Method for the in Situ Calibration of a Passive Phosphate Sampler in Estuarine and Marine Waters

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Title Method for the in Situ Calibration of a Passive Phosphate Sampler in Estuarine and Marine Waters
Author O'Brien, Dominique S.; Booij, Kess; Hawker, Darryl William; Mueller, Jochen F.
Journal Name Environmental Science & Technology
Year Published 2011
Place of publication United States
Publisher American Chemical Society
Abstract Passive samplers for phosphate were calibrated in the laboratory over a range of flow velocities (0−27 cm s−1) and ionic strengths (0−0.62 mol kg−1). The observed sampling rates were between 0.006 and 0.20 L d−1. An empirical model allowed the estimation of these sampling rates with a precision of 8.5%. Passive flow monitors (PFMs), based on gypsum dissolution rates, were calibrated for the same range of flow velocities and ionic strength. Mass loss rates of the PFMs increased with increasing ionic strength. We demonstrate that this increase is quantitatively accounted for by the increased gypsum solubility at higher ionic strengths. We provide a calculation scheme for these solubilities for an environmentally relevant range of temperatures and salinities. The results imply that co-deployed PFMs can be used for estimating the flow effect on the in situ sampling rates of the phosphate samplers, and we expect that the same may hold for other passive samplers.
Peer Reviewed Yes
Published Yes
Alternative URI
Copyright Statement Self-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the author[s] for more information.
Volume 45
Issue Number 7
Page from 2871
Page to 2877
ISSN 0013-936X
Date Accessioned 2011-06-23
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Chemistry (incl Atmospheric Chemistry)
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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