Methods for improving solvent properties
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In hydrometallurgical processes, the separation of nickel and cobalt is challenging. Cyanex272 dialkyl phosphinic acid is generally used to separatet hese elements. The most eﬀective separation requires that the reaction mixture be as pure as possible from various interferences such as carboxylic acids. This thesis investigates various possibilities for removing carboxylic acids from the extraction mixture. Possibility of utilizing diﬀerent pH isotherms and diﬀerent water solubilities of carboxylic acids and Cyanex 272 for separation was investigated. Normal phase chromatography was attempted with one minute fractioning and ﬁnally molecular catcher was tested. Separation of extractants in these experiments, with these parameters failed.Possibility of utilizing diﬀerent pH isotherms and diﬀerent water solubilities of carboxylic acids and Cyanex 272 for separation was investigated. Normal phasechromatographywasattemptedwithoneminutefractioningandﬁnally molecular catcher was tested. Separation of extractants in these experiments, with these parameters failed ...
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A multiresidue analytical method for trace level determination of antibiotics and antiretroviral drugs in wastewater and surface water using SPE-LC-MS/MS and matrix-matched standards Ngumba, Elijah; Kosunen, Päivi; Gachanja, Anthony; Tuhkanen, Tuula (RSC Publications, 2016)An analytical method for simultaneous determination of seven commonly used antibiotics and three antiretrovirals in surface water and urban wastewater at the ng L−1 level has been developed. The method involves concentration ...
Valto, Piia (University of Jyväskylä, 2011)A fast analysis method with an online sample enrichment technique for the analysis of resin and fatty acids present in papermaking process waters was developed. This method was based on atmospheric pressure chemical ...
Coordination Complexes of a Neutral 1,2,4-Benzotriazinyl Radical Ligand: Synthesis, Molecular and Electronic Structures, and Magnetic Properties Morgan, Ian; Mansikkamäki, Akseli; Zissimou, Georgia A.; Koutentis, Panayoitis A.; Rouzières, Mathieu; Clérac, Rodolphe; Tuononen, Heikki (Wiley - VCH Verlag GmbH & Co. KGaA, 2015)A series of d-block metal complexes of the recently reported coordinating neutral radical ligand 1-phenyl-3-(pyrid-2-yl)-1,4-dihydro-1,2,4-benzotriazin-4-yl (1) was synthesized. The investigated systems contain the ...
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