LEAD IN GASOLINE BY ATOMIC ABSORPTION SPECTROMETRY (AAS): ASTM D3237
(Equivalent Test Method: IP 428)
EXPLANATION
This test method is applicable in the range 2.5 to 25 mg lead/L. This test method compensates for variations in gasoline composition and is independent of lead alkyl type.

TEST SUMMARY
The gasoline sample is diluted with methyl isobutyl ketone and the alkyl lead components are stabilized by reaction with iodine and a quaternary ammonium salt. The lead content of the sample is determined by flame atomic absorption spectrometry at 283.3 nm, using the standards prepared from reagent grade lead chloride. All alkyl lead compounds give identical response.

TEST PRECISION
This test method has a repeatability of 1.3 mg/L and a reproducibility of 2.6 mg/L.

This test method has been shown to have no bias.