CO2 can decrease the dissolution rate of ashed phytoliths

Nguyen, Thi Ngoc Anh; Nguyen, Anh Gia-Tuan; Pham, Nga T.T.; Nguyen, Huan X.; Dang, Quan T.; Tran, Tien Minh; Nguyen, Anh D.; Tran, Phong D.; Nguyen, Minh N.

doi:10.1016/j.geoderma.2020.114835

Cited by 9 publications

(3 citation statements)

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“…CO 2 was even more effective in decelerating the dissolution of the phytolith ashes (Fig. 3a), and this fact was in agreement with a recent nding from (Nguyen et al 2021b). The dissolution rates of the phytolith ashes declined at least by half (for Phyt400) or by about one order of magnitude (for Phyt600 and Phyt800) in presence CO 2 support.…”

Section: Discussionsupporting

confidence: 91%

“…It was observed that increasing CO 2 can reduce solution pH, intensify surface protonation, thereby preserving the surface of phytoliths from nucleophilic attacks by water molecules and anions. A marked decrease in dissolution rate was observed in response to intensifying presence of CO 2 in phytolith suspensions (Nguyen et al 2021b). This means that increasing CO 2 concentration can more or less inhibit dissolution of phytoliths.…”

Section: Introductionmentioning

confidence: 99%

“…Soil CO 2 uxes under the aerobic condition of paddy soil can reach 8.62 µmol m −2 s −1 (Liu et al 2013). A recent study revealed that the gas phase, e.g., CO 2 , can also alter dissolution rate of phytoliths (Nguyen et al 2021b). It was observed that increasing CO 2 can reduce solution pH, intensify surface protonation, thereby preserving the surface of phytoliths from nucleophilic attacks by water molecules and anions.…”

Section: Introductionmentioning

confidence: 99%

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The Regulatory Role of CO2 on Nutrient Releases from Rice-Straw Phytoliths

Nguyen

et al. 2022

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Phytolith has been widely known as a porous silica structure in numerous silicon (Si) accumulator plants, e.g., rice, that contain various nutrients and other beneficial elements too. When rice straw is returned to paddy fields, the silica structure of phytolith can be dissolved, thereby releasing its occluded nutrients. While the intrinsic characteristics and dissolution properties of phytoliths under the effect of solution chemistry have been intensively studied, the effect of gas phases, especially CO2, on phytolith stability and the implications for nutrient release are not fully known. Here, dissolution properties of phytolith ashes obtained from dry ashing of rice straw at 400, 600 and 800οC were investigated by quantifying Si release together with other nutrients under two atmospheric conditions, i.e., without and with CO2 support (aeration). In a time span of 6 days, the releases of nutrients (K, P, Ca, Mg) showed high dependence on the overall dissolution of the phytolith ashes. CO2 significantly reduced the dissolution rate of the phytolith ashes but increased the release rates of cationic as well as anionic nutrients. The aeration of CO2 shifted the carbonate equilibrium (H2CO3, HCO3− and CO32−) towards H2CO3, reducing solution pH, thereby decreasing the dissolution rate of phytoliths. Following this, intensification of H+ exchange promoted vast evacuation of cationic nutrients from the phytolith ashes. This indicates contrast responses of phytoliths and their occluded nutrients to CO2, and provides a better insight on the fate of soil phytoliths and the tendency of nutrient budgets from rice straw phytoliths in soils.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%