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.
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
Model: NEX QC+
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.
| 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 |
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.
| 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 |
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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