CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Environmental Chemistry   
Environmental Chemistry
Journal Banner
  Environmental problems - Chemical approaches
blank image Search
blank image blank image
blank image
  Advanced Search

Journal Home
About the Journal
Editorial Structure
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Virtual Issues
Sample Issue
For Authors
General Information
Submit Article
Author Instructions
Open Access
For Referees
Referee Guidelines
Review an Article
For Subscribers
Subscription Prices
Customer Service

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter logo LinkedIn


Article << Previous     |     Next >>   Contents Vol 4(1)

Intercomparison between FI-CL and ICP-MS for the determination of dissolved iron in Atlantic seawater

Andrew R. Bowie A B, Simon J. Ussher C, William M. Landing D, Paul J. Worsfold C E

A Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC), Hobart, Tas. 7001, Australia.
B Australian Centre for Research on Separation Science (ACROSS), School of Chemistry, University of Tasmania, Hobart, Tas. 7001, Australia.
C School of Earth, Ocean and Environmental Sciences (SEOES), University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK.
D Department of Oceanography, Florida State University, Tallahassee, FL 32306-4320, USA.
E Corresponding author. Email: pworsfold@plymouth.ac.uk
PDF (203 KB) $25
 Export Citation

Environmental context. Iron is arguably the most important trace element for the growth of marine organisms and is the limiting micronutrient for primary production in many parts of the world’s oceans. The concentration of dissolved iron in seawater therefore influences the global carbon cycle and consequently Earth’s climate. Hence, it is important to understand the marine biogeochemistry of iron and quantify its spatial and temporal distribution. In order to achieve this objective, it is essential that reported open-ocean concentrations of dissolved iron are accurate.

Abstract. Results from a 3-laboratory blind intercomparison exercise with two widely used analytical methods for the determination of iron in seawater are presented. The two methods used are coprecipitation followed by isotope dilution inductively coupled plasma mass spectrometry (ICP-MS) and chemical reduction to iron(ii) followed by flow injection with chemiluminescence detection (FI-CL). The five samples used were collected from the South Atlantic Ocean as part of the IRONAGES intercomparison exercise. To avoid any inter-bottle variability, the same sample bottles were sent sequentially to three laboratories in England, Australia and the United States over a 12-month period. The results show that there is no statistical difference (P = 0.05) between the shipboard FI-CL method and the directly traceable, low blank, isotope dilution ICP-MS method for the determination of iron in surface South Atlantic seawater. There was also excellent agreement between the overall mean of the three laboratories (0.54 ± 0.03 nM) and the consensus value from an earlier community-wide separate bottle intercomparison using the same IRONAGES sample water (0.59 ± 0.21 nM).

Keywords: biogeochemistry, environmental cycles, iron, seawater analysis.

Subscriber Login

Legal & Privacy | Contact Us | Help


© CSIRO 1996-2015