NEX DE—Analysis of ULSD
Scope
The analysis of sulfur in ULSD (ultra-low sulfur diesel) is demonstrated.
Background
Regulations around the world have limited the amount of sulfur in various fuels oils with particular attention to diesel fuel. For many years, road diesel has been limited to a maximum sulfur concentration between 10 – 15 ppm, depending on the global region. Now these limits are expanded to all diesel fuel, including use in large engines and off-road diesel engines.
Model: NEX DE
ASTM and international norms
The Rigaku NEX DE EDXRF analyzer meets several international norms for the measurement of sulfur in petroleum oils, fuels, and ULSD using EDXRF.
| Standard method | Sulfur range |
| ISO 13032 | 8 – 50 mg/kg |
| ASTM D4294 | 16 mg/kg – 5% |
| IP 532 | 6 – 50 mg/kg |
| EN ISO 8754 | 300 mg/kg – 5% |
| EN ISO 20847 | 30 – 500 mg/kg |
Calibration
Empirical calibration was built using a suite of 6 commercially available certified diesel calibration standards.
| Element: S Units: ppm |
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| Sample I.D. | Standard value | Calculated value |
| STD 1 | 5.0 | 4.72 |
| STD 2 | 10.0 | 10.00 |
| STD 3 | 15.0 | 14.69 |
| STD 4 | 20.0 | 20.42 |
| STD 5 | 25.0 | 25.03 |
| STD 6 | 50.0 | 49.83 |
Calibration plot S
Precision
Instrument repeatability (precision) is determined by ten repeat analyses of a sample in static position.
| Element: S Units: ppm |
||||
| Sample | Standard value | Average value | Std. dev | % Relative |
| STD 1 | 5.0 | 4.75 | 0.30 | 6.0 |
| STD 2 | 10.0 | 10.12 | 0.21 | 2.1 |
| STD 3 | 15.0 | 15.09 | 0.22 | 1.5 |
Conclusion
The results shown here indicate the Rigaku NEX DE EDXRF analyzer gives excellent performance for the measurement of ULSD. The multi-element versatility of the NEX DE also makes it an ideal tool for the measurement of many other elements and oils, such as Ca and the metals V, Fe, and Ni in crude in residual oils.
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