Effect of pH on the surface charges of permanently/variably charged soils and clay minerals.

ABSTRACT: Traditionally, the surface charge number (SCN) of permanently charged soils/clay minerals is believed to be unaffected by environmental pH. However, recent studies have revealed the occurrence of polarization-induced covalent bonding between H⁺ and the surface O atoms of permanently charged clay minerals. This discovery challenges the traditional notions of "permanently charged soil" and "permanently charged clay mineral". The purpose of this study is to confirm that there are no true "permanently charged clay" or "permanently charged soil". In this study, the SCNs of two permanently charged clay minerals, two variably charged clay minerals, five permanently charged soils (temperate soils), and four variably charged soils (tropical or subtropical soils) were measured at differen

SUBMITTER: Cao H 

PROVIDER: S-EPMC11455935 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature