scholarly journals Dispersive micro solid-phase extraction using multiwalled carbon nanotubes combined with portable total-reflection X-ray fluorescence spectrometry for the determination of trace amounts of Pb and Cd in water samples

2013 ◽  
Vol 28 (5) ◽  
pp. 736 ◽  
Author(s):  
Karina Kocot ◽  
Beata Zawisza ◽  
Eva Marguí ◽  
Ignasi Queralt ◽  
Manuela Hidalgo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Multiwalled Carbon Nanotubes ◽  
Water Samples ◽  
Solid Phase ◽  
Total Reflection ◽  
Phase Extraction ◽  
Multiwalled Carbon ◽  
X Ray

Determination of phthalates in beverages using multiwalled carbon nanotubes dispersive solid-phase extraction before HPLC-MS

2018 ◽  
Vol 41 (12) ◽  
pp. 2613-2622 ◽  
Author(s):  
Javier González-Sálamo ◽  
Javier Hernández-Borges ◽  
María del Mar Afonso ◽  
Miguel Ángel Rodríguez-Delgado
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Multiwalled Carbon Nanotubes ◽  
Solid Phase ◽  
Phase Extraction ◽  
Dispersive Solid Phase Extraction ◽  
Multiwalled Carbon

scholarly journals Dispersive Micro Solid-Phase Extraction Using Multiwalled Carbon Nanotubes for Simultaneous Determination of Trace Metal Ions by Energy-Dispersive X-ray Fluorescence Spectrometry

2013 ◽  
Vol 67 (2) ◽  
pp. 204-209 ◽  
Author(s):  
Robert Skorek ◽  
Beata Zawisza ◽  
Eva Marguí ◽  
Ignasi Queralt ◽  
Rafal Sitko
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Trace Metal ◽  
Solid Phase ◽  
Sample Volume ◽  
Phase Extraction ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Trace Metal Ions

A 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.

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