Rapid Detection of Available Cr(VI) in Soil Based on pXRF Combined with Ion-Exchange Resin

Taige Fu, Wei Liu, Xinglan Fu, Yuehua Huang, Huanhuan Lou, Jie Song and Guanglin Li ()
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Taige Fu: College of Engineering and Technology, Southwest University, 216 Tiansheng Road, Chongqing 400715, China
Wei Liu: College of Engineering and Technology, Southwest University, 216 Tiansheng Road, Chongqing 400715, China
Xinglan Fu: College of Engineering and Technology, Southwest University, 216 Tiansheng Road, Chongqing 400715, China
Yuehua Huang: College of Engineering and Technology, Southwest University, 216 Tiansheng Road, Chongqing 400715, China
Huanhuan Lou: College of Engineering and Technology, Southwest University, 216 Tiansheng Road, Chongqing 400715, China
Jie Song: College of Engineering and Technology, Southwest University, 216 Tiansheng Road, Chongqing 400715, China
Guanglin Li: College of Engineering and Technology, Southwest University, 216 Tiansheng Road, Chongqing 400715, China

Agriculture, 2025, vol. 15, issue 5, 1-17

Abstract: The detection of available Cr(VI) in soil is critical due to its high uptake by plants, which enables it to enter the food chain and pose significant health risks to humans. Traditional detection methods are often time-consuming and labor-intensive, limiting their suitability for rapid, on-site measurements. This study introduces a novel approach for the rapid detection of available Cr(VI) in soil, utilizing portable X-ray fluorescence spectrometry (pXRF) in combination with ion-exchange resin. The method was validated using soil samples from three distinct regions, representing three different soil types. Compared to conventional laboratory methods, the detection rates for Cr(VI) ranged from 80.73% to 124.14%, with relative standard deviations for repeated analyses ranging from 3.05% to 5.73%, both of which comply with national standards. Regression analysis confirms a strong linear relationship between spectral values and Cr(VI) concentration in standard solutions (R 2 = 0.9986). Through resin enrichment, the detection limit (LoD) for Cr(VI) in soil solution reaches 0.070 mg/kg, facilitating trace-level detection of available Cr(VI) in soil. In contrast to traditional methods, the pXRF-ion-exchange resin approach minimizes secondary environmental contamination, is cost-effective and time-efficient, and does not require complex soil pretreatment. Consequently, it is highly suitable for rapid, on-site soil analysis. This study presents an innovative method for the detection of available Cr(VI) in soils. This approach effectively reduced analysis time and simplified sample pretreatment, and thus holds substantial potential for practical application.

Keywords: soil; available Cr(VI); portable X-ray fluorescence spectrometry; rapid detection; resin (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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