Toxicity of uranium and copper individually, and in combination, to a tropical freshwater macrophyte (Lemna aequinoctialis)

Charles, Amanda L.; Markich, Scott J.; Ralph, Peter J.

doi:10.1016/j.chemosphere.2005.04.089

Cited by 49 publications

(24 citation statements)

References 27 publications

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“…Concerning about in situ remediation on the large area and low concentration of uranium contaminated water, the native aquatic plant should been selected depend on the high uranium accumulation and tolerance ability and the advantages of manageable. duckweed is a promising species for rhizofiltration with high tolerance and accumulation ability of Zn [25] and As [26] and U [27] and agricultural wastewater [28,29], meanwhile, it also has the advantages of fast growth and weed-like habit and worldwide distribution [30]. As generally observed, the transfer of U from root to shoot is limited [6,16,18].…”

Section: Introductionmentioning

confidence: 99%

Subcellular distribution of uranium in the roots of Spirodela punctata and surface interactions

Nie

Dong²,

Liu

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Subcellular distribution of uranium in the roots of Spirodela punctata and surface interactions

Nie

Dong²,

Liu

et al. 2015

Applied Surface Science

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“…In the experiment with a single toxicant, concentrations of As (Na 3 AsO 4 ·12H 2 O, analytical reagent) or Cd (CdCl 2 ·2.5H 2 O, analytical reagent) were targeted at the following levels: 0, 0.01, 0.03, 0.1, 0.33, 1.00, 3.33, 10, 33.3, 100 M. In the mixedtoxicant experiment, the treatments were set up according to the single toxicant data [18] and equitoxic mixture with a range of six concentrations (0, 0.4, 0.8, 1.2, 1.6, 2 TU). The equitoxic mixture approach is more reasonable than equi-concentration mixture one because it is supposed that 0.5n × EC 50 As and 0.5n × EC 50 Cd had same toxicity and their mutual toxicity should be 1n × TU mix .…”

Section: Root Elongation Test In Solutionmentioning

confidence: 99%

“…According to the toxic data of single As and Cd, the mixedtoxicant experiments were prepared as Eqs. (2) and (3) and with equitoxic ratio hypothesis [18,25]. The combined effect of mixture (EC 50mix ) was calculated by regression, and expressed with TU mix , then compared with expected effects from concentration additive (1TU mix ) [26,27].…”

Section: Principles For Preparing Mixture and Determining Combined Efmentioning

confidence: 99%

Wheat phytotoxicity from arsenic and cadmium separately and together in solution culture and in a calcareous soil

Cao¹,

Hu²,

Khan³

et al. 2007

Journal of Hazardous Materials

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The toxicity of two toxic elements, arsenic (As) and cadmium (Cd) (individually or in combination) on root elongation of wheat seedlings (Triticum aestivum, L.) were investigated both in hydroponics and in soils freshly spiked with the toxic elements. Median effective concentration (EC 50 ) and non-observed effect concentration (NOEC) were used to investigate the toxic thresholds and potencies of the two elements. The EC 50 for As was 0.97 M in hydroponics and 196 mg kg −1 in soil, and 4.32 M and 449 mg kg −1 for Cd, respectively. Toxic unit (TU) and additive index (AI) concepts were introduced to determine the combined outcomes, and different behaviors were obtained: synergism in solution culture (EC 50mix = 0.36TU mix and AI: 1.76) and antagonism in soil experiments (EC 50mix = 1.49TU mix and AI: −0.33). Furthermore, the data of soil bioavailable As and Cd cannot explain the discrepancy between the results derived from soil and hydroponics experiments.

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“…Although copper can act at many different levels in the cell, one of the most important mechanisms of copper action in green plants is believed to be the inhibition of electron transfer in the chloroplasts, the destruction of the chloroplast membrane, and inhibition of the photosynthetic pigments formation (Yan & Pan, 2002;Charles et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessment of catalase activity, lipid peroxidation, chlorophyll a, and growth rate in the freshwater green algae Pseudokirchneriella subcapitata exposed to copper and zinc

Soto¹,

Gaete²,

Hidalgo³

2011

lajar

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ABSTRACT. In this work, the effect of copper and zinc on green alga Pseudokirchneriella subcapitata was evaluated through catalase activity, lipid peroxidation by TBARS essay, growth rate, and the chlorophyll-a concentration. Catalase activity increased significantly (P < 0.05) in comparison to the control at 0.1 mg L -1 copper and 0.075 mg L -1 zinc, whereas the damage to the cell membrane expressed as nmols/10 6 cell of malondialdehyde increased significantly (P < 0.05) at 0.025 mg L -1 copper and 0.1 mg L -1 zinc. On the other hand, a significant (P < 0.05) decrease in chlorophyll-a concentration was found at 0.075 mg L -1 of both metals. The results showed that catalase activity, lipid peroxidation, and chlorophyll-a concentration were more sensitive to metals than the growth rate. Keywords: toxicity, bioassays, water quality, oxidative damage, Pseudokirchneriella subcapitata, Chile.Evaluación de la actividad de la catalasa, peroxidación lipídica, clorofila-a y tasa de crecimiento en la alga verde de agua dulce Pseudokirchneriella subcapitata expuesta a cobre y zinc RESUMEN. En este trabajo, se evaluó el efecto del cobre y zinc en la alga verde Pseudokirchneriella subcapitata a través de la actividad catalasa, peroxidación lipídica por el ensayo TBARS, tasa de crecimiento y concentración de clorofila-a. La actividad catalasa aumentó significativamente (P < 0,05) en comparación al control en 0,1 mg L -1 y 0,075 mg L -1 de cobre y zinc respectivamente, mientras que el daño en la membrana celular expresado en nanomols/10 6 células de malondialdehído aumentó significativamente en 0,025 mg L -1 y 0,1 mg L -1 de cobre y zinc respectivamente. Por otra parte, hubo una disminución significativa (P < 0,05) en la concentración de clorofila-a en ambos metales a 0,075 mgL -1 . Los resultados mostrados en actividad catalasa, peroxidación lipídica y concentración de clorofila-a son parámetros más sensibles que la tasa de crecimiento a los metales. Palabras clave: toxicidad, bioensayos, calidad de agua, daño oxidativo Pseudokirchneriella subcapitata, Chile.

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Toxicity of uranium and copper individually, and in combination, to a tropical freshwater macrophyte (Lemna aequinoctialis)

Cited by 49 publications

References 27 publications

Subcellular distribution of uranium in the roots of Spirodela punctata and surface interactions

Subcellular distribution of uranium in the roots of Spirodela punctata and surface interactions

Wheat phytotoxicity from arsenic and cadmium separately and together in solution culture and in a calcareous soil

Assessment of catalase activity, lipid peroxidation, chlorophyll a, and growth rate in the freshwater green algae Pseudokirchneriella subcapitata exposed to copper and zinc

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