@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS020 prodottidellaricerca:prodotto prodotto:ID276254 . @prefix pubblicazioni: . @prefix unitaDiPersonaleInterno: . unitaDiPersonaleInterno:MATRICOLA4695 pubblicazioni:autoreCNRDi prodotto:ID276254 . unitaDiPersonaleInterno:MATRICOLA9205 pubblicazioni:autoreCNRDi prodotto:ID276254 . unitaDiPersonaleInterno:MATRICOLA8397 pubblicazioni:autoreCNRDi prodotto:ID276254 . unitaDiPersonaleInterno:MATRICOLA39295 pubblicazioni:autoreCNRDi prodotto:ID276254 . @prefix modulo: . modulo:ID8286 prodottidellaricerca:prodotto prodotto:ID276254 . @prefix rdf: . @prefix retescientifica: . prodotto:ID276254 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID276254 rdfs:label "Chemical generation of arsane and methylarsanes with amine boranes. Potentialities for non-chromatographic speciation of arsenic (Articolo in rivista)"@en . @prefix xsd: . prodotto:ID276254 pubblicazioni:anno "2014-01-01T00:00:00+01:00"^^xsd:gYear ; pubblicazioni:doi "10.1021/ac4032466"^^xsd:string . @prefix skos: . prodotto:ID276254 skos:altLabel "
Emanuela Pitzalis , Massimo Onor , Marco Carlo Mascherpa , Giacomo Pacchi , Zoltan Mester , and Alessandro D'Ulivo (2014)
Chemical generation of arsane and methylarsanes with amine boranes. Potentialities for non-chromatographic speciation of arsenic
in Analytical chemistry (Wash.)
"^^rdf:HTML ; pubblicazioni:autori "Emanuela Pitzalis , Massimo Onor , Marco Carlo Mascherpa , Giacomo Pacchi , Zoltan Mester , and Alessandro D'Ulivo"^^xsd:string ; pubblicazioni:url "http://pubs.acs.org/doi/abs/10.1021/ac4032466"^^xsd:string . @prefix ns11: . prodotto:ID276254 pubblicazioni:rivista ns11:ID386574 ; pubblicazioni:affiliazioni "-C.N.R., Consiglio Nazionale delle Ricerche, Institute of Chemistry of OrganoMetallic \nCompounds, Via G. Moruzzi 1, 56124, Pisa, Italy\n-National Research Council of Canada, 1200 Montreal Road, Ottawa, ON K1A 0R6, Canada"^^xsd:string ; pubblicazioni:titolo "Chemical generation of arsane and methylarsanes with amine boranes. Potentialities for non-chromatographic speciation of arsenic"^^xsd:string ; prodottidellaricerca:abstract "The efficiency of chemical generation of arsanes from inorganic arsenic, monomethylarsonic acid (MMAA) and dimethylarsinic acid (DMAA), to arsane, AsH3, monomethylarsane, CH3AsH2 (MMA), and dimethylarsane, (CH3)2AsH (DMA), has been investigated in different reaction media with the aim to better elucidate the mechanisms controlling their generation process and to find the experimental conditions to implement a non-chromatographic arsenic speciation analytical method, which is based on the selective determination of some arsenic species. Studies were peformed by continuous flow hydride generation coupled with atomic spectrometry (CF-HG-AS), using different reductants such as borane-ammonia (AB), borane-tert-butylamine (TBAB), and sodium tetrahydridoborate (THB) in HCl and HClO4 media, in the presence or absence of L-cysteine (Cys). The efficiency of HG processes for MMA and DMA is mainly controlled by the reactivity of the substrates with the borane, which could be strongly influenced by the formation of ion couples. The protonation of arsane did not play a significant role in the employed reaction system. By taking advantage of the different reactivity pattern of As species in selected generation conditions, DMAA and MMAA could be selectively determined in 0.5 and 10 mol l-1 HClO4 solutions, respectively, in the presence of Cys, with AB as the reducing agent. The presence of Cys as a masking agent and the peculiar reducing properties of AB ensured a good control of interferences, as far as it has been observed for Co(II), Ni(II), Cu(II), Fe(II), Fe(III). The overall time needed to complete the prereduction step has been verified for MMAA and DMAA at different acidities in order to achieve the best selectivity. The selective determination of DMAA with AB/Cys in HClO4 has been optimized and applied to certified reference materials (CRMs) of natural waters CASS-4, SLRS-4 and NASS-4 (NRCC). The estimation of DMAA concentration allows to correct the concentration of As(III) for the interference of DMAA in the selective determination of As(III) according to a selective HG method recently reported."@en ; prodottidellaricerca:prodottoDi istituto:CDS020 , modulo:ID8286 ; pubblicazioni:autoreCNR unitaDiPersonaleInterno:MATRICOLA8397 , unitaDiPersonaleInterno:MATRICOLA9205 , unitaDiPersonaleInterno:MATRICOLA4695 , unitaDiPersonaleInterno:MATRICOLA39295 . ns11:ID386574 pubblicazioni:rivistaDi prodotto:ID276254 .