Automated Analysis of Zinc in Lubricating Oils
Author Information
Author(s): Gustavo Pignalosa, Moisés Knochen, Noel Cabrera
Primary Institution: Facultad de Química, Universidad de la República
Hypothesis
Can flow-injection analysis with syringe injection improve the determination of zinc-based additives in lubricating oils?
Conclusion
The automated method using a motorised syringe for sample injection effectively determines zinc in lubricating oils with results comparable to standard methods.
Supporting Evidence
- The method showed no significant differences compared to the ASTM method at the 95% confidence level.
- Precision was better than 5% for high concentrations and typically 2%.
- The system achieved a sampling frequency of about 30 samples per hour.
Takeaway
This study shows a new way to test oil for zinc using a special machine that makes it easier and faster to get accurate results.
Methodology
The study used a flow-injection system with a motorised syringe to inject oil samples into a kerosene stream for analysis by atomic absorption spectrometry.
Limitations
The method may have limitations in precision at low concentrations due to the nature of the samples.
Statistical Information
P-Value
p<0.05
Confidence Interval
95%
Statistical Significance
p<0.05
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