Acidic condition accelerates cation release from purple rock in Southwestern China.

ABSTRACT: In spite of the fact that rock weathering performs an essential task in the evolution of the Earth's surface, the quantitative assessment between pH and rates of chemical weathering remain unclear. This study aims to characterize the chemical weathering rate of purple rocks and then develops a model to calculate the release rates of cations (K⁺, Na⁺, Ca²⁺ and Mg²⁺) under various pH conditions. Two types of purple rock were sampled from the Shaximiao Group (J₂s) and Penglaizhen Group (J₃p), and a series of laboratory experiments were performed by soaking the purple rocks in solutions with pHs from 2.5 to 7.0, over 24 treatment cycles. The results showed that the release rates of cations apparently increased as the pH decrease

SUBMITTER: Zhao J 

PROVIDER: S-EPMC9259688 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature