AI Article Synopsis
- The study examines how humic acid affects chromium speciation in water, specifically focusing on the aquatic plant duckweed (Lemna minor).
- In the absence of humic acid, duckweed easily absorbs hexavalent chromium, leading to a significant decline in its growth and chlorophyll content.
- However, the presence of humic acid reduces chromium's bioavailability, resulting in less uptake by the plant and no noticeable negative effects on its growth.
- This highlights the importance of considering humic substances and chromium types in phytoextraction research.
Article Abstract
Studies assessing chromium phytoextration from natural waters rarely consider potential implications of chromium speciation in the presence of ubiquitous humic substances. Therefore, the present study investigated the influence of environmentally relevant concentration of humic acid (TOC = 10 mg L(-1)) on chromium speciation (Cr = 0.15 mg L(-1)) and consequently on phytoextraction by aquatic macrophyte duckweed Lemna minor. In absence of humic acid, only hexavalent chromium was present in water samples and easily taken up by L. minor. Chromium uptake resulted in a significant reduction of growth rate by 22% and decrease of chlorophyll a and chlorophyll b contents by 48% and 43%, respectively. On the other hand, presence of humic acid significantly reduced chromium bioavailability (57% Cr uptake decrease) and consequently it did not cause any measurable effect to duckweed. Such effect was related to abiotic reduction of hexavalent chromium species to trivalent. Hence, findings of our study suggest that presence of humic acid and chromium speciation cannot be neglected during phytoextraction studies.
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| http://dx.doi.org/10.1016/j.chemosphere.2015.12.090 | DOI Listing |
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