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Quick Analysis of Organic Amendments via Portable X-ray Fluorescence Spectrometry

Author

Listed:
  • Rafael López-Núñez

    (Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Avda. Reina Mercedes 10, 41012 Sevilla, Spain)

  • Fátima Ajmal-Poley

    (Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Avda. Reina Mercedes 10, 41012 Sevilla, Spain)

  • José A. González-Pérez

    (Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Avda. Reina Mercedes 10, 41012 Sevilla, Spain)

  • Miguel Angel Bello-López

    (Department of Analytical Chemistry, Faculty of Chemistry, Universidad de Sevilla, c/Prof. García González, s/n, 41012 Sevilla, Spain)

  • Pilar Burgos-Doménech

    (Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Avda. Reina Mercedes 10, 41012 Sevilla, Spain)

Abstract

The determination of heavy metals in soils and organic amendments, such as compost, manure, biofertilizer, and sludge, generally involves the digestion of samples with aqua regia , and the determination of those in the solution using various techniques. Portable X-ray fluorescence (PXRF) has many advantages in relation to traditional analytical techniques. However, PXRF determines the total elemental content and, until now, its use for the analysis of organic amendments has been limited. The objective of this work is the calibration of a PXRF instrument to determine the aqua regia -soluble elemental contents directly in solid samples of organic amendments. Our proposal will avoid the digestion step and the use of other laboratory techniques. Using a training set of samples, calibration functions were obtained that allow the determination of the aqua regia -soluble contents from the PXRF readings of total contents. The calibration functions (obtained by multiple linear regression) allowed the quantitative determination of the aqua regia -soluble contents of Fe, K, P, S, Zn, Cu, Pb, Sr, Cr, and Mn, as well as the organic matter content and a semi-quantitative assessment of Al, Ca, V, Ba, Ni, and As contents. The readings of Si, Fe, Al, Ca, K, or S were used as correction factors, indicating that the calibrations functions found are truly based on the chemical composition of the sample matrix. This study will allow a fast, cheap, and reliable field analysis of organic amendments and of other biomass-based materials.

Suggested Citation

  • Rafael López-Núñez & Fátima Ajmal-Poley & José A. González-Pérez & Miguel Angel Bello-López & Pilar Burgos-Doménech, 2019. "Quick Analysis of Organic Amendments via Portable X-ray Fluorescence Spectrometry," IJERPH, MDPI, vol. 16(22), pages 1-18, November.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:22:p:4317-:d:284121
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    References listed on IDEAS

    as
    1. Andrew A. Meharg, 2016. "Perspective: City farming needs monitoring," Nature, Nature, vol. 531(7594), pages 60-60, March.
    2. Fang Li & Anxiang Lu & Jihua Wang, 2017. "Modeling of Chromium, Copper, Zinc, Arsenic and Lead Using Portable X-ray Fluorescence Spectrometer Based on Discrete Wavelet Transform," IJERPH, MDPI, vol. 14(10), pages 1-12, September.
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    Cited by:

    1. José M. De la Rosa & Arturo Santa-Olalla & Paloma Campos & Rafael López-Núñez & José A. González-Pérez & Gonzalo Almendros & Heike E. Knicker & Águeda Sánchez-Martín & Elena Fernández-Boy, 2022. "Impact of Biochar Amendment on Soil Properties and Organic Matter Composition in Trace Element-Contaminated Soil," IJERPH, MDPI, vol. 19(4), pages 1-16, February.

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