Uranium and Thorium Accumulation in Cultivated Plants

Shtangeeva, Irina

doi:10.1002/9780470370124.ch14

Cited by 4 publications

(3 citation statements)

References 86 publications

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“…Natural radioelements such as thorium (Th) and uranium (U) are present in soil due to their pedogenic formation. The U average concentration in the earth crust has been reported to be in the range of 2–3 ppm, whereas Th is in the range of 8–12 ppm (IAEA, 2003; Shtangeeva, 2008). In agricultural soils, the natural occurrence as well as the addition of radioelements due to phosphatic fertilizers has been the focus of some research (Becegato et al., 2008; Bramki et al., 2018; de Souza Braz et al., 2021; Omoniyi et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

Thorium and uranium rapid quantification in soil with portable X‐ray fluorescence

Melquiades,

Bastos,

Rampim

et al. 2024

Soil Science Soc of Amer J

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This study aims to evaluate the thorium (Th) and uranium (U) quantification in soil employing a commercial routine in a portable X‐ray fluorescence (pXRF) spectrometer. Certified reference materials (CRMs), as well as a soil sample set, were measured by pXRF and gamma‐ray spectrometry. The pXRF results showed that the thorium average detection and quantification limits (in mg kg−1) were 3.3 ± 0.5 and 11.0 ± 1.7, respectively. The uranium values were 3.0 ± 0.4 and 9.9 ± 1.3. Quantitative pXRF results for Th were in accordance with the reference reported for most CRMs analyzed, and the same accordance was obtained in the comparison with gamma‐ray spectrometry results for the soil sample set. However, U results were overestimated by pXRF when compared both with the CRM‐reported values and the gamma‐ray spectrometry results. In conclusion, the tested pXRF commercial routine may be a viable technique to identify variations in natural Th levels in soil but needs to be used with caution to identify and quantify U.

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Section: Introductionmentioning

confidence: 99%

Thorium and uranium rapid quantification in soil with portable X‐ray fluorescence

Melquiades,

Bastos,

Rampim

et al. 2024

Soil Science Soc of Amer J

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“…In the last 20 years, aiming to increase the productivity of crops, Brazilian agriculture has intensified the use of new technologies, including large-scale application of P-fertilizers [1], which contain radioelements [2][3][4]. Uranium (U) occurs naturally in the earth's crust, varying from 0.4 to 6.0 mg kg −1 in soils [5], with an average concentration of 2.5 mg kg −1 , while thorium (Th) is almost three times more abundant than U [6], with concentrations ranging from 2 to 12 mg kg −1 and an average value of 6 mg kg −1 [7]. Despite their natural occurrence in soils and plants, increased concentrations of U and Th in these environmental compartments may suggest areas affected by anthropogenic activities, such as agriculture, industrialization and mining [8].…”

Section: Introductionmentioning

confidence: 99%

“…The impact of P-fertilizers on U and Th concentrations in agricultural soils has been the subject of environmental and human health risk assessments [9][10][11][12][13][14]. The concentrations of U and Th are usually higher in phosphate-rich soils [6]. Becegato et al [15] observed increases in the concentrations of Th (0.02 to 0.69 mg kg −1 ) in agricultural soils and related Minerals 2021, 11, 994 2 of 14 them to the use of phosphate fertilizers.…”

Section: Introductionmentioning

confidence: 99%

Long Term Application of Fertilizers in Eastern Amazon and Effect on Uranium and Thorium Levels in Soils

et al. 2021

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In recent years, the use of fertilizers has increased in the Amazon. Phosphate fertilizers, which are commonly used, can present high concentrations of radioelements. In the present study, the activity concentrations of uranium (U) and thorium (Th) in Oxisols and Ultisols cultivated with citrus (Citrus sinensis (L.) Osbeck), oil palm (Elaeis guineensis Jacq.) and black pepper (Piper nigrum L.), with 26, 10 and 5 years of implantation, respectively, were evaluated. The potential risk of contamination was estimated by the enrichment (EF) and bioaccumulation (BAF) factors. Pearson’s correlation coefficients indicated a significant relationship between the concentrations of U and Th in soil and plant and the soil properties pH, Ca2+, Mg2+, K+ and P. The enrichment (EF < 2) and bioaccumulation (0.01 < BAF < 0.05) factors were low. In plant tissues, the concentrations of 238U followed the order: citrus > black pepper > oil palm, and the concentrations of 232Th followed the sequence: black pepper >> citrus > oil palm. The activity concentrations of 238U and 232Th in the soil cultivated with black pepper, as well as in the soil of the reference area close to the citrus plantation, were higher than the world average values of 35 and 30 Bq kg−1, respectively, established by the United Nations Scientific Committee on Effects of Atomic Radiation. Perennial crops that are fertilized annually must be monitored by environmental agencies due the accumulation of elements that can promote potential risks to human health.

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Assessment of natural radioactivity levels in rice samples and their implications for radiological protection

Younis,

Ullah,

Khan

et al. 2024

Isotopes in Environmental and Health Studies

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Uranium and Thorium Accumulation in Cultivated Plants

Cited by 4 publications

References 86 publications

Thorium and uranium rapid quantification in soil with portable X‐ray fluorescence

Thorium and uranium rapid quantification in soil with portable X‐ray fluorescence

Long Term Application of Fertilizers in Eastern Amazon and Effect on Uranium and Thorium Levels in Soils

Assessment of natural radioactivity levels in rice samples and their implications for radiological protection

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