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

Amornthammarong Natchanon, Peter B. Ortner, James Hendee, Ryan Woosley

Research output: Contribution to journalArticle

3 Scopus citations

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. This journal is

Original languageEnglish (US)
Pages (from-to)5263-5270
Number of pages8
JournalAnalyst
Volume139
Issue number20
DOIs
StatePublished - Sep 15 2014

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

Fingerprint Dive into the research topics of 'A simplified coulometric method for multi-sample measurements of total dissolved inorganic carbon concentration in marine waters'. Together they form a unique fingerprint.

  • Cite this