By comparison, Fig. 5B displays the diesel sample as monitored in the SS mFPD sulfur mode. As seen, the thianaphthene peak elutes after about 13 min amongst the bulk of the fuel components. In diesel this comprises mainly saturated and aromatic hydrocarbons,and from the 1 L volume injected, this represents nearly 1 mg of fuel flowing through the column. However, despite co-eluting with a very large amount of hydrocarbons, the analyte produces a strong response with a S/N value near 5800