Comparison of Open Tubular Cadmium Reactor and Packed Cadmium Column in Automated Gas-Segmented Continuous Flow Nitrate Analysis

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 segmentat...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2000-02, Vol.76 (2), p.99-113
Main Authors: Zhang, Jia-Zhong, Fischer, Charles J., Ortner, Peter B.
Format: Article
Language:English
Subjects:
Cadmium column
continuous flow analysis
nitrate
nitrite
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Summary: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.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067310008034123