1.1 ,This test method covers the determination of mercaptan sulfur in gasolines, kerosines, aviation turbine fuels, and distillate fuels containing from 0.0003 ,% to 0.01 ,% by mass ,of mercaptan sulfur. Organic sulfur compounds such as sulfides, disulfides, and thiophene, do not interfere. Elemental sulfur in amounts less than 0.0005 ,% by mass , does not interfere. Hydrogen sulfide will interfere if not removed, as described in 9.2.