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48 May / June 2021 Table 1 Run


1 2


3 4 5 6 7 8 9


10


Average Min Max


stdev RSD


Table 2


Compound 1 C16:0 C16:1 C18:0 C18:1 C18:2 C18:3 C20:0 C20:1 C22:0 C22:1


Table 3


Name FAME


Amount Percent (% v/v) 6.78*


Target values (% v/v) 6.91


*Converted from % m/m to % v/v, using sample density = 831.4 g/L and FAME density = 874 g/L


products- Determination of aromatic hydrocarbon types in middle distillates- High performance liquid chromatography method with refractive index detection).


The differences between measurements done using the AC GCxGC application and measurements done using the HPLC- RI method EN12916, stayed well within EN12916 reproducibility limits for all samples and standards. The results and accepted reproducibility limitation are displayed in Figure 6.


The total FAME content and the FAME speciation have been validated by comparing the results with known diesel B7 values measured by EN14078 [2] (CEN


- Technical Bodies) analysis (Determination of FAME content in middle distillates by Infrared spectrometry). The determined values of total FAME % (m/m) (Table 2) converted to % (v/v) show that the found values measured by the GCxGC application are within the reproducibility of the EN14078 method (Table 3).


Conclusion


The AC GCxGC group-types in diesel and jet fuel application provides detailed insight into the composition of jet fuels & diesels using a rugged, low-maintenance hardware setup. Individual component and group type results are highly repeatable


and accurate. The regulatory important result for total aromatics corresponds well to the existing method EN12916. Additionally, the application is also an excellent tool for determining speciated and total FAME content of biodiesel fuel products. The measured values for FAME content are within the reproducibility values of the compared method. Besides offering detailed group-type breakdown, the GCxGC application allows the user to expand its applicability to quantify selected individual components such as benzene, toluene, ethylbenzene and xylene (BTEX) content.


Because the mechanical complexity of the modulator has been significantly reduced,


repeatability (EN14078) Reproducibility (EN14078) 0.095


0.510 2 0.481 0.481 0.15 3 0.48 4 5 0.484 0.483 6 0.48 7 0.48 8 9 0.481 0.483 0.483


0.115 0.115 0.116 0.116 0.115 0.115 0.115 0.115 0.115 0.116 0.15


4.259 4.259 4.258 4.273 4.264 4.229 1.31


1.31


0.535 0.535 0.08


0.08


0.543 0.542 0.537 0.541 0.544 0.541 0.544 0.081 0.081 0.081 0.081 0.082 0.083 0.081 0.081


1.316 0.54


0.116 0.116 0.118 0.118 0.118 0.117 0.119 0.128 0.118 0.119 0.032 0.032 0.033 0.032 0.033 0.033 0.033 0.033 0.033 0.033 0.03


0.03 0.032 Total FAME 7.109 7.109 7.125


0.03 7.15


0.031 0.031 0.032 0.034 0.032 0.031 7.138 7.081 7.115 7.145 7.126 7.154


1.32


0.152 0.153 0.152 0.151 0.151 0.152 0.151 0.153 4.25


1.317 1.307 1.313 1.316 1.316


4.259 4.255 4.274 1.32


10 Average stdev RSD 0.48 0.0015 0.32% 0.11 0.0004 0.34% 0.15 0.0012 0.79% 4.25 0.0127 0.30% 1.31 0.0043 0.33% 0.54 0.0033 0.61% 0.08


0.001 1.28%


0.11 0.0035 2.92% 0.03 0.0006 1.76% 0.03 0.0012 3.95% 7.13 0.0225 0.32%


FAME


Concentration in % m/m 7.27


7.27 7.29 7.31 7.3


7.24 7.29 7.31 7.3


7.32 7.29 7.24 7.32


0.023 0.31%


Paraffins


Concentration in % m/m 32.53


32.49 32.49 32.47 32.45 32.47 32.43 32.43 32.43 32.42 32.46 32.42 32.53 0.037 0.12%


n-Paraffins


Concentration in % m/m 15.30


15.34 15.34 15.28 15.27 15.26 15.27 15.36 15.26 15.25 15.29 15.25 15.36 0.040 0.26%


Naphthenes Concentration in % m/m 35.18


35.14 35.12 35.19 35.18 35.19 35.15 35.16 35.18 35.22 35.17 35.12 35.22 0.029 0.08%


1R aromatics Concentration in % m/m 23.73


23.78 23.77 23.74 23.76 23.79 23.79 23.78 23.77 23.75 23.77 23.73 23.79 0.021 0.09%


2R aromatics Concentration in % m/m 1.29


1.32 1.33 1.29 1.31 1.31 1.34 1.32 1.32 1.29 1.31 1.29 1.34


0.016 1.23%


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