Author(s)

Jian Wang, Jingtian Zhang, Qiong Xie, Fengyu Zan, Shengpeng Zuo, Shouliang Huo

College of Environmental Science and Engineering, Anhui Normal University, Wuhu, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, China.

The technique of DGT (diffusive gradients in thin films) was applied to obtain high-resolution vertical profiles of dissolved reactive phosphorus (DRP) in sediment porewater of Lake Chaohu, a shallow eutrophication lake. Three kinds of DGT probes (with three thicknesses of diffusive gel: 0.38 mm, 0.78 mm and 1.18 mm) measured vertical concentration and induced flux from solid to solution phase which had intricate variations with depth. The results indicated that higher concentrations and induced fluxes of DRP were achieved by using DGT probe with thicker diffusion layer (C_DGT1.18 > C_DGT0.78 > C_DGT0.38) and relatively stable DRP concentration profiles using DGT probes with 0.78 mm diffusive gel were obtained in each sediment core. The DRP concentrations displayed a clear gradient from Core C1 to Core C3 in sediment porewaters due to different sources and exchange degrees of reactive phosphorus. Compared to the concentrations obtained by the centrifugation technique, the concentrations of DRP resulting from the DGT technique were higher because some dissolved reactive phosphorus compounds have always been neglected using conventional centrifugation method.

Dissolved Reactive Phosphorus (DRP), Diffusive Gradients in Thin Films (DGT) Technique, Porewaters, Sediments

Wang, J. , Zhang, J. , Xie, Q. , Zan, F. , Zuo, S. and Huo, S. (2014) High-Resolution Profiles of Dissolved Reactive Phosphorus in the Porewaters of Lake Sediments Assessed by DGT Technique. Journal of Environmental Protection, 5, 694-702. doi: 10.4236/jep.2014.58070.