Analysis of Neutralization of Acidic Precipitation with Soil.

Chohji, Tetsuji; Nakagawa, Chie; Hirai, Eiji

doi:10.1252/kakoronbunshu.19.795

Cited by 3 publications

(1 citation statement)

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“…In this study, the pH in L T and L S presented similar oscillatory changes over time, and the pH in the L S was higher than it was in the L T . It is worth noting that when soil is irrigated with acid water, soil pH increases, probably attributed to the combined buffering effect of the irrigation water and soil [ 35 , 36 ]. As shown in Figure 3 , the pHs in L T and L S were closely related to the changes in ORP and showed a very significant negative correlation with ORP ( p < 0.01).…”

Section: Resultsmentioning

confidence: 99%

The Aging Process of Cadmium in Paddy Soils under Intermittent Irrigation with Acid Water: A Short-Term Simulation Experiment

Han

Pei

Huang

et al. 2022

IJERPH

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Cadmium (Cd)-contaminated paddy soils are a big concern. However, the effect of irrigation with acid water on the migration and transformation of Cd and the effect of alternating redox conditions caused by intermittent irrigation on Cd aging processes in different depths of paddy soils are unclear. This study revealed Cd fractionation and aging in a Cd-contaminated paddy soil under four irrigation periods with acid water and four drainage periods, by applying a soil columns experiment and a sequential extraction procedure. The results showed that the dynamic changes of soil pH, oxidation reduction potential (ORP), iron (Fe) oxides and dissolved organic carbon (DOC) throughout the intermittent irrigation affected the transformation of Cd fractions. After 32 days, the proportion of exchangeable Cd (F1) to the total Cd decreased with a reduction of 24.4% and 20.1% at the topsoil and the subsoil, respectively. The labile fractions of Cd decreased, and the more immobilizable fractions of Cd increased in the different depths of soils due to the aging process. Additionally, the redistribution of the Fe and Mn oxide-bound Cd (F3) and organic matter and secondary-sulfide-bound Cd (F4) occurred at different depths of soils during the incubation time. Overall, the bioaccessibility of Cd in the subsoil was higher than that in the topsoil, which was likely due to the leaching and accumulation of soluble Cd in the deep soil. In addition, the aging processes in different depths of soils were divided into three stages, which can be mainly described as the transformation of F1 into F3 and F4.

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Section: Resultsmentioning

confidence: 99%