Simultaneous determination of iodide and iodate in seawater by transient isotachophoresis–capillary zone electrophoresis with artificial seawater as the background electrolyte

Yokota, Kuriko; Fukushi, Keiichi; Takeda, Sahori; Wakida, Shin‐ichi

doi:10.1016/j.chroma.2004.02.041

Cited by 56 publications

(33 citation statements)

References 17 publications

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“…In the area of seawater analysis, Hirokawa and Timerbaev [62][63][64][65] and the group of Fukushi [66,67] have used tITP for the analysis of inorganic constituents. Seawater contains a high concentration of chloride which, combined with its high electrophoretic mobility, allows it to function perfectly as a leading ion to stack trace anionic components by tITP provided a suitable terminating ion is used.…”

Section: Isotachophoretic Stackingmentioning

confidence: 99%

Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips

2007

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Poor sensitivity is considered to be one of the major limitations of electrophoretic separation methods, particularly when compared to traditional liquid chromatographic techniques. To address this issue, various in-line preconcentration techniques have been developed over the past 15 years, ranging in power and complexity, and there are now a number of well understood approaches routinely capable of providing a 10,000- to 100,000-fold increase in sensitivity, as well as several that can be pushed above a million. Furthermore, these have been achieved with particularly troublesome and often difficult samples, such as those having high salinity from a biological or environmental origin. This review will discuss the most common methods for improving the sensitivity of CE, CEC and microchip version of these, with particular attention to those approaches developed over the last five years.

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Section: Isotachophoretic Stackingmentioning

confidence: 99%

Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips

2007

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“…Analytical methods to be applied for such analyses should be characterized by low detection limits, wide dynamic range and short response time. Various methods have been proposed to this aim such as spectrophotometry [6], ICP-MS [7], capillary electrophoresis [8,9], ion-chromatography and HPLC [10,11], the latter being probably the most widely used. By taking advantage of the electroactivity of iodide, electrochemical methods have been often applied to this goal.…”

Section: Introductionmentioning

confidence: 99%

Gold nanoelectrode ensembles for direct trace electroanalysis of iodide

Pereira

Moretto

Leo

et al. 2006

Analytica Chimica Acta

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A procedure for the standardization of ensembles of gold nanodisk electrodes (NEE) of 30 nm diameter is presented, which is based on the analytical comparison between experimental cyclic voltammograms (CV) obtained at the NEEs in diluted solutions of redox probes and CV patterns obtained by digital simulation. Possible origins of defects sometimes found in NEEs are discussed. Selected NEEs are then employed for the study of the electrochemical oxidation of iodide in acidic solutions. CV patterns display typical quasi-reversible behavior which involves associated chemical reactions between adsorbed and solution species. The main CV characteristics at the NEE compare with those observed at millimeter sized gold disk electrodes (Au-macro), apart a slight shift in E 1/2 values and slightly higher peak to peak separation at the NEE. The detection limit (DL) at NEEs is 0.3 M, which is more than one order of magnitude lower than DL at the Au-macro (4 M). The mechanism of the electrochemical oxidation of iodide at NEEs is discussed. Finally, NEEs are applied to the direct determination of iodide at micromolar concentration levels in real samples, namely in some ophthalmic drugs and iodized table salt.

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“…8) [107,119] and neptunium oxidation states [107]. Much research continues on improving speciation measurements in real-world samples, with advanced CE procedures tailor-made to the analysis of natural [94,95,156,157,160,161,168,173,187,249,250] and waste waters [79,94,95], soil solutions or extracts [78,104], air [253], minerals [245], industrial samples and technological solutions [83,189,190,198,233,235,236,254,256], pharmaceutical preparations [199,248,255], biological material [102,118,175,231,251,252], food [224], and animal feed [211], etc. In particular, an innovative methodology for the automatic monitoring of mercury species in aquatic samples was suggested by Valcárcel's group [237].…”

Section: Speciation Analysismentioning

confidence: 99%

Capillary electrophoresis of inorganic ions: An update

Timerbaev

2004

Electrophoresis

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This review as a sequel of three earlier similar reports gives a summary of the progress and significant methodological developments, starting from 2002, in the use of capillary electrophoresis (CE) for inorganic ion analysis. As substantiated by the illustrative number of relevant references, improvements in sensitivity achieved both in and outside a CE system, advances in manipulating the separation selectivity, novel hardware configurations, and system performance innovations are continually being reported over the review period. Specifically viewed are the recent advancements in elemental (bio)speciation analysis, which remains one of the most fertile areas of CE research, as well as in three recently booming research topics: contactless conductivity detection, separations on microchips, and transient isotachophoretic preconcentration. A state-of-the-art picture of technique's potentialities within the field of interest presented here demonstrates that CE has become recognized and is growing in acceptance as a reliable alternative to traditional analytical methods such as high-performance liquid chromatography (HPLC).

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Simultaneous determination of iodide and iodate in seawater by transient isotachophoresis–capillary zone electrophoresis with artificial seawater as the background electrolyte

Cited by 56 publications

References 17 publications

Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips

Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips

Gold nanoelectrode ensembles for direct trace electroanalysis of iodide

Capillary electrophoresis of inorganic ions: An update

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