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Bleisensor für flüchtige organische Bleiverbindungen mit direkter elektrischer Anzeige

Sensor device for volatile organic lead compounds with direct electrical signal

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Summary

Lead existing as Pb(C2H5)4 in fuels for sparkignition engines can be detected by thermal decomposition of the Pb(C2H5)4 at 200 °C to 300 °C on sensor devices. The metallic lead is deposited between two platinum electrodes and causes a strong decrease of the electrical resistance between these electrodes. The response time is approximately a few minutes. By this method 15–150 μg Pb/ml can be detected. Little amounts of oxygen (air) disturb the detection of lead, because the oxygene oxidizes the hydrocarbons of the fuel to carboxylic acids, which can contribute noticeably to the electrical conductivity. Therefore, oxygen must be removed before the temperature of decomposition is reached. This can be achieved by slow heating of the fuel, which causes the evaporating fuel to replace the oxygen (air).

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Authors and Affiliations

  1. Robert Bosch GmbH, Zentralabteilung Forschung, Schillerhöhe, D-7016, Gerlingen, Bundesrepublik Deutschland

    Detlef Baresel & Peter Scharner

Authors
  1. Detlef Baresel
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  2. Peter Scharner
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Baresel, D., Scharner, P. Bleisensor für flüchtige organische Bleiverbindungen mit direkter elektrischer Anzeige. Z. Anal. Chem. 329, 867–870 (1988). https://doi.org/10.1007/BF00471973

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  • DOI: https://doi.org/10.1007/BF00471973

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