Related Experiment Video
Updated: Jul 11, 2026

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
[Property of ammonium adsorption on sediments in ditches and adjacent soils]
Li-Hua Zhai1, Hong-Liang Liu, Hong-Deng Xu
1Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. dilh03@mails.tsinghua.edu.cn
Abstract:
Static adsorption experiments were performed to investigate the adsorption characteristics of ammonium on soils and ditch sediments. Air-dry soil, ditch sediment and wet ditch sediment were used as three kinds of sorbents. The experiments showed that the adsorption isotherms on three sorbents agreed well with linear relation and conformed to Freundlich isotherm; the adsorption ability of soil was stronger than that of ditch sediment, and for the blank ammonium concentrations of soil were higher than that of sediments. The adsorption mechanisms were related to the characteristics of interface, and ion exchange was the main adsorption function under certain concentration range. Effects of temperature on the adsorption of sorbents were observed. The results showed that the quantity of absorbed ammonium slightly decreased with the increasing of temperature under higher concentrations of ammonium.
Related Concept Videos
Basicity of Aliphatic Amines
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
Extraction: Effects of pH
Basicity of Heterocyclic Aromatic Amines
Preparation of Amines: Alkylation of Ammonia and Amines
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Common Ion Effect
Titration of a Weak Base with a Strong Acid
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...

