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Aims <p>Plants serve as bioindicators of environmental heavy metal pollution. Rapid, non-destructive techniques for plant elemental analysis are essential for understanding pollutant uptake and nutrient interactions. This study aimed to develop a novel approach integrating Laser-Induced Breakdown Spectroscopy (LIBS) with guttation fluid for non-destructive monitoring of elemental dynamics in Alocasia under Cr (III) stress.</p> Methods <p>Guttation fluid (easy to collect and with a large volume) was collected non-destructively from hydroponically cultivated Alocasia plants subjected to Cr (III) stress. LIBS analysis was performed on fluid samples using a liquid-to-solid enrichment strategy to enhance trace detection. Signal validation was conducted via comparison with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) measurements.</p> Results <p>Guttation fluid elemental composition strongly correlated with plant tissues. Under Cr(III) stress, Cr signal intensity increased with stress concentration, while Mg and Ca signals decreased by approximately 30–40%. The accumulation of Cr in guttation fluid continued to rise to a peak and then decreased (likely associated with root damage). LIBS results showed significant correlation with those obtained by ICP-MS (R<sup>2</sup> = 0.995 for Cr(Ⅰ)). The method achieved a detection limit of 20.3&#xa0;ppb for Cr with excellent linearity (R<sup>2</sup> = 0.963).</p> Conclusion <p>This LIBS-guttation fluid approach provides a reliable, non-destructive means to monitor plant responses to heavy metal stress, offering potential for environmental biomonitoring and crop safety assessment.</p>

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Non-destructive detection of ionic species in plants under Cr(III) stress using LIBS

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Qiyang Cai,
  • Fanghao Xu,
  • Shuaishuai Zhang,
  • Fengjing Cao,
  • Ke Wang,
  • Daming Dong,
  • Xiande Zhao

摘要

Aims

Plants serve as bioindicators of environmental heavy metal pollution. Rapid, non-destructive techniques for plant elemental analysis are essential for understanding pollutant uptake and nutrient interactions. This study aimed to develop a novel approach integrating Laser-Induced Breakdown Spectroscopy (LIBS) with guttation fluid for non-destructive monitoring of elemental dynamics in Alocasia under Cr (III) stress.

Methods

Guttation fluid (easy to collect and with a large volume) was collected non-destructively from hydroponically cultivated Alocasia plants subjected to Cr (III) stress. LIBS analysis was performed on fluid samples using a liquid-to-solid enrichment strategy to enhance trace detection. Signal validation was conducted via comparison with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) measurements.

Results

Guttation fluid elemental composition strongly correlated with plant tissues. Under Cr(III) stress, Cr signal intensity increased with stress concentration, while Mg and Ca signals decreased by approximately 30–40%. The accumulation of Cr in guttation fluid continued to rise to a peak and then decreased (likely associated with root damage). LIBS results showed significant correlation with those obtained by ICP-MS (R2 = 0.995 for Cr(Ⅰ)). The method achieved a detection limit of 20.3 ppb for Cr with excellent linearity (R2 = 0.963).

Conclusion

This LIBS-guttation fluid approach provides a reliable, non-destructive means to monitor plant responses to heavy metal stress, offering potential for environmental biomonitoring and crop safety assessment.