Mirek Macka

University of Tasmania

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Paul R. Haddad

University of Tasmania

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Brett Paull

University of Tasmania

Michael C. Breadmore

University of Tasmania

Rosanne M. Guijt

Deakin University

Pavel N. Nesterenko

Lomonosov Moscow State University

Emily F. Hilder

University of South Australia

Cameron Johns

University of Tasmania

Philip Zakaria

University of Tasmania

František Foret

Czech Academy of Sciences, Institute of Analytical Chemistry

Nantana Nuchtavorn

Mahidol University

Cooperative Institutions

University of Tasmania

Dublin City University

Dalian University

College Station Medical Center

Stanford Medicine

Masaryk University

Mendel University in Brno

Central European Institute of Technology

Czech Academy of Sciences, Institute of Analytical Chemistry

Brno University of Technology

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On-Column Ion-Exchange Preconcentration of Inorganic Anions in Open Tubular Capillary Electrochromatography with Elution Using Transient-Isotachophoretic Gradients. 3. Implementation and Method Development

Analytical Chemistry (2002)

Michael C. Breadmore Anne S. Palmer Mark A. J. Curran Mirek Macka Nebojša Avdalović

A solid-phase extraction method based on an ion-exchange retention mechanism has been used for in-line preconcentration of inorganic anions prior to their separation by capillary electrophoresis (CE). A single capillary containing a preconcentration and a separation zone has been used in a commercial CE instrument without instrumental modification. Analyte anions were retained on a preconcentration zone comprising an adsorbed layer of cationic latex particles, while separation was achieved in a separation zone comprising fused silica modified by adsorption of a cationic polymer. Elution of the adsorbed analytes was achieved using an eluotropic gradient formed by a transient isotachophoretic boundary between a fluoride electrolyte and a naphthalenedisulfonate electrolyte. Optimization of the electrolyte concentrations, sample injection times, and back-flushing times allowed the successful separation of sub-ppb levels of inorganic anions using a 100-min injection at 2 bar pressure, introducing over 40 capillary volumes of sample. A method based on a 10-min injection allowed a 100-fold increase in sensitivity over conventional hydrodynamic injection for Br-, I-, NO3-, CrO4(2-), and MoO4(2-) with a total analysis time of 25 min. Detection limits were dependent on the injection time but were in the range 2.2-11.6 ppb for a 10-min injection time. This approach was used to determine NO3- in Antarctic ice cores where the analysis could be performed using a sample volume 100 times less than that used for ion chromatography.

Isotachophoresis

Electrochromatography

Ion chromatography

Cationic polymerization

Solid phase extraction

10.1021/ac011217u

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Citations (103)

Simultaneous separation of anions and cations by capillary electrophoresis with high magnitude, reversed electroosmotic flow

Journal of Chromatography A (2004)

Cameron Johns W YANG Mirek Macka Paul R. Haddad

Electro-osmosis

Isotachophoresis

10.1016/s0021-9673(04)01398-6

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Citations (33)

Inorganic monoliths in separation science: A review

Analytica Chimica Acta (2012)

Zarah Walsh Brett Paull Mirek Macka

Monolith

Electrochromatography

Filtration (mathematics)

Chromatographic Separation

10.1016/j.aca.2012.04.029

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Citations (57)

Instrument-free argentometric determination of chloride via trapezoidal distance-based microfluidic paper devices

Analytica Chimica Acta (2019)

Mohammad Rahbar Brett Paull Mirek Macka

10.1016/j.aca.2019.02.048

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Citations (57)

Distance-Based Paper Microfluidic Devices with an Ion Exchange Interaction Immobilized Metallochromic Reagents for Rapid Determination of Heavy Metals in Herbal Supplements and Cosmetics

Yanawut Manmana Mirek Macka Nantana Nuchtavorn

Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Copy DOI

10.2139/ssrn.4853402

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Capillary electrophoretic study of interactions of metal ions with crown ethers, a sulfated β-cyclodextrin, and zwitterionic buffers present as additives in the background electrolyte

Electrophoresis (2002)

Martin Muzikář Josef Havel Mirek Macka

Stability constants of K, Na, Ca, and Ba with 18-crown-6, K, Na, Li with sulfated β-cyclodextrin and K, Li, Ca, Mg, Sr, and Ba ions with ([2-hydroxy-1,1-bis(hydroxymethyl) ethyl]-amino)-1-propanesulfonic acid (TAPS) were determined by capillary electrophoresis and computed using a general least squares minimizing program CELET. The results for 18-crown-6 agreed well with those evaluated by graphical methods or reported in the literature. Previously unknown stability constants of sulfated β-cyclodextrins and TAPS determined for alkali and alkaline earth metals show that sulfated β-cyclodextrin interacts with monovalent metals allowing to manipulate their effective mobility. It interacts stronger with divalent metal cations. TAPS, as zwitterionic buffer widely used in various analytical, biochemical and other applications, forms complexes with alkali and alkaline earth cations, and although the stability constants are rather low, the equilibria should be taken into account when TAPS is used and metal cations are present in solution at the same time.

Hydroxymethyl

Alkaline earth metal

Beta-Cyclodextrins

Divalent

10.1002/1522-2683(200206)23:12<1796::aid-elps1796>3.0.co;2-u

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Citations (26)

Overlapping Commuting in the Region of South Moravia

Geografie (1964)

Mirek Macka

Geografie > Archive > 1964, Vol. 69 > Supplementum 5 > Overlapping Commuting in the Region of… Geografie 1964, 69, 151-156 https://doi.org/10.37040/geografie1964069050151 Overlapping Commuting in the Region of South Moravia Miroslav Macka Czechoslovak Academy of Sciences, Institute of Geography, Brno, Czechia « Previous article Next article »

10.37040/geografie1964069050151

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PTFE Separation Capillaries in CE

Mirek Macka Philip Zakaria Emily F. Hilder Pavel N. Nesterenko Paul R. Haddad

Separation (statistics)

Source

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Factors Influencing the Use of a Low Mobility Co-anlon as an Electrolyte Buffer For Indirect Detection of High Mobility Anions by Capillary Electrophoresis.

PA Doble Mirek Macka Paul R. Haddad

Buffer (optical fiber)

Buffer solution

Source

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Mixed-mode capillary electrochromatographic separation of anionic analytes

Analytical Communications (1999)

Emily F. Hilder Mirek Macka Paul R. Haddad

In this work, mixed-mode capillary electrochromatography is introduced as a method for selectivity manipulation in the separation of charged analytes and is investigated for a number of analytes. This concept involves utilising a component of the eluent to permit the chromatographic and capillary electrophoresis (CE) separation mechanisms to contribute in varying proportions to the separation. This approach was first investigated using a combination of CE with reversed-phase liquid chromatography (RP-LC) for hydrophobic, charged analytes (aliphatic sulfonates), and using the concentration of organic modifier in the eluent to control the contributions of CE and RP-LC. However, the use of reversed-phase columns was found to be problematic for mobile phases with less then 50% organic modifier due to the hydrophobicity of the stationary phase causing the column bed to overheat and dry, and low electroosmotic flow (EOF) values (µ ⩽ 17.8 × 10–9 m2 V–1 s–1) caused additional restrictions. In a second case, ion-exchange stationary phases were used, with the type and concentration of a competing anion in the eluent being used to control the contributions of ion chromatography (IC) and CE to the separation. Nine common inorganic anions were separated using a silica based anion-exchange column and phosphate (pH 7.20) or sulfate (pH 8.2) as eluent with direct UV detection at 214 nm and 17 inorganic and small organic anions were separated using a nitrate eluent (pH 6.80) with indirect UV detection at 214 nm. The separation selectivity was shown to be a combination of IC and CE.

Electrochromatography

Ion chromatography

10.1039/a904506f

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Citations (35)