Title
Phosphate determination in seawater: Toward an autonomous electrochemical method
Date Issued
15 December 2011
Access level
metadata only access
Resource Type
journal article
Author(s)
Publisher(s)
Elsevier B.V.
Abstract
Initial steps to create an autonomous in situ electrochemical sensor for orthophosphate determination in seawater are presented. First, the optimal conditions to form the molybdophosphate complex in artificial seawater medium were determined by addition of sulphuric acid and sodium molybdate to the solution containing orthophosphate. Secondly, the anodic oxidation of molybdenum to form molybdate ions and protons was used to create the molybdophosphate complex without addition of any liquid reagents. The molybdophosphate complex is detectable by amperometry with an average precision of 2.2% for the concentration range found in the open ocean and the detection limit is 0.12 μM. Three solutions are proposed to address the silicate interferences issue and one of these methods is used for the natural samples collected in the coastal waters offshore Peru during the Pelagico 1011-12-BIC OLAYA cruise in November-December 2010. Results showed a good precision with an average of 2.5% and a reasonable deviation of the amperometric analysis as compared with colorimetric measurements (4.9%). © 2011 Elsevier B.V. All rights reserved.
Start page
161
End page
167
Volume
87
Issue
1
Language
English
OCDE Knowledge area
Ingeniería marina, naves
Subjects
Scopus EID
2-s2.0-81355160247
Source
Talanta
ISSN of the container
00399140
Sponsor(s)
We express our deep gratitude to Professor Maurice Comtat of Laboratoire de Génie Chimique, University Paul Sabatier, Toulouse, for his indispensable suggestions on the electrochemical part of this work. We are grateful to officers, scientists and crew of Pelagico 1011-12-BIC OLAYA cruise aboard R/V Jose Olaya Balandra for their assistance in the collection of samples; especially we would like to thank Miguel Sarmiento for his help during the water samples collection on board. Justyna Jonca is supported by a Marie Curie PhD grant within the SENSEnet ITN (EC Framework Programme 7, grant agreement No 237868 ). We warmly thank IRD and LMI DISCOH for help in logistics details and the staff of the laboratory of the Chemical Research Unit (UIOQ) at IMARPE for organisation of the cruise.
Sources of information:
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