pH dependence of steroid hormone-organic matter interactions at environmental concentrations

Neale, Peta A., Escher, Beate I. and Schafer, Andrea I. (2009) pH dependence of steroid hormone-organic matter interactions at environmental concentrations. Science of the Total Environment, 407 3: 1164-1173. doi:10.1016/j.scitotenv.2008.09.035


Author Neale, Peta A.
Escher, Beate I.
Schafer, Andrea I.
Title pH dependence of steroid hormone-organic matter interactions at environmental concentrations
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 0048-9697
Publication date 2009-01
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2008.09.035
Volume 407
Issue 3
Start page 1164
End page 1173
Total pages 10
Place of publication Amsterdam, The Netherlands
Publisher Elsevier Scientific
Language eng
Subject 05 Environmental Sciences
0502 Environmental Science and Management
Abstract The interaction of estradiol, estrone, progesterone and testosterone with environmentally relevant concentrations of Aldrich humic acid, alginic acid and tannic acid was studied using solid-phase microextraction (SPME). Since bulk organic matter and certain hormones such as estradiol and estrone contain dissociable functional groups, the effect of pH on sorption was investigated as this will influence their fate and bioavailability. For humic acid and tannic acid, sorption was strongest at acidic pH when the bulk organic matter was in a non-dissociated form and decreased when they became partially negatively charged. At acidic and neutral pH the strength of partitioning was influenced by hormone functional groups content, with the strongest sorption observed for progesterone and estrone. At alkaline pH conditions, when the bulk organics were dissociated, sorption decreased considerably (up to a factor of 14), although the non-dissociated hormones testosterone and progesterone indicated greater sorption to humic acid at pH 10 compared to the partially deprotonated estradiol and estrone. This study demonstrates that SPME can be used to assess organic matter sorption behaviour of a selected range of micropollutants and at environmentally relevant organic matter concentrations.
Keyword Steroid hormones
Organic matter
pH
Partition coefficient
Dissolved humic substances
Solid-phase microextraction
Synthetic membrane-vesicles
Fulvic-acids
Waste-water
Tannic-acid
Partition-coefficients
Aquatoc environment
Molecular-weight
Alginic acid
Q-Index Code C1
Q-Index Status Provisional Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
National Research Centre for Environmental Toxicology Publications
 
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Created: Tue, 17 Nov 2009, 09:49:03 EST