ASTM D3237 Test Method for Lead In Gasoline By Atomic Absorption Spectroscopy
9. Procedure
9.1 To a 50-mL volumetric flask containing 30 mL MIBK, add 5.0 mL of gasoline sample and mix.
9.1.1 Add 0.10 mL (100 µL) of iodine/toluene solution and allow the mixture to react about 1 min.
9.1.2 Add 5.0 mL of 1 % Aliquat 336/MIBK solution and mix.
9.1.3 Dilute to volume with MIBK and mix.
9.2 Aspirate the samples and working standards and record the absorbance values with frequent checks of the zero.
10. Calculation
10.1 Plot the absorbance values versus the concentration represented by the working standards and read the concentrations of the samples from the graph.
