Chemistry: analytical and immunological testing – Tracers or tags
Patent
1992-10-29
1993-09-14
Housel, James C.
Chemistry: analytical and immunological testing
Tracers or tags
436 60, 436139, 436178, 422 8205, 422101, G01N 3508
Patent
active
052448096
ABSTRACT:
The concentration of detergent additives and the like in motor gasoline and similar liquid petroleum fuels is measured by evaporating a sample of the fuel and passing the sample through a light-scattering detector to measure the concentration of unevaporated particles of high molecular-weight, low volatility material present in the additive concentrate. A gasoline sample may be passed through the detector by a transport medium comprising one of heptane and iso-octane. Photo detector signals generated by the additive-containing sample are compared with signals detected with samples not containing any additive. The sample and the transport medium are condensed after analysis. The method is fast, does not require venting of volatile hydrocarbon fluids to atmosphere and may be carried out using a minimal quantity of fuel product as the sample.
REFERENCES:
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patent: 4009008 (1977-02-01), Orelup
patent: 4084091 (1978-04-01), Thomas
patent: 4514503 (1985-04-01), Orelup
patent: 4717671 (1988-01-01), Melpolder
patent: 4918020 (1990-04-01), Nowak
Atlantic Richfield Company
Bhat N.
Housel James C.
Martin Michael E.
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