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Related Experiment Video

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Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

In Situ Ammonium Profiling Using Solid-Contact Ion-Selective Electrodes in Eutrophic Lakes.

Rohini Athavale^1,2, Ilga Kokorite^1,3,4, Christian Dinkel¹

¹Department of Surface Waters Research and Management Eawag-Swiss Federal Institute of Aquatic Science and Technology , Seestrasse 79, CH-6047 Kastanienbaum, Switzerland.

Analytical Chemistry

|November 19, 2015

Summary

This summary is machine-generated.

A new lake profiling setup using solid-contact ion-selective electrodes (SC-ISEs) enables high-resolution in situ measurements. It successfully identified ammonium hotspots and gradients, revealing fine-scale biogeochemical processes.

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Area of Science:

Environmental Science
Analytical Chemistry
Limnology

Background:

In situ measurements in lakes are crucial for understanding biogeochemical processes.
Conventional sampling methods can miss fine-scale features.
Solid-contact ion-selective electrodes (SC-ISEs) offer potential for advanced in situ monitoring.

Purpose of the Study:

To present a novel profiling setup for in situ lake measurements using SC-ISEs.
To develop a data processing method for sensor calibration and drift correction.
To investigate the potential for high-resolution profiling of ammonium concentrations in a eutrophic lake.

Main Methods:

Developed a profiling setup with a logging system, syringe sampler, and standard environmental sensors.
Integrated potentiometric SC-ISEs for ammonium measurement.
Deployed the setup in Lake Rotsee and compared two SC-ISE designs.

Main Results:

One SC-ISE design (carbon-nanotube-PVC) suffered from sulfide poisoning.
A plasticizer-free methacrylate copolymer-based SC-ISE design showed no poisoning.
Online monitoring identified reaction hotspots and steep ammonium gradients.
High-resolution concentration profiles revealed features missed by conventional methods.

Conclusions:

The presented profiling setup with SC-ISEs is effective for high-resolution in situ lake measurements.
Plasticizer-free methacrylate copolymer-based SC-ISEs are robust against sulfide poisoning.
This technology facilitates the study of centimeter-scale biogeochemical processes in lakes.