Comparison of open tubular cadmium reactor and packed cadmium column in automated gas-segmented continuous flow nitrate analysis

Jia Zhong Zhang, Charles J. Fischer, Peter B. Ortner

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Detailed procedures are provided for preparing packed cadmium columns to reduce nitrate to nitrite. Experiments demonstrated the importance of conditioning both open tubular cadmium reactor (OTCR) and packed copper-coated cadmium columns to achieve 100% reduction efficiency. The effects of segmentation bubbles in the OTCR upon reduction efficiency and baseline noise in nitrate analysis are investigated using an auto-analyzer. Metal particles derived from segmentation bubbles in OTCR result in interference with continuous flow analyses. Therefore packed columns are recommended for determination of low level nitrate in natural waters.

Original languageEnglish (US)
Pages (from-to)99-113
Number of pages15
JournalInternational Journal of Environmental Analytical Chemistry
Volume76
Issue number2
DOIs
StatePublished - Jan 1 2000

Keywords

  • Cadmium column
  • Continuous flow analysis
  • Nitrate
  • Nitrite

ASJC Scopus subject areas

  • Analytical Chemistry
  • Environmental Science(all)
  • Environmental Chemistry

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