Experimental study of mercury transfer between artificially contaminated sediment (CH3HgCl) and macrophytes (Elodea densa)

Maury, René C.; Boudou, A.; Ribeyre, Francis; Engrand, P.

doi:10.1016/0166-445x(88)90024-0

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…Both species took up metal directly into the roots when the sediment compartment was contaminated with HgC12. More recently, Maury et al (1988) measured uptake, by Elodea densa, of CH32°3HgC1 from contaminated sediment. Roots were the main vector of Hg accumulation, and most of the Hg was subsequently transported to and stored in the shoots.…”

Section: Discussionmentioning

confidence: 99%

“…However, Rahn (1973) and Maury et al (1988) detected no "downward" transport of Hg in either Spartina alterniflora or Elodea densa. Therefore, apparently no firm conclusions can be drawn concerning the downward transport of mercury in rooted aquatic plants.…”

Section: Evidence For Transport Of Hg In E Septangularementioning

confidence: 99%

“…To trace the pathway of Hg uptake from contaminated sediment, a design was chosen that allowed treatment of plants in a single aquarium with both contaminated and natural sediment; our design was developed from the design used by Maury et al (1988). Groups of E. septangulare were planted in beakers containing natural sediment (referred to as "C") or contaminated sediment (referred to as "H").…”

Section: Experimental Designmentioning

confidence: 99%

“…For Hg, Maury et al (1988) considered that contamination of Elodea densa leaves by CH3HgC1 transported from the roots was the most important means for mercury storage in leaves.…”

Section: Evidence For Transport Of Hg In E Septangularementioning

confidence: 99%

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Mercury uptake from contaminated water and sediment by the rooted and submerged aquatic macrophyte Eriocaulon septangulare

Coquery

Welbourn

1994

Arch. Environ. Contam. Toxicol.

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Abstract. Laboratory experiments were designed to assess the relative importance of root vs shoot uptake of mercury by the submerged isoetid aquatic macrophyte Eriocaulon septangulare. Roots of mature plants that had been cultured for 31 days in sediments contaminated with non-toxic (approx. 1 I~g g 1) concentrations of inorganic mercury had significantly higher concentrations and significantly greater mercury content than plants cultured in the same way but in sediments without added mercury. Under the same experimental conditions, mercury content of leaves was related to the concentration of mercury in the water, being greater in the treatments which had higher total mercury in the water. The mercury in water in the experiments originated from the sediment. There was no evidence for transport of mercury from root to shoot within the plant, although there was possibly some transport in the opposite direction. The design of the experiment avoided making two compartments with a physical separation between the water (leaf)/sediment (root) interface, but with this design it was not possible to determine with certainty whether or not "downward" transport of mercury occurred within the plant. The results with E. septangulare and mercury support the idea that aquatic macrophytes can be useful monitors of metals in sediments.Rooted and submerged vascular plants can take up substances from their environment by one of two routes: either from the water column, through submerged shoots, or from interstitial water of the sediment, through the roots. The relative importance of these two routes for nutrient or for metal uptake, respectively, is not clear, although it is accepted that both pathways may operate in the same plant (Denny 1980 Campbell et al. 1985Campbell et al. , 1988.A number of investigators have suggested that aquatic macrophytes can serve as useful monitors of the bioavailability of sediment-bound toxic metals (Aulio 1980;Campbell et al. 1985Campbell et al. , 1988Lyngby and Brix 1987).Furthermore, the ability of rooted macrophytes to accumulate metals from the sediment compartment suggests that aquatic plants can play a role in metal cycling in lakes (Mclntosh et al. 1978;Larsen and Schierup 1981) by transferring metals to herbivores, by releasing metals during decomposition Schierup and Larsen 1981), or by secreting metals into the water column (Kraus et al. 1986). The cycling will be more effective if metal accumulated in the roots can be transported to the shoots.Many field studies have demonstrated metal accumulation in aquatic plants and the relative importance of root vs shoot accumulation seems quite variable. But because most field studies have not considered the root and shoot uptake separately, uptake routes and possible transport of metal within plants remain unclear.In order to address the relative importance of root vs shoot uptake in a rooted aquatic plant, we designed a laboratory experiment to assess the relative importance of two routes of Hg transfer between the sediment and Eriocaulon septan...

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Section: Discussionmentioning

confidence: 99%

Section: Evidence For Transport Of Hg In E Septangularementioning

confidence: 99%

Section: Experimental Designmentioning

confidence: 99%

“…For Hg, Maury et al (1988) considered that contamination of Elodea densa leaves by CH3HgC1 transported from the roots was the most important means for mercury storage in leaves.…”

Section: Evidence For Transport Of Hg In E Septangularementioning

confidence: 99%

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