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Related Experiment Video

Updated: Aug 4, 2025

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

Legacy contributions to diffuse water pollution: Data-driven multi-catchment quantification for nutrients and carbon.

Jacopo Cantoni¹, Zahra Kalantari², Georgia Destouni¹

¹Department of Physical Geography, Stockholm University, SE-106 91 Stockholm, Sweden.

The Science of the Total Environment

|March 31, 2023

Summary

Legacy pollutants significantly impact water quality, hindering improvements despite regulations. This study reveals their dominant contribution to total nitrogen (TN), total phosphorus (TP), and total organic carbon (TOC) pollution across Sweden.

Keywords:

Eutrophication Groundwater Land use Legacy sources Streams Water browning

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Last Updated: Aug 4, 2025

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

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Published on: September 26, 2017

Capturing Flow-weighted Water and Suspended Particulates from Agricultural Canals During Drainage Events

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Published on: July 24, 2016

Area of Science:

Environmental Chemistry
Hydrology
Ecotoxicology

Background:

Water quality improvements often fall short despite regulatory efforts.
Legacy pollutants, persisting in the environment, are increasingly implicated in these failures.
Understanding pollutant sources is crucial for effective mitigation strategies.

Purpose of the Study:

To investigate the role of legacy pollutants in water quality degradation.
To quantify the contribution of legacy sources to total nitrogen (TN), total phosphorus (TP), and total organic carbon (TOC) loads.
To establish relationships between land use and legacy pollutant concentrations.

Main Methods:

Utilized multi-catchment data from Sweden.
Employed mechanistically-based source distinction models relating water discharge to chemical concentrations and loads.
Analyzed relationships between legacy pollutant concentrations and land use shares (agriculture, forests).

Main Results:

Legacy pollutants were found to be dominant contributors to TN, TP, and TOC.
These findings were consistent across various catchment scales, from local to national.
Strong correlations were observed between legacy TN/TOC concentrations and agricultural/forest land shares.

Conclusions:

Legacy pollutants play a significant role in water quality issues, challenging current mitigation approaches.
The data-driven approach effectively distinguishes and quantifies legacy pollutant contributions.
Further research should explore these methods for other chemicals and global sites to enhance pollution control.