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Selected papers from the latest issue:Use of carbon nanotubes and electrothermal atomic absorption spectrometry for the speciation of very low amounts of arsenic and antimony in waters
28 August 2011, 20:07:53
Publication year: 2011
Source: Talanta, In Press, Accepted Manuscript, Available online 27 August 2011
Ignacio, López-García , Ricardo E., Rivas , Manuel, Hernández-Córdoba
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 of a plug of an ammonia solution. The atomizer is impregnated with a tungsten salt which acts as an effective chemical modifier during the heating cycle. Total inorganic arsenic and antimony are determined after the reduction of the pentavalent forms with an ammonium iodide solution. Pentavalent arsenic...
Source: Talanta, In Press, Accepted Manuscript, Available online 27 August 2011
Ignacio, López-García , Ricardo E., Rivas , Manuel, Hernández-Córdoba
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 of a plug of an ammonia solution. The atomizer is impregnated with a tungsten salt which acts as an effective chemical modifier during the heating cycle. Total inorganic arsenic and antimony are determined after the reduction of the pentavalent forms with an ammonium iodide solution. Pentavalent arsenic...
Synthesis of molecularly-imprinted monolithic fibers for solid-phase microextraction of acetaldehyde from head-space of beverages stored in PET bottles
28 August 2011, 20:07:53
Publication year: 2011
Source: Talanta, In Press, Accepted Manuscript, Available online 27 August 2011
A. Rajabi, Khorrami , E., Narouenezhad
Molecularly-imprinted monolithic fibers were synthesized and evaluated for solid-phase microextraction (SPME) of acetaldehyde from head-space of beverages stored in poly(ethylene terephthalate) (PET) bottles. The fibers were prepared by co-polymerization of methacrylic acid and ethylene glycole diethacrylate as functional monomer and cross-linker, respectively. Acetaldehyde was used as template molecule during polymerization process, in order to leave specific cavities after leaching off from the co-polymer. Narrow bore (i.d. 100μm) glass capillaries as molds were filled with polymerization mixture containing cross linker, functional monomer, template molecule, initiator and porogen solvent. This mixture is then polymerized to form a continuous porous monolith that conforms...
Highlights: ► We synthesize an acetaldehyde-imprinted monolithic fiber. ► It selectively extracts acetaldehyde from head-space of beverages stored in PET bottles. ► The fiber shows promising mechanical and thermal stability. ► The derivatization step is not necessary. Good linear range and long durability are the other advantages.
Source: Talanta, In Press, Accepted Manuscript, Available online 27 August 2011
A. Rajabi, Khorrami , E., Narouenezhad
Molecularly-imprinted monolithic fibers were synthesized and evaluated for solid-phase microextraction (SPME) of acetaldehyde from head-space of beverages stored in poly(ethylene terephthalate) (PET) bottles. The fibers were prepared by co-polymerization of methacrylic acid and ethylene glycole diethacrylate as functional monomer and cross-linker, respectively. Acetaldehyde was used as template molecule during polymerization process, in order to leave specific cavities after leaching off from the co-polymer. Narrow bore (i.d. 100μm) glass capillaries as molds were filled with polymerization mixture containing cross linker, functional monomer, template molecule, initiator and porogen solvent. This mixture is then polymerized to form a continuous porous monolith that conforms...
Highlights: ► We synthesize an acetaldehyde-imprinted monolithic fiber. ► It selectively extracts acetaldehyde from head-space of beverages stored in PET bottles. ► The fiber shows promising mechanical and thermal stability. ► The derivatization step is not necessary. Good linear range and long durability are the other advantages.
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