Objective Determining the content of sulphur dioxide residue in different drynesses of Lili bulbus,It provides experiment reference about medication safety of Lili bulbus.Methods Using pararosaniline hydrochloride method and Sodium bisulfite as index to determine remainder of sulphur dioxide in Lili bulbus.Results The remainders of sulphur dioxide in sulfurring and using coal as fuel drying Lili bulbus were exceeded.Conclusion The experiment could ...