Deriving Soil Quality Criteria of Chromium Based on Species Sensitivity Distribution Methodology

Abstract

Chromium (Cr) is one of the most severe heavy metal contaminants in soil, and it seriously threatens ecosystems and human health through the food chain. It is fundamental to collect toxicity data of Cr before developing soil quality criteria/standards in order to efficiently prevent health risks. In this work, the short-term toxic effects of Cr(VI) and Cr(III) on the root growth of eleven terrestrial plants were investigated. The corresponding fifth percentile hazardous concentrations (HC5) by the best fitting species sensitivity distribution (SSD) curves based on the tenth percentile effect concentrations (EC10) were determined to be 0.60 and 4.51 mg/kg for Cr (VI) and Cr (III), respectively. Compared to the screening level values worldwide, the HC5 values in this study were higher for Cr(VI) and lower for Cr(III) to some extent. The results provide useful toxicity data for deriving national or local soil quality criteria for trivalent and hexavalent Cr.

Heavy Metal Stress and Mitogen Activated Kinase Transcription Factors in Plants: Exploring Heavy Metal-ROS Influences on Plant Signaling Pathways

“…Among the various (HMs), chromium hexavalent (Cr (VI) or Cr +6 ), stands out due to its structural similarity to phosphate (PO 4 3 -) and sulphate (SO4²-) ions. This similarity is notable as Cr(VI) happens to be one of the more stable forms of chromium found in soils (Liu et al, 2021). Subsequently as a result of these similarities, Cr(VI) is taken up by plant roots potentially through the use of phosphate and sulphate transporters (Cervantes et al, 2001).…”

Heavy metal stress and mitogen activated kinase transcription factors in plants: Exploring heavy metal‐ROS influences on plant signalling pathways

“…The change in redox state occurs due to the production and accumulation of ROS, which accompanies HM stress (Jalmi et al, 2018). These signals undergo processing and amplification through phosphorylation and dephosphorylation as they are transmitted to plant cells (Hao et al, 2021;Mondal, Pramanik, et al, 2022).…”

“…Among the various HMs, Cr (VI) has gained attention in HM absorption in plants due to its structural similarity to phosphate (PO 4 3 -) and sulfate (SO₄²-) ions (Genchi et al, 2021). This similarity is notable, as Cr (VI) happens to be one of the more stable forms of Cr found in soils (Liu et al, 2021). Subsequently, as a result of these similarities, Cr (VI) is taken up by plant roots, potentially through the use of phosphate and sulfate transporters (Cervantes et al, 2001).…”