Abstract
Utilizing the analytical capability to measure S isotope ratios of small quantities of S in biological material without any chemical pretreatment, the variation of δ 34S within a lichen thallus was investigated using old and young segments of fruticose lichen thalli ( Alectoria sarmentosa) from an oil refinery area in Come-By-Chance and two coastal areas, Newfoundland, Canada. Old segments of lichen samples from the oil refinery area showed significantly higher δ 34S values (1.0–2.5‰) than their corresponding young segments. Lichen samples from two coastal areas showed no noticeable differences in δ 34S values between old and young segments. These results demonstrate that lichen thalli record temporal changes in the isotopic composition of atmospheric S and hence constitute a historical archive of atmospheric S pollution.
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