DGT-based Measurement of Phosphorus in Sediment Microzones and Rhizospheres (eBook)

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 C_E (effective concentration) and C_DGT 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.

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This book focuses on the development of DGT (diffusive gradientsin thin films) and the related techniques for measuring and investigating the geochemicalprocess and P transfer across the sediment/water or sediment/root interface inlakes. 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), andmicrochelex gel/LA-ICP-MS (laserablation inductively coupled plasma mass spectrometry) have been developed. The corresponding chapters on the theory andmethodology of DGT, the internal P loading or P transfer across sediment/rootin two lakes, provide insights into the research method and conclusions, includingthe P release mechanism, the quantification of internal P loading , kinetic Pexchange in DGT/sediment interface, Fe- or S(-II)-microniches at submillimeterscales in sediments for the prediction ofP release, and DGT as a surrogate for the prediction of P uptakeby roots. It alsooffers new perspectives in the fields of P analysis and P process inmicro-interfaces in lakes using DGT techniques. The P remobilization fromFe-bound P, the coupled Fe-S(-II)-P geochemical reaction and algae biomassbreakdown causing P release, are elucidated using DGT methods in sedimentlayers. DGT parameters and curves for time or distancederived from DIFS can be used to assess kinetic Prelease in the sediment microzone. CID and LA-ICP-MS methods deliver Fe- andS(-II) images at submillimeter scales, which can be used for the quantificationof flux related to microniche peaks and the prediction of P release fromFe-microniche or Fe-S(-II)-P geochemical reactions. DGT measurements in-situ inrhizosphere or rhizonbox cangive CE (effectiveconcentration) and CDGTvalues for the prediction of P accumulated in plant tissues.This book provides a valuable reference resource for senior graduatestudents, lecturers and researchers in the fields of the geochemical process ofeutrophic elements in lakes, lake eutrophication mechanism and environmental analysis.