Analysis of Lead in Gasoline

Application Note EDXRF1442

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This application note details performance for the measurement of lead (Pb) in gasoline as per ASTM D5059.

ASTM D5059-14

Standard test methods for lead in gasoline by X-ray spectroscopy

1.    Scope

1.1    These test methods cover the determination of the total lead content of a
gasoline within the following concentration ranges:

0.010 to 5.0 g Pb/US gal
0.012 to 6.0 g Pb/UK gal
0.0026 to 1.32 g Pb/L

1.1.1 Test Methods A and B cover the range of 0.10 to 5.0 g Pb/US gal. Test Method C covers the range of 0.010 to 0.50 g Pb/US gal.

Conversion factor

1.0000 g/L = 3.7854 g/US gal = 4.5461 g/UK gal

NEX QC+ high-resolution EDXRF analyzerModel: NEX QC+


Empirical calibration was built to cover 0.0013 – 0.1321 g/L to satisfy D5059 Part C using a suite of 8 commercially available certified gasoline calibration standards.

Element Pb
Units: g/L
Standard I.D. Assay value Measured value
1 0.0013 0.0014
2 0.0026 0.0027
3 0.0053 0.0052
4 0.0090 0.0088
5 0.0132 0.0126
6 0.0264 0.0257
7 0.0793 0.0799
8 0.1321 0.1319

EDXRF1442 Correlation plot PbCorrelation plot Pb


Instrument repeatability (precision) is determined by ten repeat analyses of each sample in a static position. Actual error due to precision may be somewhat lower, as slight evaporation effects are observed during repeat analyses.

Element: Pb
Units: g/L
Sample I.D. Standard value Average value Std. dev % Relative
1 0.0013 0.0014 0.0001 9.1
5 0.0132 0.0129 0.0002 1.5
8 0.1321 0.1329 0.0007 0.5


The results shown here indicate the Rigaku NEX QC+ EDXRF analyzer can be used to satisfy ASTM D5059 -14 Part C. Given higher level calibration ranges, parts A and B can also be met.

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