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UPTAKE OF PERFLUORINATED ALKYL ACIDS BY HYDROPONICALLY GROWN LETTUCE (Lactuca sativa).
MedLine Citation:
PMID:  23043263     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
An uptake study was carried out to assess the potential human exposure to perfluorinated alkyl acids (PFAAs) through the ingestion of vegetables. Lettuce (Lactuca sativa) was grown in PFAA-spiked nutrient solutions at four different concentrations, ranging from 10 ng/l to 10 µg/l. Eleven perfluorinated carboxylic acids (PFCAs) and three perfluorinated sulfonic acids (PFSAs) were analyzed by HPLC-MS/MS. At the end of the experiment, the major part of the total mass of each of the PFAAs (with the exception of the short-chain, C4-C7, PFCAs) taken up by plants appeared to be retained in the non-edible part, viz. the roots. Root concentration factors (RCF), foliage/root concentration factors (FRCF), and transpiration stream concentration factors (TSCF) were calculated. For the long chained PFAAs, RCF values were highest while FRCF were lowest. This indicates that the uptake by roots is likely governed by sorption of the PFAAs to lipid-rich root solids. The translocation from roots to shoots is restricted and highly depending on the hydrophobicity of the compounds. Although the TSCF show that the longer-chain PFCAs (e.g. perfluorododecanoic acid) get better transferred from the nutrient solution to the foliage than the shorter-chain PFCAs (e.g. perfluoroheptanoic acid), the major fraction of the longer-chain PFCAs is found in the plant roots due to additional adsorption from the spiked solution. Due to the strong electron-withdrawing effect of the fluorine atoms the role of the negative charge of the dissociated PFAAs is likely insignificant.
Authors:
Sebastian Felizeter; Michael McLachlan; Pim de Voogt
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-8
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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