Biodiesel in diesel fuel using the Agilent 5500t FTIR by EN14078 method

Significance of the Topic

Ensuring accurate measurement of biodiesel content in diesel fuel is essential for regulatory compliance, fuel quality control, and environmental impact assessment.

Objectives and Study Overview

The study aimed to quantify biodiesel concentrations from 1% to 6% (v/v) in diesel fuel following the EN14078 standard using FTIR spectroscopy. Calibration and validation measurements were conducted on prepared standard mixtures.

Methodology and Instrumentation

Standards of biodiesel in diesel were prepared at concentrations ranging from 0.8% to 10% (v/v). Measurements were performed on an Agilent 5500t FTIR spectrometer equipped with a 100 μm Tumbler transmission cell. Spectra were collected with 32 scans at 4 cm-1 resolution. The absorbance at 1745 cm-1 was measured using a two-point baseline at 1820 cm-1 and 1670 cm-1. A calibration curve was constructed by plotting maximum absorbance versus biodiesel volume percent and processed using MicroLab software.

Main Results and Discussion

The calibration curve exhibited a linear response over the 0.8% to 10% range (R2=0.999). Absorbance values ranged from 0.15 at 0.8% to 1.63 at 10%. Prediction of sample concentrations yielded an average error of 0.129% (v/v) and a maximum error of 0.2% (v/v), demonstrating high accuracy and precision.

Benefits and Practical Applications

FTIR spectroscopy offers rapid, non-destructive analysis with minimal sample preparation. The method complies with European standards, making it suitable for quality assurance in refineries, fuel distributors, and regulatory laboratories. Integration with MicroLab software streamlines data processing and reporting.

Future Trends and Applications

Advancements may include inline FTIR monitoring for real-time fuel blending, application of chemometric models to improve detection limits, and extension to other biofuel blends. Automation and integration with laboratory information management systems (LIMS) will enhance throughput and traceability.

Conclusion

The Agilent 5500t FTIR spectrometer with a 100 μm liquid cell effectively quantifies biodiesel content in diesel fuel according to EN14078. The method delivers reliable results within the target range, supported by robust calibration and user-friendly software.

Instrumental Setup

Agilent 5500t FTIR spectrometer with 100 μm Tumbler transmission cell; MicroLab software for calibration and prediction.