Continuous colorimetric determination of trace ammonium in seawater with a long-path liquid waveguide capillary cell

Qian P. Li, Jia Zhong Zhang, Frank J Millero, Dennis A Hansell

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

An automated method for routine determination of nanomolar ammonium in seawater has been developed using segmented flow analysis coupled with a 2-m-long liquid waveguide capillary cell. Conventional photometric detector and autosampler were modified for this method. The optimal concentrations of the reagents and parameters for the development of indophenol blue are discussed. The method has low detection limit (5 nM), high precision (5% at 10-100 nM) and the advantage of rapid analysis of a large number of samples. The method has been used to examine the distribution of ammonium in Florida Bay and Biscayne Bay.

Original languageEnglish (US)
Pages (from-to)73-85
Number of pages13
JournalMarine Chemistry
Volume96
Issue number1-2
DOIs
StatePublished - Aug 11 2005

Fingerprint

Ammonium Compounds
Seawater
Indophenol
Waveguides
ammonium
seawater
liquid
Liquids
Detectors
method
analysis

Keywords

  • Ammonium
  • Automated analysis
  • Liquid waveguide
  • Seawater

ASJC Scopus subject areas

  • Chemistry(all)
  • Oceanography

Cite this

Continuous colorimetric determination of trace ammonium in seawater with a long-path liquid waveguide capillary cell. / Li, Qian P.; Zhang, Jia Zhong; Millero, Frank J; Hansell, Dennis A.

In: Marine Chemistry, Vol. 96, No. 1-2, 11.08.2005, p. 73-85.

Research output: Contribution to journalArticle

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