TRANSFORMATION OF N-HETEROCYCLE, O-HETEROCYCLE, AND S-HETEROCYCLE (NOSHS) IN ESTUARINE SEDIMENTS - EFFECTS OF REDOX POTENTIAL AND SEDIMENT PARTICLE-SIZE

The transformation of 19 N-, O-, and S-heterocycles (NOSHs) was examin ed in estuarine sediment-water microcosms. The effects of redox potent ial (Eh) and sediment particle size on compound transformation rates w ere evaluated, and stable products were identified. Results from stirr ed, controlled Eh/pH microcosms (CEPMs) showed that most of the NOSHs were significantly transformed under oxidized and reduced conditions o ver 15 week incubations, and the resulting product distributions were similar. In general, the rates and extent of transformation were great er in oxidized sediments of low surface area vs. those with high parti cle surface area and reduced redox conditions. Further experiments in sealed, unstirred microcosms also showed that NOSH transformation proc eeded more slowly and on fewer compounds in fine vs. coarser grained s ediments under oxidized conditions. Unlike the stirred systems, howeve r, NOSH transformation rates were similar or greater under reduced vs. oxidized conditions. Thus, reduced, methanogenic clay of high surface area displayed some of the fastest rates of NOSH transformation. Data from liquid-liquid partitioning experiments suggested that this effec t was related to the formation of NOSH complexes with iron and perhaps other redox-active metals in sediments. Copyright (C) 1996 Elsevier S cience Ltd