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A new method of determination of chemical stability of automobile gasolines based on the proportion of absorbed oxygen (PAO) is proposed. Storage test results are used to formulate the chemical stability requirements for prolonged gasoline storage and to determine the standard PAO values.For organizations that store automobile gasolines for a prolonged period, a pressing task is prevention of deterioration in gasoline quality below what is specified by the normative documents until the storage expiry time. Determination of the level of potential tendency for oxidation of each batch of stored gasolines will help achieve this task.It is customary to assess the potential tendency of automobile gasolines for oxidation from the induction period [GOST (Federal State Standard) R 52068-2003] or from the total content of oxidation products (G0ST 22054-76) [1]. But these methods do not allow reliable prediction of the gasoline storage period and have several other deficiencies that impede their use in laboratories of petroleum products supplying organizations [1-3].In order to eliminate their intrinsic deficiencies and to determine the possible automobile gasoline storage period, a new chemical stability determination method was developed.As is well known, oxidation of hydrocarbons under storage conditions occurs in the liquid phase with absorption of oxygen [1, 2], so the amount of oxygen absorbed by the gasoline under test conditions is the most objective information parameter of its chemical stability.In order to determine the chemical stability from the proportion of absorbed oxygen, an installation based on GOST 52068-2003 was used as the experimental one after its modification: · a leak-proof metallic bomb fitted with a valving system, a device for oxygen supply, and a pressure gage; · a glass vessel for the test specimen with a lid that allows free access of oxygen to the specimen;· a liquid thermostat for maintaining the temperature at the 120 ± 1°C level; and · steel cylinders containing 98-99% oxygen under pressure.

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