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  • 1
    Electronic Resource
    Electronic Resource
    Separation of organic and inorganic arsenic species by HPLC-ICP-MS (1999)
    Springer
    Fresenius' journal of analytical chemistry 363 (1999), S. 577-581 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The HPLC separation of eight anionic, cationic or neutral arsenic species (arsenite, arsenate, monomethylarsonic acid, dimethylarsinic acid, arsenobetaine, arsenocholine, trimethylarsine oxide and tetramethylarsonium ion) on a high-capacity, anion-exchange column (Ion Pac AS 7, Dionex) was studied. The separation was performed during one run with a nitric acid gradient ranging from pH 4–1.3. The influence of sodium dodecyl sulfate (SDS), sodium octyl sulfate (SOS) and 1,2-benzenedisulfonic acid (BDSA) as ion pairing eluent modifiers was investigated. In addition the effect of elevated temperatures (30 to 40 °C) was studied. The best results were obtained at room temperature of 20 °C with 0.05 mM benzenedisulfonic acid as the eluent modifier. The chromatograph was connected to an ICP-MS via a cross-flow nebulizer. Detection limits obtained with the optimized chromatographic separation were 0.16–0.60 μg As L–1 for different species. The proposed speciation method was applied to the determination of arsenic species in the DORM-2 reference material (Dogfish Muscle) and in aqueous extracts of mushrooms collected on arsenic contaminated ground.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051251
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen zur analytischen Bestimmung von Cadmium in anorganischen Mikroproben durch Atomfluoreszenz mit elektrothermischer Atomisierung (1977)
    Springer
    Microchimica acta 67 (1977), S. 495-504 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Analytical Determination of Traces of Cadmium in Inorganic Matrices by Atomic Fluorescence With Electrothermal Atomization A method for the determination of traces of cadmium in inorganic substances (Ga, As, Al, GaAs) by atomic fluorescence with electrothermal atomization is described. The optimized parameters of the self-made AF-spectrometer and the micro-wave excited, selfmade Cd-EDL are given. The influence of the matrices on the Cd-AFS is discussed. It is shown, that determinations of traces of Cd are possible in easy and truly vapor-isable inorganic matrices by optimization of the volatilization processes. The detection limits are: 0,2 ppb, 5,6 ppb, 44 ppb, 2,5 ppb and 85 ppb relative to 10 mg acid, 1,25 mg Ga, 0,05 mg Al, 1,34 mg As and 0,25 mg GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195961
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Coupling of SPME and GC-AED for the Determination of Organometallic Compounds (2000)
    Springer
    Microchimica acta 135 (2000), S. 91-95 
    Details
    ISSN: 1436-5073
    Keywords: Key words: Speciation; gas chromatography; hyphenated technique; organometallic compounds.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract.  The solid-phase microextraction (SPME) technique coupled with gas chromatography and atomic emission detection was successfully applied for the determination of selected organometallic species of Pb, As and Hg in aqueous samples. To obtain a high extraction yield, the SPME conditions were optimised for each element by fibre selection and varying the exposure time, stirring rate, pH range and desorption time. All the organometallic compounds tested were extracted from the aqueous phase using SPME. The preconcentration factors attained ranged between 40 and 150, depending on the compound. Detection limits in the pg/L and ng/L ranges were achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006040070023
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sensitive Laser induced fluorescence detection of Polyamine-Fluoresceinisothiocyanate-derivatives after capillary zone electrophoretic separation (1995)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 351 (1995), S. 732-738 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Capillary zone electrophoresis (CZE) has been applied for the separation and quantification of the polyamines putrescine (PUT), cadaverine (CAD), spermidine (SPD) and spermine (SPM), after their derivatization with the fluoresceinisothiocyanate isomer I (FITC). The derivatization conditions (character of the derivatization medium and concentration, organic modifier, pH and temperature) and CZE operation conditions have been optimized with respect to a sensitive Laser induced fluorescence detection (λexcitation=488 nm/λdetection=520 nm). A complete separation of CAD from PUT was impossible under the conditions chosen. The detection limits and relative standard deviations for SPM, SPD, CAD, PUT were determined to be 2.9 (12%), 3.2 (7.6%), 0.7 (4.6%), 1.2 (7.6%) nmol/L, respectively. The method has been applied to a pine needle extract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323628
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  • 5
    Electronic Resource
    Electronic Resource
    Solid Phase Microextraction and GC-MIP-AED for the Speciation Analysis of Organomercury Compounds (1999)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 22 (1999), S. 181-182 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; microwave induced emission spectrometry ; speciation ; mercury ; SPME, headspace SPME ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---No abstract
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Elimination of sulfate interferences in the chromatographic determination of o-phosphate using liquid–liquid extraction (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 356 (1996), S. 335-338 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A liquid–liquid extraction procedure for the elimination of high levels of sulfate is described. The proposed method allows the ion-chromatographic determination of ppb concentrations of phosphate in the presence of a 20 000-fold excess of sulfate. The liquid anion exchange resin Amberlite LA-2 was selected to retain sulfate from the sample solution acidified by acetic acid as well as cation-exchange cartridges in the H-form. The detection limit for phosphate was 0.03 mg/L.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663560335
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