Spatial Extent and Characteristics of Planosols in South-Western Ethiopian Highlands

Elias, Eyasu; Tolessa, Alemayehu Regassa; Feyisa, Gudina Legese

doi:10.2139/ssrn.3995054

Cited by 1 publication

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organic nanoparticles are negatively charged colloids, mainly due to the dissociation of hydroxyl and phenolic (∼−OH) groups, as well as carboxylic (−COOH) groups. These colloids are mostly pH-dependent because the Cation Exchange Capacity (CEC) process depends on the replacement of hydrogen; thus, CEC normally increases at higher pH values, becoming highly negative in neutral to alkaline soils . Because of highly negative charges available on the surface, the organic nanoparticles sorb/complex different positively charged organic and inorganic constituents, thus being able to store essential nutrients and a high rate of contaminants. , Additionally, organic nanoparticle colloids can associate with positively charged inorganic nanoparticles, promoting formation of colloids, thus combining the characteristics of organic and inorganic constituents at the nanoscale …”

Section: What Is a Colloid? The Definition Conundrummentioning

confidence: 99%

A Critical Look at Colloid Generation, Stability, and Transport in Redox-Dynamic Environments: Challenges and Perspectives

Spielman-Sun,

Boye,

Dwivedi

et al. 2024

ACS Earth Space Chem.

View full text Add to dashboard Cite

Colloid generation, stability, and transport are important processes that can significantly influence the fate and transport of nutrients and contaminants in environmental systems. Here, we critically review the existing literature on colloids in redoxdynamic environments and summarize the current state of knowledge regarding the mechanisms of colloid generation and the chemical controls over colloidal behavior in such environments. We also identify critical gaps, such as the lack of universally accepted cross-discipline definition and modeling infrastructure that hamper an in-depth understanding of colloid generation, behavior, and transport potential. We propose to go beyond a size-based operational definition of colloids and consider the functional differences between colloids and dissolved species. We argue that to predict colloidal transport in redox-dynamic environments, more empirical data are needed to parametrize and validate models. We propose that colloids are critical components of element budgets in redox-dynamic systems and must urgently be considered in field as well as lab experiments and reactive transport models. We intend to bring further clarity and openness in reporting colloidal measurements and fate to improve consistency. Additionally, we suggest a methodological toolbox for examining impacts of redox dynamics on colloids in field and lab experiments.

show abstract

Section: What Is a Colloid? The Definition Conundrummentioning

confidence: 99%