The Sulfur in Isooctane calibration set is primarily used to create calibration curves for gasoline. The concentrations of the unknown samples must lie within the calibration range that is used.Ayalytical Instruments supplies calibration samples in various concentrations - blank, 1, 5, 10, 25, 100, and 500ppm. The set contains seven 100mL bottles, in accordance with ASTM method D2622.