Results 31 to 40 of about 675 (179)
Brazilian Journal of Radiation Sciences, 2020 This work refers to determination of thorium and uranium isotopes in the mining lixiviation liquor samples. The analytical procedure involves sample preparation steps for rare earth elements, thorium and uranium separation, besides alpha spectrometry ...
Aluisio Souza Reis +1 more
doaj +1 more source
Metals, 2023 The role of the tartrate ion in the extraction of copper from oxidized ore in aqueous alkaline medium is first reported. This was demonstrated by a sequential evaluation of the following: (i) The formation of an ionic complex resulting from the ...
Félix J. Sueros Velarde +3 more
doaj +1 more source
Archaeometry, Volume 68, Issue 4, Page 646-658, August 2026.ABSTRACT Geochemical data compiled from dried sediments from three water reservoirs at the ancient Maya city of Ucanal, Petén, Guatemala, reveal low to undetectable fecal biomarker concentrations. These low concentrations may be the result of the aerobic decay of sterols combined with well‐managed waste disposal practices.
Jean D. Tremblay +3 more
wiley +1 more source
MATEC Web of Conferences, 2013 La présente étude a été menée dans le but de valoriser le zinc des résidus de lixiviation. Pour ce but, nous avons retenu la méthode goethite qui présente certains avantages.
Benarioua Younes
doaj +1 more source
Small, Volume 22, Issue 39, 13 July 2026.A new hybrid plasmonic material, Au@COF, serves as a recyclable photocatalyst for the light‐mediated dehydrogenation and hydrogenation of N‐Heterocycles, where simply adjusting the reaction conditions allows control over the reaction mechanism, marking a notable breakthrough for hydrogen storage.
Alba Sorroche +4 more
wiley +1 more source
Revista Colombiana de Química, 2017 Corn (Zea mays L.) is the second most cultivated cereal in the world and is use as raw material for different kind of industries. To date no reports about obtaining giberellic acid (GA3) from corn have been found.
Juan David Rivera +2 more
doaj +1 more source
Thermodynamic Considerations on Gold Dissolution in Different Lixiviants (II)
Revista de Chimie, 2019 The paper presents the main thermodynamic aspects related to the gold dissolution with thiosulphate, thiourea and thiocyanate. The thermodynamic stability of the gold complexes and the reaction mechanisms that ensure the gold dissolution in the most representative lixiviants with potential for use in the gold industry are analyzed. The performances of
Catalin Alexandru Barbu +4 more
openaire +1 more source
Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 7, July 2026.Abstract Anticipating the decomposition of permafrost organic matter (OM) following thaw is critical for improving projections of climate‐carbon feedbacks. Stable carbon (C) and nitrogen (N) isotope profiles provide integrated records of the environmental and biogeochemical processes that shaped OM during its accumulation and may therefore improve our ...
Lucas Deschamps +3 more
wiley +1 more source
Alkaline Earth Metal Oxide Catalysts for Biodiesel Production from Palm Oil: Elucidation of Process Behaviors and Modeling Using Response Surface Methodology [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2013 Four different alkaline earth metal oxides i.e. MgO, CaO, SrO and BaO were used as heterogeneous catalysts for biodiesel production from palm oil. Effects of critical process variables i.e.
Babak Salamatinia +2 more
doaj
International Journal of Applied Glass Science, Volume 17, Issue 3, July 2026.Glass samples from the Rio de Janeiro Cathedral (Brazil) were evaluated to characterize their mechanical and chemical stability. ABSTRACT The Cathedral of São Sebastião in Rio de Janeiro (Brazil) contains a series of concrete stained‐glass windows made using the dalle de verre technique, which have undergone a natural degradation process.
Clara García‐Sánchez +3 more
wiley +1 more source