Copper and chromium (III) uptake by duckweed

The duckweed Lemna minor was cultivated under laboratory conditions with the amount of incident light as limiting growth factor. The fronds were found to double every 3 days under the highest radiation intensity. The plants were exposed to Cu and Cr(III) solutions of 0.25 and 1.0 mg ℓ−1 during 10 da...

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Bibliographic Details
Published in:Water science and technology 1995, Vol.32 (11), p.105-110
Main Authors: Abdel Wahaab, R., Lubberding, H.J., Alaerts, G.J.
Format: Article
Language:English
Subjects:
Aquatic plants
Chromium
Copper
Dilution
Dry weight
Duckweed
Duckweeds
Floating plants
Freshwater
Freshwater plants
Fronds
Growth factors
heavy metal
Heavy metals
Incident light
Lemna minor
Lemnaceae
Removal
sewage treatment
Solutions
Uptake
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Summary:The duckweed Lemna minor was cultivated under laboratory conditions with the amount of incident light as limiting growth factor. The fronds were found to double every 3 days under the highest radiation intensity. The plants were exposed to Cu and Cr(III) solutions of 0.25 and 1.0 mg ℓ−1 during 10 days. The plants needed to adapt for app. 8 days before attaining maximal, steady state removal. Cr(III) was removed more efficiently from the solution (75–100% in terms of concentration or load reduction) than Cu (35–40%), the higher efficiencies pertaining to the more dilute solutions. Uptake rates were 80–333 and 250–667 mg d−1 m−2 for Cu and Cr(III), respectively. The plants accumulated 1–2 g metal kg−1 plant (dry weight) when exposed to the high concentration. Cu seemed toxic at 1.0 mg ℓ−1, resulting in plant mortality after 8 days.
ISSN:0273-1223
1996-9732
DOI:10.1016/0273-1223(96)00123-0