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Sulfur was determined in Parmelia sulcata and P. chlorochroa by combustion of the sample and infrared detection of evolved sulfur dioxide using an automated sulfur analyzer.Vanadium pentoxide was used as a combustion accelerator. Pelletization of the sample prior to combustion was not found advantageous. Washing studies showed that leaching of sulfur was not a major factor in the sample preparation.The combustion-IR analysis usually gave higher sulfur content than the turbidimetric analysis as well as shorter analysis time.Relative standard deviations of less than 7% were obtained by the combustion-IR technique when sulfur levels in lichens ranged from 0.05-0.20%.Determination of sulfur in National Bureau of Standards orchard leaves standard reference material showed good agreement between the combustion-IR technique and other instrumental procedures.

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