Document Detail


Arsenic distribution and speciation in Daphnia pulex.
MedLine Citation:
PMID:  22750169     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Rat Lake, Yellowknife, Northwest Territories, is situated on arsenic-rich tailings from a historical gold mine. The abundant zooplankton species Daphnia pulex in this lake was used to study the impact of arsenic at the base of the freshwater food web; the speciation and distribution of arsenic in D. pulex and its food sources; and the origin of formation of organoarsenicals in freshwater systems. The arsenic concentration in lake water was measured as 0.25mgL(-1), while the zooplankton organisms contained up to 35mgkg(-1) d.w. arsenic. Plankton samples were analyzed for arsenic speciation, by using X-ray Absorption Near Edge Structure (XANES) on the whole, dried samples and High Performance Liquid Chromatography coupled to Inductively Coupled Plasma Mass Spectrometry (HPLC-ICP-MS) on water extracts. XANES data suggest that D. pulex mainly contain inorganic arsenicals with 56% of arsenic with +5 oxidation state and 10% of arsenic with +3 oxidation state, but also 34% of organoarsenic compounds that were identified with HPLC-ICP-MS as monomethylarsonate (MMA), dimethylarsinate (DMA), and arsenosugars. The most abundant of the organoarsenicals was the glycerol sugar (Sugar 1). X-ray Fluorescence (XRF) mapping of D. pulex for arsenic distribution showed that arsenic was mainly distributed in the gut of the animal, where its concentration was ten times higher than in the surrounding tissues. Moreover, the analysis of residues from extractions targeting water-soluble and lipid-soluble arsenicals suggested that part of the measured arsenic signal comes from ingested sediments, phytoplankton, or other food sources. These food sources contain inorganic arsenic only, with As(V)-O in phytoplankton and As(III)-S in sediments, suggesting the possibility that the organoarsenicals compounds detected in the tissues of the organism are created by the Daphnia.
Authors:
Guilhem Caumette; Iris Koch; Maeve Moriarty; Kenneth J Reimer
Related Documents :
22059959 - Application of ultra high pressure (uhp) in starch chemistry.
17395459 - Batch and fed batch production of pectin lyase and pectate lyase by novel strain debary...
15934639 - A survey of pig production systems in the rain forest of the pacific coast colombia.
22517239 - Inhibitory activity of plumbagin produced by drosera intermedia on food spoilage fungi.
16184619 - Increasing herbal product consumption in thailand.
21614199 - Applications of chitin and its derivatives in biological medicine.
2900119 - Developmental study of digestive motor response to dietary pattern in young broilers.
16218659 - Antibacterial and antioxidant activities of essential oils isolated from thymbra capita...
2049669 - Toxic effects of trace element excess.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-27
Journal Detail:
Title:  The Science of the total environment     Volume:  432C     ISSN:  1879-1026     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-7-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  243-250     Citation Subset:  -    
Copyright Information:
Crown Copyright © 2012. Published by Elsevier B.V. All rights reserved.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Assessment of groundwater contamination risk using hazard quantification, a modified DRASTIC model a...
Next Document:  Is organic matter alone sufficient to predict isoproturon sorption in calcareous soils?