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Title

Dispersive micro solid-phase extraction using multiwalled carbon nanotubes for simultaneous determination of trace metal ions by energy-dispersive x-ray fluorescence spectrometry

AuthorsSkorek, R.; Zawisza, B.; Marguí, Eva ; Queralt Mitjans, Ignacio ; Sitko, R.
KeywordsX-ray fluorescence spectrometry
XRF
Carbon nanotubes
SPE
Preconcentration
Environmental samples
Aqueous samples
Inorganic analysis
Issue Date2013
PublisherSociety for Applied Spectroscopy
CitationApplied Spectroscopy 67: 204- 209 (2013)
AbstractA methodology based on dispersive micro solid-phase extraction (DMSPE) using multiwalled carbon nanotubes (MWCNTs) as solid sorbent prior to measurement with energy-dispersive X-ray fluorescence (EDXRF) spectrometry is proposed. The procedure consists of chelating of nickel, cobalt, copper, and lead ions with ammonium pyrrolidinedi-thiocarbamate (APDC) and posterior adsorption of metal chelates on MWCNTs (1 mg) dispersed in the aqueous samples (100 mL). DMSPE promotes immediate interaction between the metal chelates and MWCNTs and shortens time of sample preparation in comparison with classical solid-phase extraction. After microextraction process, MWCNTs are collected onto filter and directly measured by EDXRF. With this technique, the direct quantification of metal species held in solid materials is possible and, therefore, the elution step can be avoided. The effects of various experimental parameters such as pH of the solution, amounts of MWCNTs and APDC, sample volume, and time of stirring were investigated. With the best analytical conditions (1 mg of MWCNTs, 2 mg of APDC, 100 mL sample volume, pH = 7, and 5 min time of stirring), Co(II), Ni(II), Cu(II), and Pb(II) can be simultaneously determined with very good recoveries (101%, 98%, 96%, 99%, respectively) and detection limits (0.43, 0.11, 0.46, 0.15 ng mL>1, respectively). The method was applied in determination of trace metal ions in tap water and wastewater samples. © 2013 Society for Applied Spectroscopy.
Publisher version (URL)http://dx.doi.org/10.1366/12-06738
URIhttp://hdl.handle.net/10261/76598
DOI10.1366/12-06738
Identifiersdoi: 10.1366/12-06738
issn: 0003-7028
Appears in Collections:(ICTJA) Artículos
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