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  • 1
    Digitale Medien
    Digitale Medien
    Migration behavior of inorganic anions in micellar electrokinetic capillary chromatography using cationic surfactant (1992)
    s.l. : American Chemical Society
    Analytical chemistry 64 (1992), S. 798-801 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00031a017
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  • 2
    Digitale Medien
    Digitale Medien
    Accumulation voltammetry of copper(II) at carbon-paste electrode containing salicylideneamino-2-thiophenol (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 342 (1992), S. 65-69 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Accumulation voltammetry of copper(II) was investigated with a carbon-paste electrode containing salicylideneamino-2-thiophenol(SATP). Copper(II) was accumulated as the copper(II)-SATP complex on the electrode without an applied potential by immersing the electrode in 0.01 mol/l acetate buffer (pH 3.8) containing copper(II). The reduction peak of the copper(II)-SATP complex was observed at −0.12 V (vs. SCE) in 0.01 mol/l acetate buffer (pH 3.8) by scanning the potential in a negative direction. The calibration curve for copper(II) was linear in the range of 2×10−9–1×10−7 mol/l. Since the accumulation of copper(II) is based on a chemical reaction between copper(II) and SATP, copper(II) was selectively accumulated on the electrode. The presented method was applied to the determination of copper(II) in standard reference materials prepared by the National Institute for Environmental Studies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00321693
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  • 3
    Digitale Medien
    Digitale Medien
    Enzyme sensor for L-lactate with a chitosan-mercury film electrode (1993)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 345 (1993), S. 607-609 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary An amperometric enzyme sensor composed of a mercury film electrode and an enzyme-immobilized chitosan membrane is developed. This biosensor is based on both a mercury film electrode detecting the consumption of dissolved dioxygen following enzymatic reaction, and a chitosan membrane. The latter provides an excellent permselectivity and excludes electroactive interferents. The detection range of this biosensor was 1.0×10−5–3.0×10−4 mol/l and the relative standard deviation, R.S.D. at 5.0×10−5 mol/l was 1.4% (n=3). This biosensor was applied to the direct determination of L-lactate in human serum without pretreatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00325809
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  • 4
    Digitale Medien
    Digitale Medien
    Determination of phosphate by flotation-fluorophotometry using ion-pair of molybdophosphate with Rhodamine 6G (1989)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 334 (1989), S. 45-48 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A highly sensitive and accurate fluorophotometric method is described for the determination of phosphate using the ion pair formation of molybdophosphate with Rhodamine 6G. This ion pair is floated at the phase boundary between ethyl ether phase and aqueous phase when the aqueous phase is adjusted to 0.38 mol/l sulphuric acid, 1.9 mmol/l ammonium molybdate and 3.8 Μmol/l Rhodamine 6G. After the phase separation, the floated ion pair is dissolved into the ethyl ether phase by the addition of methanol. The fluorescence intensity of the ion pair is measured at 548 nm with excitation at 530 nm. The calibration curve for phosphate is linear up to 100 ng of phosphorus with a correlation coefficient of 0.999. The relative standard deviation is 2.3% for 100 ng of phosphorus (n=11). Although arsenic(V) causes a positive error, no ions commonly existing in natural water, including silicate, interfere with the determination of phosphate. The proposed method was applied to the determination of phosphate-phosphorus in some natural waters and satisfactory results were obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00481971
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  • 5
    Digitale Medien
    Digitale Medien
    Adsorptive accumulation voltammetry of copper(II) using complex formation reaction with salicylideneamino-2-thiophenol (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 898-901 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The cathodic stripping voltammetry of copper(II) was investigated with a method, based on the adsorptive accumulation of the Cu(II)-salicylideneamino-2-thiophenol (SATP) complex on a hanging mercury drop electrode. The copper(II)-SATP complex could be accumulated on the electrode at −0.20 V in 0.01 mol/l nitric acid. The reduction peak of the copper complex was observed by scanning the potential in a negative direction in the differential pulse mode. The calibration curve for copper was linear over the range 5×10−9–1×10−7 mol/l. This method was applied to determine copper(II) in GSJ (Geological Survey of Japan) standard rock reference materials.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00322028
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  • 6
    Digitale Medien
    Digitale Medien
    New amperometric biosensor for citrate with mercury film electrode (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 801-803 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Citrate ; biosensor ; mercury film electrode ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We describe a new amperometric biosensor which is constructed from a mercury film electrode and an enzyme-immobilized membrane. This biosensor is based on detecting the reduction current of an organic acid produced by enzyme reactions. The detection range of this biosensor was 5.0 × 10-4 - 3.0 × 10-3 M and relative standard deviation, R.S.D. at 1.0 × 10-3 M was 4.8%.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140040810
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