Chemistry: electrical and wave energy – Processes and products
Patent
1981-05-26
1982-08-03
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204195R, 324425, 324439, G01N 2726
Patent
active
043426280
ABSTRACT:
In the preferred embodiment, an electrochemical method of detecting the presence of tetraalkyl lead (or other organometallic antiknock additive) in an automotive gasoline sample comprises contacting the gasoline with an immiscible methanol solution containing KOH, which solution is the electrolyte of an electrochemical cell. The cell includes a stainless steel anode and a zinc cathode. Tetraalkyl lead is extracted from the sample into the methanol solution and metallic lead is deposited onto the zinc cathode. Thus, the lead deposit is evidence of the presence of tetraalkyl lead in the gasoline. The method is preferably adapted to be carried out on board a vehicle to monitor the fuel used therein.
Devices are presented which are adapted to be incorporated into the fuel tank or fuel line of a vehicle for detecting tetraalkyl lead by this method. In one embodiment, the detection device features a cathode comprising two closely spaced zinc surfaces. A predetermined amount of lead forms a continuous deposit between the zinc surfaces, which deposit is readily detected by a decrease in the electrical resistance between the zinc surfaces.
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Fekete Douglas D.
General Motors Corporation
Kaplan G. L.
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