Novel simple method for quantitation of nitrogen compounds in middle distillates using solid phase extraction and comprehensive two-dimensional gas chromatography

► Identification and quantitation of N-compounds in middle distillates is achieved. ► The method is based on SPE fractionation followed by GC × GC-NCD. ► The fractionation avoids the overlapping between basic N-compounds. ► Results were compared with ASTM-4629 reference method and they closely resemble. ► The method provides a distribution of organic N-compounds in middle distillates.