FIELD: chemistry.
SUBSTANCE: amount of resins before and after washing with n-heptane (washed resins) is determined according to GOST 1567, and presence of a detergent additive in the motor petrol is determined from the difference in the amount of resins before and after washing with n-heptane. There are no detergent additives in the motor petrol if there is no difference between the amount of resins before and after washing with n-heptane. Conversely, if a detergent additive was added to the petrol, there is a considerable difference in the amount of resins before and after washing with n-heptane.
EFFECT: high reliability of determination.
1 tbl
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