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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of an amperometric detector for capillary HPLC (1990)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 13 (1990), S. 112-115 
    Details
    ISSN: 0935-6304
    Keywords: Micro-LC ; Packed fused-silica capillary columns ; Electrochemical detector ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The main characteristics of a dual-electrode amperometric detector with a cell of the “cylinder-in-flow” type with a working wire electrode have been investigated. The effective cell volume is 10-40 nl in a system with 0.2-0.4 mm i.d. packed fused-silica columns. Extra-column spreading at the optimum elution rate does not exceed 0.005 μl2. The linear range is 103 at a relative standard deviation of 0.009. The low noise level (2-3 pA) facilitates determination of electro-active substances. The detection limit for catecholamines is of the order of tenths of a femtomole.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240130207
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical detection for trace analysis by capillary HPLC (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 663-665 
    Details
    ISSN: 0935-6304
    Keywords: Micro-LC ; Amperometric detector ; Nitrophenols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An amperometric-type electrochemical detector is proposed for use in capillary HPLC. Its cell (volume 60 nl) contains a cylindrical working electrode for detecting the presence of electroactive compounds. The noise level is 3-5 pA depending on the potential. The minimum detectable concentrations of the o-, m-, and p- isomers of nitrophenol (after separation of a 20 μl sample on a fused silica column) lies between 4 and 18 ng/l. The relative standard deviation of the height of the chromatographic peaks of phenols present at concentrations of 10 ppb does not exceed 0. 08 (n = 5).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240161108
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    Paper (German National Licenses)
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