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The cloud point extraction (CPE) of silver nanoparticles (AgNPs) by Triton X-114 allows chromium (III) ions to be transferred to the surfactant-rich phase, where they can be measured by electrothermal atomic absorption spectrometry. Using 20mL sample and 50μL Triton X-114 (30% w/v), the enrichment factor was 1150, and calibration graphs were obtained in the 5–100ngL −1 chromium range in the...
The dispersive liquid–liquid microextraction of edible oils with a low volume of an acidic solution in the presence of isopropyl alcohol allows cadmium and lead to be completely separated into the aqueous phase. After centrifugation, the metals are determined by electrothermal atomization atomic absorption spectrometry using a palladium salt for chemical modification in the heating cycle. Using a...
A microextraction procedure for the speciation of very low concentrations (0.005–0.2µgL −1 ) of chromium is discussed. To the aqueous sample (10mL), diluted hydrochloric acid, sodium chloride and a small amount of tributylphosphate (80µL) are incorporated, and the mixture is submitted to ultrasounds for 10min. The organic phase recovered after centrifuging is injected into the electrothermal...
A procedure for the determination of ultratrace levels of lead and cadmium using dispersive liquid–liquid microextraction followed by electrothermal atomic absorption spectrometry (ETAAS) has been developed. The ionic liquid, 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 8 MIm][NTf 2 ]), is formed in situ and used to extract the lead and cadmium complexes with ammonium...
A procedure for the determination of inorganic arsenic (III, V) and antimony (III, V) in water samples by using a miniaturized solid-phase extraction with carbon nanotubes followed by electrothermal atomic absorption measurement is proposed. The trivalent species are first complexed with ammonium pyrrolidinedithiocarbamate, next retained in a mini-column containing nanotubes and then eluted by means...
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