A review on distribution coefficient (Kd) of some selected radionuclides in soil/sediment over the last three decades

Kumar, Ajay; Rout, Sabyasachi; Pulhani, Vandana

doi:10.1007/s10967-019-06930-x

Cited by 16 publications

(7 citation statements)

References 58 publications

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“…2,000 L kg -1 for acidic soils, 3,000-40,000 L kg -1 for neutral soils and 300-20,000 L kg -1 for calcareous soils (Figure S4). These are within the ranges reported in the literature (Krupka et al, 1999;Kumar et al, 2019;Sheppard et al, 2007). Values increased slightly within the first few months reflecting the gradual decrease in Usol described above (Figure 2).…”

Section: Partition Coefficients Kdsupporting

confidence: 90%

Kinetics of uranium(VI) lability and solubility in aerobic soils

et al. 2020

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Uranium may pose a hazard to ecosystems and human health due to its chemotoxic and radiotoxic properties.The long half-life of many U isotopes and their ability to migrate raise concerns over disposal of radioactive wastes. This work examines the long-term U bioavailability in aerobic soils following direct deposition or transport to the surface and addresses two questions: (i) to what extent do soil properties control the kinetics of U speciation changes in soils and (ii) over what experimental timescales must U reaction kinetics be measured to reliably predict long-term of impact in the terrestrial environment? Soil microcosms spiked with soluble uranyl were incubated for 1.7 years. Changes in U VI fractionation were periodically monitored by soil extractions and isotopic dilution techniques, shedding light on the binding strength of uranyl onto the solid phase. Uranyl sorption was rapid and strongly buffered by soil Fe oxides, but U VI remained reversibly held and geochemically reactive. The pool of uranyl species able to replenish the soil solution through several equilibrium reactions is substantially larger than might be anticipated from typical chemical extractions and remarkably similar across different soils despite contrasting soil properties. Modelled kinetic parameters indicate that labile U VI declines very slowly, suggesting that the processes and transformations transferring uranyl to an intractable sink progress at a slow rate regardless of soil characteristics. This is of relevance in the context of radioecological assessments, given that soil solution is the key reservoir for plant uptake.

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Section: Partition Coefficients Kdsupporting

confidence: 90%

Kinetics of uranium(VI) lability and solubility in aerobic soils

et al. 2020

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“…) K d values are measured using one of the five general methods: the laboratory batch method, the laboratory flow-through (or column) method, the in-situ batch method, the field modeling method, and the K oc method (EPA, 2004;Kumar et al, 2019). The following section briefly summarizes the advantages and disadvantages of each method.…”

Section: Experimental Methods Of Kd Estimationmentioning

confidence: 99%

“…The sorption equilibrium that governs Cu exchange between solid and liquid phases determines its phytotoxicity and the risk of contamination of water resources. The mobility and fate of Cu in the soil environment are directly related to its K d , which indicates the ability of soil to retain a solute as well as the extent of its movement into the liquid phase (Christiansen et al, 2015;Ding et al, 2018;Kumar et al, 2019) to 4317.9 L/kg for arable land (0 -20 cm) and land under permanent grass cover (0 -10 cm).…”

Section: Copper (Cu)mentioning

confidence: 99%

“…The heavy metal sorption capacity, also known as distribution coefficient (K d ), is determined by the ratio of heavy metal concentrations in the solid phase to that in equilibrium solution after a given reaction time. When measured under the same experimental conditions, K d is a valuable parameter for comparing the sorptive capacities of different soils (Ding et al, 2018;Kumar et al, 2019;Shaheen et al, 2013) and essential for simulating the transport of heavy metals into environments.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have implemented several laboratory approaches to determining K d values of heavy metals. The factors influencing K d values include sorption systems (either mono-metal system-MS or competitive system-CS), element properties (e.g., element type and characteristics), physical and chemical properties of soil (e.g., soil texture, mineralogical composition, and cation exchange capacity, and soil pH), and experimental conditions (e.g., reaction time and temperature) (Braz et al, 2013;Gu et al, 2014;Guo et al, 2013;Kumar et al, 2019;Loganathan et al, 2012;Wang et al, 2022;Zheng et al, 2016). The diversity of influencing factors eventually results in a wide range of K d values for heavy metals in soils, which can make it difficult to deduce some standard K d values or magnitudes to be used as reliable indicators for assessing the remediation process of toxic metals in soils.…”

Section: Introductionmentioning

confidence: 99%

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A Review of the Distribution Coefficient (<i>K<sub>d</sub></i>) of Some Selected Heavy Metals over the Last Decade (2012-2021)

Seidou¹,

Wang²,

Espoire³

et al. 2022

GEP

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This review synthesizes the methods for estimating the distribution coefficient (K d ) and provides a compilation of K d values for five heavy metals (As, Pb, Cd, Cu, and Zn) based on research published in the last decade (2012)(2013)(2014)(2015)(2016)(2017)(2018)(2019)(2020)(2021). We used the PRISMA method to ensure the transparency of the collected data. For mono-metal systems (MS), the K d values ranged from 10 −2 to 10 7 L/kg for Pb, from 10 −2 to 10 6 L/kg for Cd, As, and Zn, and from 10 −2 to 10 5 L/kg for Cu. In competitive systems (CS), the K d values ranged from 10 −2 to 10 5 L/kg for Cu, and 10 −2 to 10 4 L/kg for Pb, Cd, and Zn, while no K d value for As was reported under CS. It was found that the K d values of heavy metals are affected not only by soil chemical and physical properties but also by the nature and characteristics of the metal involved along with experimental conditions. The totals references number of K d data observation per element metal are represented as follows: Cd 35 (50%), Zn 35 (50%), Pb 33 (47.14%), Cu 33 (47.14%), and As 19 (27.14%). Overall, most research was done 1) on MS rather than CS, 2) on sorption rather than desorption, 3) on soil rather than sediments , and 4) most literature have reported the K d values, derived from batch method than on column method. Despite significant progress over the past decade towards a better understanding of the variation in K d values and the effect of factors influencing them to provide important parameters for predicting and controlling toxic metals in soils, additional research is still warranted to the complexity of underlying processes.

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2022

Marine Radioecology

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A review on distribution coefficient (Kd) of some selected radionuclides in soil/sediment over the last three decades

Cited by 16 publications

References 58 publications

Kinetics of uranium(VI) lability and solubility in aerobic soils

Kinetics of uranium(VI) lability and solubility in aerobic soils

A Review of the Distribution Coefficient (<i>K<sub>d</sub></i>) of Some Selected Heavy Metals over the Last Decade (2012-2021)

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A review on distribution coefficient (Kd) of some selected radionuclides in soil/sediment over the last three decades

Cited by 16 publications

References 58 publications

Kinetics of uranium(VI) lability and solubility in aerobic soils

Kinetics of uranium(VI) lability and solubility in aerobic soils

A Review of the Distribution Coefficient (&lt;i&gt;K&lt;sub&gt;d&lt;/sub&gt;&lt;/i&gt;) of Some Selected Heavy Metals over the Last Decade (2012-2021)

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A Review of the Distribution Coefficient (<i>K<sub>d</sub></i>) of Some Selected Heavy Metals over the Last Decade (2012-2021)