DGT-based Measurement of Phosphorus in Sediment Microzones and Rhizospheres

  • Shengrui Wang
  • Zhihao Wu

Table of contents

  1. Front Matter
    Pages i-xxvii
  2. The Basic Theory and Methodology

    1. Front Matter
      Pages 1-1
    2. Shengrui Wang, Zhihao Wu
      Pages 27-38
    3. Shengrui Wang, Zhihao Wu
      Pages 39-72
  3. “Internal P-Loading” at SWI of Dianchi Lake

  4. The P-behavior at the Interface of Sediment/Root of Aquatic Plants (Erhai Lake)

    1. Front Matter
      Pages 123-123
    2. Shengrui Wang, Zhihao Wu
      Pages 163-170

About this book


This book focuses on the development of DGT (diffusive gradients in thin films) and the related techniques for measuring and investigating the geochemical process and P transfer across the sediment/water or sediment/root interface in lakes. A series of DGT techniques such as new types of probes, test methods in sediment or the rhizosphere, DIFS (DGT induced fluxes in sediments and soils) model for kinetic P exchange, CID (computer imaging densitometry) for S(-II), and microchelex gel/LA-ICP-MS (laser ablation inductively coupled plasma mass spectrometry) have been developed.

The corresponding chapters on the theory and methodology of DGT, the “internal P loading” or P transfer across sediment/root in two lakes, provide insights into the research method and conclusions, including the P release mechanism, the quantification of “internal P loading”, kinetic P exchange in DGT/sediment interface, Fe- or S(-II)-microniches at submillimeter scales in sediments for the prediction of P release, and DGT as a surrogate for the prediction of P uptake by roots.

It also offers new perspectives in the fields of P analysis and P process in micro-interfaces in lakes using DGT techniques. The P remobilization from Fe-bound P, the coupled Fe-S(-II)-P geochemical reaction and algae biomass breakdown causing P release, are elucidated using DGT methods in sediment layers. DGT parameters and curves for time or distance derived from DIFS can be used to assess kinetic P release in the sediment microzone. CID and LA-ICP-MS methods deliver Fe- and S(-II) images at submillimeter scales, which can be used for the quantification of flux related to microniche peaks and the prediction of P release from Fe-microniche or Fe-S(-II)-P geochemical reactions. DGT measurements in-situ in rhizosphere or rhizonbox can give CE (effective concentration) and CDGT values for the prediction of P accumulated in plant tissues.

This book provides a valuable reference resource for senior graduate students, lecturers and researchers in the fields of the geochemical process of eutrophic elements in lakes, lake eutrophication mechanism and environmental analysis.


Sediment/water Internal Phosphorus Loading Diffusive Gradients in Thin Films Rhizosphere Microniche LA-ICP-MS

Authors and affiliations

  • Shengrui Wang
    • 1
  • Zhihao Wu
    • 2
  1. 1.Environmental SciencesChinese Research Academy ofBeijingChina
  2. 2.Environmental SciencesChinese Research Academy ofBeijingChina

Bibliographic information