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.
journal_name
Chemospherejournal_title
Chemosphereauthors
Kalčíková G,Zupančič M,Jemec A,Gotvajn AŽdoi
10.1016/j.chemosphere.2015.12.090subject
Has Abstractpub_date
2016-03-01 00:00:00pages
311-7eissn
0045-6535issn
1879-1298pii
S0045-6535(15)30544-0journal_volume
147pub_type
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