Evaluation of Sequential Extraction Procedure (SEP) to Validate Binding Mechanisms in Soils and Soil-Nano-Calcium Silicate (SNCS) Mixtures

Kotresha, K.; Mohammed, Syed Abu Sayeed; Sanaulla, P. F.; Moghal, Afzal Ali Baig; Moghal, Arif Ali Baig

doi:10.1007/s40098-020-00464-w

Cited by 14 publications

(3 citation statements)

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“…As noted above, Cd is adsorbed more effectively by the organic matter than the Fe and Mn hydrous oxides at lower soil pH levels characteristic of cocoa soils. Because this fraction is associated with stable humic substances of high molecular weight, which reduces the mobility and release of Cd (Kotresha et al, 2021). This is also re ected in Table 5, with the fraction associated with organic matter having the strongest negative relationship, indicating that these forms, as well as those associated with manganese oxides, are not translocated to the bean and it could be deduced that the increase of this fraction will reduce the contents of the element in the bean.…”

Section: Discussionmentioning

confidence: 78%

“…Different studies indicate that contaminants such as Cd are initially delayed, but after a period active ingredients in the soil cause it to react and be released back into the environment (Kotresha et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…5, while at higher pH values it becomes insoluble in forms of carbonate and phosphate, which could explain why, despite the high Cd content in carbonates, this fraction according to the spatial model of the error does not explain the cadmium contents in the cocoa bean (Kabata-Pendias & Pendias, 2000), taking into account that according toKotresha et al (2021), this is one of the most unstable fractions because it is in uenced by the variation of environmental conditions. favor any of its forms, such as the acidic conditions present in the rhizosphere which increase during the respiration process, where carbonic acid dissociates releasing H + and HCO 3− , allowing a rapid adsorption of Cd 2+ and without energy expense, through the epidermal cells of the root, via apoplast, related to the exchange of H +(Yamaguchi et al, 2011, Kabata-Pendias & Sadurski, 2004).…”

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confidence: 99%

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Statistical impact of the cadmium forms on element content in cocoa bean in Colombia

Albarracín

Darghan

Rivera

2023

Preprint

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Cocoa is a staple crop for small farmers, has been promoted as an alternative crop to Erythroxylum coca. Some soils in the Colombian cocoa zone seem to accumulate high levels of Cd in the beans. To comprehend the relationship between different Cd forms and their phytoavailability in the beans, cocoa-producing farms were sampled located in Yacopi municipality using sequential extraction methods to estimate the forms of Cd present in the soil, its phytoavailability and leaching potential. The exchangeable fractions, carbonate, manganese oxide, organic matter, amorphous iron oxide, crystalline iron oxide and residual fraction were determined. It was observed that the highest Cd concentrations were found in the organic matter, carbonate, Mn oxides and amorphous Fe phases, and the lowest in the exchangeable, crystalline Fe oxide and residual fractions. It was obtained through spatial regression that the Cd fractions that explain the Cd contents in beans correspond to the exchangeable ones, associated with manganese oxides, organic matter, crystalline iron oxides and residual fraction, which were fitted to a spatial error model. Modeling indicated that direct and positive impacts of the Cd content in the bean with the exchangeable and residual fractions, and negative impacts with the organic matter and manganese oxides fractions, which shows that these forms are retained in the colloidal phase and are not translocated to the bean, so that variations in the content of these fractions could contribute to a reduction in the Cd content in the bean.

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Section: Discussionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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