A combination of magnetic solid phase extraction (MSPE) and dispersive liquid phase microextraction (DLPME) was applied in a new method for preconcentration and extremely sensitive determination of thallium in aqueous samples. The first step of extraction uses a Fe3O4-graphene oxide conjugate whose surface was covalently linked to the chelator 4-methyl-2(2-pyrazinyl)-1,3-thiazole-5-carboxy acid. After completion of MSPE, the nanoparticles were eluted with benzyl alcohol. In order to further enhance preconcentration, the benzyl alcohol phase containing the thallium chelate is used as a dispersing solvent for DLPME. After the elution, the preconcentrated thallium phase is transferred into a Rh/Pt/Pd-modified graphite tube and quantified via graphite furnace AAS. After optimization of the experimental conditions, the calibration plot is linear in the 0.015 to 4 μg·L−1 thallium concentration range, and the detection limit (at an S/N ratio of 3) is 12 ng·L−1. An absolute detection limit of 120 fg was determined when injecting a 10 μL volume into the graphite furnace. When using a 100 mL sample solution and 10 μL of the extraction solvent, the enrichment factor is as large as 6500, with an overall 65% recovery if MSPE and DLPME are combined. Selectivity of the method is achieved by masking of possibly interfering ions with EDTA.
Microchimica Acta – Springer Journals
Published: Jun 2, 2017
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera