RT Conference Proceedings
T1 Semiautomatic method for the ultra-trace arsenic speciation in environmental waters via magnetic solid phase extraction prior to HPLC-ICP-MS determination
A1 Montoro-Leal, Pablo
A1 García-Mesa, Juan Carlos
A1 López-Guerrero, María del Mar
A1 Siles-Cordero, María Teresa
A1 Vereda-Alonso, Elisa Isabel
K1 Extracción (Química)
K1 Arsénico
K1 Nanopartículas
AB A new magnetic functionalized material based on graphene oxide magnetic nanoparticles (MGO)was designed and characterized in order to develop a magnetic solid phase extraction method(MSPE) to enrich both inorganic and organic arsenic species in environmental waters. A FIA systemis used to preconcentrate the arsenic species simultaneously, while the ultra-trace separation anddetermination of arsenobetaine (AsBet), cacodylate, As(III) and As(V) species have been achievedby high performance liquid chromatography coupled to inductively coupled plasma massspectrometry (HPLC-ICP-MS) technique. The sample is introduced in the FIA system where theMSPE takes place, and 1 ml of eluent is collected in a chromatographic vial. After preconcentration,the vial is introduced in the autosampler of HPLC-ICP-MS. Therefore, preconcentration andseparation/determination processes are automatic and conducted separately (Figure 1). Thestrategy of this work was focused on the compatibility between the MSPE eluent and the mobilephase of HPLC column system, resulting in an efficient and reliable semiautomaticpreconcentration and detection of inorganic and organic arsenic speciation. To the best of ourknowledge, this is the first method combining an online MSPE and HPLC-MS, and one of the firstusing a magnetic nanomaterial based on MGO for online MSPE. Under the optimized conditions,the preconcentration factors obtained for AsBet, cacodilate, As(III) and As(V) with 12 mL samplesolution were 4, 12, 6 and 19, respectively. The LODs for the arsenic species were AsBet 7 ng L -1,cacodylate 0.4 ng L-1, As(III) 1.0 ng L-1 and As(V) 0.2 ng L-1 and RSDs < 5%. The developed methodwas validated by analyzing tap water, well water and seawater samples, and Certified ReferenceMaterials; fortified lake water TMDA 64.3 and seawater Cass-6 NRC, promising for routinemonitoring of arsenic species in environmental water
YR 2021
FD 2021-01-08
LK https://hdl.handle.net/10630/20667
UL https://hdl.handle.net/10630/20667
LA eng
NO SHOTGUN PRESENTATION
NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía TechFondos FEDER y Junta de Andalucía Proyecto UMA18-FEDERJA-060Plan Propio, Proyecto Puente, Universidad de Málaga
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026