Effect of grain size and moisture content on major and minor elements concentrations using portable X-ray fluorescence

Nuchdang, Sasikarn; Niyomsat, T; Pitiphatharabun, S; Sukhummek, Boonnak; Leelanupat, O; Rattanaphra, Dussadee

doi:10.1088/1742-6596/1144/1/012060

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…The XRF intensities of six metals decreased about 15%–20% by adding the water in 30 mass%. The similar results were reported in many previous studies 11–17 . Ge et al 14 explained that the reason why the XRF intensities decreased due to the soil moisture was replaced by water particles from the air in the soil pores and fractures, which enhanced the absorption of fluorescent X‐rays.…”

Section: Resultssupporting

confidence: 88%

“…On the other hand, a successful on‐site XRF analysis of soil samples requires appropriate correction of various interfering factors caused by differences in sample matrix, 7,8 mineral morphology, 9 particle size, 10–13 and moisture content 11–17 . The soil moisture effect that is often regarded as a matrix effect was reported in some literatures that XRF intensities of analytes in soil, especially for low Z element, generally decrease by effect of soil moisture, thereby the quantitative results of analyte in wet soil are estimated lower than those in dry soil.…”

Section: Introductionmentioning

confidence: 99%

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Effect of soil moisture and its correction method for quantitative analysis of hazardous metals in polluted soil for the on‐site XRF analysis

et al. 2021

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We investigated the effects of soil moisture and its correction method for on‐site XRF analysis of hazardous metals in polluted soil. A wet soil sample was prepared by exposing the water mist generated from the ultrasonic humidifier to dry soil for 0–95 min to reach the soil water content to 0–30 mass%. Calibration curves of six hazardous metals (Cr, As, Se, Cd, Hg, and Pb) measured from the soil certified reference materials JSAC 0461 to 0466 were compared with the water content changed from 0 to 30 mass%. The inclinations of calibration curves of six metals decreased with the increase of the water content. In addition, the XRF intensities of six metals decreased about 15%–20% by adding the water in 30 mass%. It was revealed that the soil moisture effect is caused by two factors as a decrease of the amount of analyte in the XRF generating area, and a change in the sample matrix due to increase of water contents. Thus, a new correction method using the combination between Compton scattered X‐rays and the water contents was applied to overcome the soil moisture effect. Applying the proposed correction method, calibration curves of six metals with different water content gave identical inclinations of calibration curves. The analytical results of chromium in the geochemical reference sample were in good agreement with the standard value even with increased water content.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Effect of soil moisture and its correction method for quantitative analysis of hazardous metals in polluted soil for the on‐site XRF analysis

et al. 2021

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“…These findings are consistent with previous studies that reported the impacts of sample moisture (Nuchdang et al 2018, Padilla et al 2019), and sample thickness (Liu et al 2018, Padilla et al 2019) on pXRF data collected from soil samples. Extended scan times were not found to result in significant data gains, which is supported by findings by Williams et al (2020), however is contrary to findings by Zhang et al (2021), which found extended (5 minute) scan times reduced variability in results when scanning bone through soft tissue.…”

Section: Discussionsupporting

confidence: 93%

Advancing the Application of pXRF for Biological Samples

Brandis,

Francis,

Zawada

et al. 2024

Preprint

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Point 1: Portable x-ray fluorescent (pXRF) technology provides significant opportunities for rapid, non-destructive data collection in a range of fields of study. However, there are sources of variation and sample assumptions that may influence the data obtained, particularly in biological samples.Point 2: We used representative species for four taxa (fish, mammals, birds, reptiles) to test the precision of replicate scans, and the impact of sample thickness, sample state, scan location and scan time on data obtained from a pXRF.Point 3: We detected significant differences in concentration data due to sample state, scanning time and scanning location for all taxa. Infinite thickness assumptions were met for fish, reptile and mammal representatives at all body locations when samples were thawed, but not dried. Infinite thickness was not met for feathers. Scan time results found in most cases the 40, 60 and 80 second beam times were equivalent. Concentration data across replicate scans were highly correlated.Point 4: The opportunities for the use of pXRF in biological studies are wide-ranging. These findings highlight the considerations required when scanning biological samples to ensure the required data are suitably collected, while maintaining minimal radiation exposure to live animals.

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“…However, measurements using pXRF may be affected by various physicochemical parameters of the matrix being measured, such as moisture, surface irregularity, mineralogy, and spectral interferences [11]. For soil, for instance, moisture and grain size are the most important parameters to consider due to their effects on pXRF measurements [12]. This underscores the need to establish ideal working conditions before applying this technique to new matrices.…”

Section: Introductionmentioning

confidence: 99%

Measurement of elements by portable x-ray fluorescence spectrometry for the study of adsorption processes: the case of Pb²⁺ adsorption on soybean straw biochar

Wannaz,

Medina,

Pardo

et al. 2024

Methods Appl. Fluoresc.

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This study evaluated the reliability of portable X-ray fluorescence (pXRF) in Pb2+ adsorption kinetics and isotherm experiments using soybean straw biochar. The research aimed to compare pXRF results with those obtained through traditional atomic absorption spectrometry (AAS). Soybean straw biochar, produced at 400 ºC, was employed as the adsorbent for Pb2+. The efficiency of adsorption was assessed using Langmuir and Freundlich models. The kinetics of Pb2+ adsorption was analysed through pseudo-first-order and pseudo-second-order models. The pseudo-second-order model described the kinetics of Pb2+ adsorption on biochar better than the pseudo-first order model. Importantly, the pXRF technique demonstrated comparable results to those of AAS, making it a reliable and resource-efficient method for studying Pb2+ kinetics. The results of the isotherm analyses fit the Langmuir model, indicating a desirable and irreversible adsorption of Pb2+ on biochar. PXRF measurements on biochar allowed simultaneous observations of Pb2+ adsorption and K+ and Ca2+ desorption, highlighting ionic exchange as the primary adsorption mechanism. In conclusion, our results showcased the applicability of pXRF for Pb+2 adsorption studies in biochars, offering a valuable alternative to traditional methods. The findings contribute to the understanding of biochar as an effective adsorbent for heavy metals, emphasizing the potential of pXRF for cost-effective and efficient environmental research. In this study, we present a novel and detailed procedure that will allow other researchers to continue their studies on Pb2+ adsorption on biochar or similar matrices, significantly reducing the resources and time used and enabling the simultaneous study of the behavior of other ions participating in the process.

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Effect of grain size and moisture content on major and minor elements concentrations using portable X-ray fluorescence

Cited by 7 publications

References 13 publications

Effect of soil moisture and its correction method for quantitative analysis of hazardous metals in polluted soil for the on‐site XRF analysis

Effect of soil moisture and its correction method for quantitative analysis of hazardous metals in polluted soil for the on‐site XRF analysis

Advancing the Application of pXRF for Biological Samples

Measurement of elements by portable x-ray fluorescence spectrometry for the study of adsorption processes: the case of Pb²⁺ adsorption on soybean straw biochar

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Effect of grain size and moisture content on major and minor elements concentrations using portable X-ray fluorescence

Cited by 7 publications

References 13 publications

Effect of soil moisture and its correction method for quantitative analysis of hazardous metals in polluted soil for the on‐site XRF analysis

Effect of soil moisture and its correction method for quantitative analysis of hazardous metals in polluted soil for the on‐site XRF analysis

Advancing the Application of pXRF for Biological Samples

Measurement of elements by portable x-ray fluorescence spectrometry for the study of adsorption processes: the case of Pb2+ adsorption on soybean straw biochar

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Product

Resources

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Measurement of elements by portable x-ray fluorescence spectrometry for the study of adsorption processes: the case of Pb²⁺ adsorption on soybean straw biochar