Method for the in situ calibration of a passive phosphate sampler in estuarine and marine waters

O'Brien, Dominique S., Booij, Kees, Hawker, Darryl W., and Mueller, Jochen F. (2011) Method for the in situ calibration of a passive phosphate sampler in estuarine and marine waters. Environmental Science and Technology, 45 (7). pp. 2871-2877.

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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.

Item ID: 35569
Item Type: Article (Research - C1)
ISSN: 1520-5851
Funders: Australian Research Council (ARC), University of Queensland (UQ), Queensland Health Forensic and Scientific Services (QHFSS)
Projects and Grants: ARC DP0556205
Date Deposited: 01 Oct 2014 15:49
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 100%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments @ 50%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961103 Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and @ 50%
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