Sequential extraction of calcium in lake sediments for investigating the cycle of phosphorus in water environment

He, J.; Liu, G. L.; Zhu, Duanwei; Cai, Jianbo; Zhou, Wenbing; Guo, Wenkai

doi:10.1007/s13762-013-0490-y

Cited by 8 publications

(3 citation statements)

References 47 publications

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“…Moreover, prior to any remediation to replenish Mg in soil, the SEP can provide additional understanding of solubility, availability, and precipitation of Mg; and this information can enable reliable evaluation of the metal elements in soil [12]. Although the SEP was originally developed for the assessment of trace elements, the approach has already been accepted successful in evaluating other elements linked to soil fertility, such as P [16], Ca [17], K [11], and Mg [18,19]. The fractionation of Mg in soil reveals different levels of Mg reserves in various forms of existence and, therefore, signifies the potential bioavailability of Mg in soil.…”

Section: Introductionmentioning

confidence: 99%

Magnesium fractionation in different textural groups and commercial crop cultivations of Thai soils

Ntlopo¹,

Onthong²,

Poonpakdee³

2022

ScienceAsia

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Thai soils are dominated by extremely weathered and developed Ultisols that are characterized by acidity, low fertility, and high leaching of basic cations, including magnesium (Mg). In this study, the distribution of Mg chemical fractions in Thai soils and major commercial crop fields was assessed using sequential extraction. Moreover, the status of available soil Mg was estimated using single leaching. Similar distribution patterns of Mg fractionation in the inorganic soils and the commercial crop cultivation soils were noticed. The mean percentage distributions of Mg fractions spread in a decreasing magnitude: the mineral Mg > the available Mg > the carbonate Mg > the organic complexed Mg; and the recorded values were 68.43, 22.81, 5.90, and 2.86 in the inorganic soils and 69.67, 23.60, 4.52, and 2.21 in the commercial crop cultivation soils, respectively. A distinct Mg fractionation pattern occurred within organic soils with a spread percentage of 71.79, 14.68, 8.91, and 4.62 for available Mg, organic complexed Mg, mineral Mg, and carbonate Mg, respectively. The available Mg concentration within organic soils was 541.21 mg/kg; while the inorganic soils per textural group produced 510.86, 26.87, and 20.89 mg/kg in fine, medium, and coarse textured soils, respectively. Among the commercial crop cultivation soils, rice and coconut were grown in soils with adequate Mg; whereas oil palm, durian, longkong, and rubber were cultivated in Mg deficient soils. Mg is an essential element in plants; therefore, medium, coarse textured soils, and the extremely weathered tropical Ultisols, regardless of their texture, require Mg replenishment for optimum plant productivity within the tropics.

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Section: Introductionmentioning

confidence: 99%

Magnesium fractionation in different textural groups and commercial crop cultivations of Thai soils

Ntlopo¹,

Onthong²,

Poonpakdee³

2022

ScienceAsia

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“…Many physiological plant disorders have been correlated with Ca 2þ deficiency (Maynard 1979). The transport processes and bioavailability of Ca 2þ relies intensely on its available species (Dauer and Perakis 2013;He et al 2015). Soil containing low available Ca 2þ is one of major factors resulting in Ca deficiency of plants (Behling et al 1989).…”

Section: Introductionmentioning

confidence: 99%

In-situ sampling of available calcium using diffusive gradients in thin-films technique based on benzo-crown ether-functionalised silica as the binding agent

You

Cao

et al. 2018

Environ. Chem.

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Environmental contextLow availability of calcium (Ca2+) in soils is one of the major factors in Ca2+ deficiency of plants and physiological plant disorders. A device based on functionalised silica was developed for in-situ measurement of the available Ca2+ in soils. Application of the proposed device to measure available Ca2+ may help to develop and improve agricultural practices. AbstractCalcium is an ion of particular interest due to its importance in plant nutrition and soil structure. A novel device of diffusion gradients in thin-films (DGT) based on the benzo-crown ether-functionalised silica (BCES) as the binding agent and the polyethersulfone (PES) membrane as diffusive layer (BCES-DGT) was developed for in-situ sampling of available calcium (Ca2+) in freshwater and soil samples. The performance characteristics of the BCES-DGT device were assessed. The BCES was prepared using the sol-gel process and characterised by Fourier transform infrared spectroscopy, scanning electron microscopy, thermal gravimetric analysis and N2 adsorption–desorption. Results evinced that BCES was obtained successfully with a rough wrinkled surface and good specific surface area of 111.3 m2 g−1. The diffusion coefficient of Ca2+ ions in PES membrane was found to be 1.23 × 10−6 cm2 s−1 at 25 °C and was independent of pH in the range of 3–10 and ionic strength (as pNaCl) from 1 to 3. The high binding capacity of BCES binding gel for Ca2+ ions was determined to be 9822.4 ± 452.9 μg Ca2+/disk and was conducive to the deployment of long-term or high concentration. The BCES-DGT device can accurately measure the concentrations of Ca2+ over wide ranges of ionic strengths (1–3 as pNaCl) and pH (5–10). There was no significant interference on the uptake of Ca2+ by the BCES-DGT device at the tolerance limits up to 500 for Mg2+, Li+, HCO3−, H2PO4−, NO3− and SO42−, 250 for Sr2+, 2000 for K+ and 50 for fulvic acid. The results from BCES-DGT device were in excellent agreement with those measured directly using ion selective electrode in several water and soil samples. Field application in river water indicated that a good agreement was obtained between BCES-DGT value and mean grab sample measurements of Ca2+ and that the relative standard deviation of BCES-DGT measurement (4.7 %) was superior to that of grab sample measurements (13.5 %), suggesting that BCES-DGT was reliable for in-situ sampling and measurement of available Ca2+ with good accuracy and precision.

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“…Sequential extraction is still very popular today due to its low costs and high accessibility as compared to the other analytical methods for solid phases. In 2014 and 2015, there are still a number of new SE schemes for trace elements were proposed (Al-Hwaiti et al, 2014;Drahota et al, 2014;Rinklebe and Shaheen, 2014;Shaheen and Rinklebe, 2014;Unsal et al, 2014;He et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

An optimised sequential extraction scheme for the evaluation of vanadium mobility in soils

Huang

Brandl

2017

Journal of Environmental Sciences

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Reviewing the current state of knowledge about sequential extraction applied for soil vanadium (V) fractionation, we identified an urgent requirement of an sequential extraction (SE) specified for V. Namely, almost all previous SE extracted only 8.4%-48% of total V in soils (excluding residue). Thus, we proposed an eight-step SE for V fractionation in soils according to the knowledge gained from literature and our own dissolution experiments with model minerals. After extracting the mobilisable and adsorbed V with de-ionised water and 5mmol/L phosphate, 1mol/L pyrophosphate was applied to gather organic matter bound V which minimised the artefact dissolving Al and Fe (hydr)oxides occurred when using HNO-HO for extraction. Extraction with 0.4mol/L NHOH⋅HCl was highly selective toward manganese oxides. Fractionation of different crystalline Al and Fe (hydr)oxides associated V with 1mol/L HCl, 0.2mol/L oxalate buffer and 4mol/L HCl at 95°C especially improved the extractability of V incorporated with crystalline phase associated V. The suitability of our new SE scheme was confirmed by its higher selectivity against the target phases and higher extraction efficiencies (55%-77% of total V) with model minerals and 6 soils of different properties than previous SE.

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Sequential extraction of calcium in lake sediments for investigating the cycle of phosphorus in water environment

Cited by 8 publications

References 47 publications

Magnesium fractionation in different textural groups and commercial crop cultivations of Thai soils

Magnesium fractionation in different textural groups and commercial crop cultivations of Thai soils

In-situ sampling of available calcium using diffusive gradients in thin-films technique based on benzo-crown ether-functionalised silica as the binding agent

An optimised sequential extraction scheme for the evaluation of vanadium mobility in soils

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