Document Detail

S.TR.E.A.M., system for trace element assessment with mosses. An equation to estimate mercury concentration in freshwaters.
MedLine Citation:
PMID:  19249814     Owner:  NLM     Status:  MEDLINE    
Hundred experiments of Hg bioaccumulation with the aquatic moss Rhynchostegium riparioides (Hedw.) C.E.O. Jensen transplanted under laboratory conditions were carried out with the aim of (1) measuring the metal uptake at increasing water concentrations (0.25-128 microg Hg(2+)L(-1)) and increasing exposure time (24-189 h), (2) studying the influence of pH (6.3-8.5) and water concentration of Na (3-114 mg L(-1)), Ca (62-125 mg L(-1)) and Mg (13-54 mg L(-1)) on the metal uptake, (3) achieving a database for mathematical and statistical elaborations, and, (4) producing an equation modelling the uptake. A linear uptake was observed for water concentrations <or=4 microg Hg(2+)L(-1), while a saturation curve was observed at higher concentrations. Uptake followed a 3-stage trend for increasing exposure times: a phase of rapid accumulation (4-5d), followed by an equilibrium plateau (2-3d) and then by a second accumulation phase. The factor influence study revealed that variations in pH or water concentration of alkaline metals, within the range of typical values in freshwaters of NE Italy, did not produce significant differences (p>0.05) in the Hg uptake ratio (0.496x10(5)<or= Bio Accumulation Factor <or= 1.73x10(5)). From a database of 28 Hg concentrations in mosses exposed to 0.25-4 microg Hg(2+)L(-1) for 24-114 h, a mathematical equation was produced, to assess Hg micro-contamination in water. The difference between predicted and real concentration was generally included in the range+/-50%.
Mattia Cesa; Alesssandro Bizzotto; Claudio Ferraro; Flaminio Fumagalli; Pier Luigi Nimis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-02-27
Journal Detail:
Title:  Chemosphere     Volume:  75     ISSN:  1879-1298     ISO Abbreviation:  Chemosphere     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-04-20     Completed Date:  2009-06-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  858-65     Citation Subset:  IM    
Department of Life Sciences, University of Trieste, Trieste, Italy.
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MeSH Terms
Bryopsida / metabolism*
Fresh Water / analysis*
Hydrogen-Ion Concentration
Mercury / analysis*
Models, Biological
Time Factors
Trace Elements / analysis*
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Trace Elements; 0/Water Pollutants, Chemical; 7439-97-6/Mercury

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