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Related Experiment Video

Updated: May 6, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

Nitrate reduction activity in a continuous flow-through system in marine sediments.

J L Esteves¹, G Mille, F Blanc

¹Centrao National Patagonico (CONICET), 28 de Julio n∘28-(9.120), Puerto Madryn, Argentine.

Microbial Ecology

|November 12, 2013

Summary

Coastal marine sediment nitrate reduction was measured using a simple flow-through system. The study found nitrate uptake follows Michaelis-Menten kinetics, providing key kinetic parameters for this important marine process.

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Published on: August 3, 2016

Area of Science:

Marine Ecology
Biogeochemical Cycles
Environmental Science

Background:

Nitrate reduction is a critical process in coastal marine sediment biogeochemistry.
Understanding nitrate uptake kinetics is essential for modeling nutrient cycling in marine ecosystems.

Purpose of the Study:

To measure nitrate reduction rates in coastal marine sediment.
To characterize the kinetics of nitrate uptake using an open flow-through system.
To evaluate the efficiency and applicability of the flow-through method.

Main Methods:

Utilized an open flow-through system to measure nitrate reduction.
Investigated the influence of nitrate concentration, sediment weight, and dilution rate.
Applied Michaelis-Menten kinetics to analyze nitrate uptake data.

Main Results:

Nitrate reduction rates were dependent on nitrate concentration.
Rates were largely independent of sediment weight (14-35 g) and dilution rate (0.7-5 h⁻¹).
Michaelis-Menten parameters (Km = 78 μM, Vmax = 0.168 μmol g⁻¹ h⁻¹) were determined and agreed with previous studies.

Conclusions:

The open flow-through system provides a fast, simple, and inexpensive method for measuring nitrate reduction.
The determined kinetic parameters are valuable for understanding nitrogen cycling in coastal sediments.
The method requires only small sediment quantities (∼10 g), enhancing its practicality.