『Abstract
　Three undisturbed sediment samples were collected from the intertidal zone of the Jiaojiang Estuary of Zhejiang Province, China. The sediments were found to contain remarkably low concentrations of organic carbon (＜0.6％) and acid volatile sulfide (AVS) 8＜30 μmol g^-1). The availability of these two substrates likely constrained sulfate reduction and pyritization of several trace metals, respectively. This was especially true at one station where AVS concentrations in the upper 20 cm averaged less than 0.05μmol g^-1. Although the depth dependence of the degree of trace metal pyritization was generally consistent with expectations based on redox conditions, depth profiles of reactive-metal and pyrite-metal concentrations in several cases revealed more complex behavior and a positive correlation between reactive-metal concentrations and pore water metal concentrations.

Keywords: Estuarine sediments; Trace metals; Reactive fraction; Pyrite fraction; Jiaojiang Estuary of Zhejiang of China』

Introduction
Description of the study area
Materials and methods
Results
Discussion
Conclusions
Acknowledgments
Open access
References