Fate and Effects of N-, O-, and S-Heterocycles (NOSHs) from Petroleum andPyrogenic Sources in Marine Sediments. University Research Initiative

摘要

The chemistry and transformation pathways of N-, O-, and S- heterocycles (NOSHs)were studied in estuarine sediment-water microcosms. The effects of redox potential (Eh) and sediment particle size and NOSH degradation were examined in three sediments, and NOSH transformation products were identified. Selected NOSH compounds were synthesized in deuterated form, and tracer experiments were conducted to confirm the product analyses and postulate mechanisms of degradation and toxicity. Microbes degrading the NOSHs were isolated, characterized, and used in pathway determination. Results from stirred microcosms showed that most of the 19 NOSHs examined were transformed under both oxidized and reduced conditions, and the transformation product distributions were very similar in all treatments.