Binding of metal ions by particulate biomass derived from Chlorella vulgaris and Scenedesmus quadricauda

Harris, Patricia O.; Ramelow, Gerald J.

doi:10.1021/es00072a011

Cited by 236 publications

(92 citation statements)

References 20 publications

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“…In the present study, zinc uptake by both algae followed an initial rapid phase of uptaking during the first day of culturing, reached a maximum, and thereafter, followed by a decrease stabilization or little increase of the amount of total removed zinc. A similar pattern in removal of metals by Scenedesmus subspicatus, Scenedesmus quadricauda, and Chlorella vulgaris was also observed (Harris and Ramelow 1990;Knauer et al 1997). This time course can be explained by the binding of metal ions by functional groups on the cell surface and then the competition among the metal ions because of the decrease in the number of free binding sites on the biomass.…”

Section: Discussionsupporting

confidence: 65%

Biosorption of zinc and copper from aqueous solutions by two freshwater green microalgae Chlorella pyrenoidosa and Scenedesmus obliquus

Zhou

Peng

Zhang

et al. 2012

Environ Sci Pollut Res

144

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Purpose The objective of this study was to determine the removal of zinc and copper by two freshwater green microalgae Chlorella pyrenoidosa and Scenedesmus obliquus and to investigate changes of algal ultrastructure and photosynthetic pigment. Methods Algal cells were exposed for 8 days to different initial zinc or copper concentrations. Heavy metal concentrations were detected by an atomic absorption spectrophotometer. Algal growth, ultrastructure, and photosynthetic pigment were analyzed by a microplate reader, transmission electron microscope, and spectrophotometer, respectively. Results Low zinc and copper concentrations induced increase in algal growth, whereas application of high zinc and copper concentrations suppressed the growth of both algae. High metal concentrations also decreased the photosynthetic pigments and destroyed algal cell ultrastructure. The zinc removal efficiency by both algae increased rapidly during the first day and thereafter remained nearly constant throughout the experiment. The copper removal efficiency by both algae increased slowly during the whole experimental periods. In all cultures, the quantity of both metals removed intracellularly was much lower than the adsorbed quantity on the cell surface. Conclusions Both strains of the microalgae had proven effective in removing zinc and copper from aqueous solutions, with the highest removal efficiency being near 100%. In addition, C. pyrenoidosa appeared to be more efficient than S. obliquus for removing copper ions. On the contrary, S. obliquus appeared to be more efficient than C. pyrenoidosa for removing zinc ions.

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Section: Discussionsupporting

confidence: 65%

Biosorption of zinc and copper from aqueous solutions by two freshwater green microalgae Chlorella pyrenoidosa and Scenedesmus obliquus

Zhou

Peng

Zhang

et al. 2012

Environ Sci Pollut Res

144

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“…Harris and Ramelow (1990) found that Cd, Cu, and Zn rapidly desorbed from algal biomass at pH 3, similar to that found in protozoan digestive vacuoles (Fok et al 1982);and Frey and Small (1979) observed the release of bioavailable Fe from phytoplankton cell homogenate following in vitro replication of the protozoan digestion pH cycle. Barbeau et al (1996) detected a similar result following the ingestion of bacteria by protozoa.…”

Section: Subcellular Distribution Of Metals In Prey-supporting

confidence: 64%

Trophic transfer of trace metals from protozoa to mesozooplankton

Twining

Fisher

2004

Limnology & Oceanography

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Radiotracer techniques were used to quantify the assimilation and subsequent efflux of silver, cadmium, iron, mercury, thallium, and zinc by mesozooplankton fed ciliates, heterotrophic dinoflagellates, or heterotrophic flagellates, and the results were compared with published values measured for phytoplankton prey. The subcellular distribution of the metals within the prey cells was also determined and related to their bioavailability. Marine copepods assimilated 59-82% of Ag, 83-92% of Cd, 32-66% of Fe, 14-49% of Hg, and 71-78% of Zn ingested with protozoan prey. Higher Ag, Cd, Fe, and Hg assimilation efficiencies were observed for at least one of the species of protozoa than reported in the literature for phytoplankton. Significant differences in assimilation were not observed for Zn or for Tl fed to freshwater Ceriodaphnia in either protozoa or phytoplankton. The higher assimilation efficiencies of protozoan metals, when observed, were matched by higher fractions of metals in the cytoplasm of protozoa. A biokinetic model used to calculate steady-state metal concentrations in copepods indicates that copepods may contain 119% more Ag and 44% more Zn when feeding on ciliates instead of diatoms, possibly resulting in sublethal toxic effects at Ag and Zn concentrations reported for the Hudson River estuary. Further, higher assimilation and efflux rates of protozoan Fe may enhance remineralization of this limiting nutrient by mesozooplankton in high nutrient, low chlorophyll regions.Aquatic animals can accumulate metals both directly from their aqueous environment and from the prey they ingest, but metals accumulated through these two routes can have different physiological effects and geochemical fates. Food is often the dominant uptake pathway for metals in crustacean zooplankton (Munger and Hare 1997;Wang and Fisher 1998), and zooplankton can be more sensitive to metals accumulated through this pathway (Hook and Fisher 2001a,b). In addition to having greater physiological effects, metals that are ingested and assimilated by zooplankton can build up in food chains or be biologically recycled; these metals generally display longer residence times in surface waters than unassimilated metals, which get packaged into fecal pellets and sink out of surface waters (Fowler and Knauer 1986;Fisher et al. 1991). Metals bound to the exoskeleton may also be exported with molts (Fowler 1977).Most studies that have examined the assimilation of metals by zooplankton grazers have focused on phytoplankton prey (e.g., Sick and Baptist 1979;Fisher et al. 1991;Wang et al. 1996), but heterotrophic protists can also serve as an important food source for mesozooplankton. As the dominant grazers of heterotrophic and autotrophic picoplankton in many aquatic systems (Sherr and Sherr 1994), protozoa are an important trophic link between the microbial loop and the metazoan food web (Stoecker and Capuzzo 1990). Mi-

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“…Harris and Ramelow (1990) showed that silver, copper or zinc affected the binding of cadmium to biomass. Since both copper and zinc were present it could be that these metal ions out-competed the cadmium ions for adsorption sites, resulting in low removal of the latter.…”

Section: -----------------------------------------------------mentioning

confidence: 99%

“…The rapid increase in pH during the initial 24 h at 25 rev min −1 (Table 1) may have contributed to the high rates of copper accumulation since the binding efficiency of copper is known to increase rapidly with increases in pH in the range 3-5, with maximum adsorption at pH 5 (Harris and Ramelow 1990). At rotation speeds of 15 and 25 rev min −1 pH values above 5 were recorded after 24 h, whereas at 3 rev min −1 the pH remained below 5 (Table 1).…”

Section: -----------------------------------------------------Rotatiomentioning

confidence: 99%

Effect of disk rotational speed on heavy metal accumulation by rotating biological contactor (RBC) biofilms

Costley

Wallis

1999

Lett Appl Microbiol

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S. 1999. The efficiency of a rotating biological contactor (RBC) in the treatment of waters contaminated with cadmium, copper and zinc, in particular the effect of rotational speed, namely 3, 15 and 25 rev min −1 , on heavy metal reclamation was evaluated. Atomic absorption spectrophotometric analysis indicated × 92% and ³ 20% removal of copper (Cu 2+ ) and zinc (Zn 2+ ), respectively. Cadmium (Cd 2+ ) levels, however, remained constant. Similar results were obtained at all three rotation speeds tested.

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Binding of metal ions by particulate biomass derived from Chlorella vulgaris and Scenedesmus quadricauda

Cited by 236 publications

References 20 publications

Biosorption of zinc and copper from aqueous solutions by two freshwater green microalgae Chlorella pyrenoidosa and Scenedesmus obliquus

Biosorption of zinc and copper from aqueous solutions by two freshwater green microalgae Chlorella pyrenoidosa and Scenedesmus obliquus

Trophic transfer of trace metals from protozoa to mesozooplankton

Effect of disk rotational speed on heavy metal accumulation by rotating biological contactor (RBC) biofilms

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