NEX QC+—Analysis of Lead in Gasoline

Scope

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

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

Calibration

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.

Correlation plot Pb

Precision 

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.

Conclusion

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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