechanisms to explain the enhanced treatment efficiency.
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