Jump to main content
Jump to site search

Issue 20, 2014
Previous Article Next Article

A simplified coulometric method for multi-sample measurements of total dissolved inorganic carbon concentration in marine waters

Author affiliations

Abstract

A new system requiring greatly reduced operator intervention has been developed for the determination of dissolved inorganic carbon concentration in marine waters. Based on a coulometric method, the system has an accuracy and precision comparable to more complex and expensive methods currently employed. A syringe pump equipped with a 12-port distribution valve is used to precisely dispense an acid solution and sample into a gas stripper. The system can autonomously measure eight discrete samples in duplicate or triplicate with no operator input. The best precision (%RSD) obtained was 0.022% (n = 14) or less than ±1.0 μmol kg−1. The system is calibrated against a certified reference material (CRM). Average offset from the CRM was 1.2 μmol kg−1. Sample throughput was 4 samples per h. Carryover effects are negligible but field sample analyses suggest that prefiltering may be necessary in highly turbid waters.

Graphical abstract: A simplified coulometric method for multi-sample measurements of total dissolved inorganic carbon concentration in marine waters

Back to tab navigation

Publication details

The article was received on 09 Jun 2014, accepted on 07 Aug 2014 and first published on 08 Aug 2014


Article type: Paper
DOI: 10.1039/C4AN01049C
Author version
available:
Download author version (PDF)
Citation: Analyst, 2014,139, 5263-5270
  •   Request permissions

    A simplified coulometric method for multi-sample measurements of total dissolved inorganic carbon concentration in marine waters

    N. Amornthammarong, P. B. Ortner, J. Hendee and R. Woosley, Analyst, 2014, 139, 5263
    DOI: 10.1039/C4AN01049C

Search articles by author

Spotlight

Advertisements