Zinc/Chromium (II) reduction for nitrate determination in agricultural materials by colorimetry or ion‐selective electrode

Michael J. Hepher*, Ronald H. Alexander, James Dixon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

To phase analytical pathways within this laboratory, recent approaches to nitrate analysis have been studied; of particular interest were the U V spectrophotometric approach (Heanes 1982, 1986) and zinc/chromium (II) reduction procedure (Pruden et al 1985). By combining and modifying various aspects of the aforementioned procedures with an adaption of an indophenol blue colorimetric procedure (Mitchell 1972) it was possible to measure nitrate‐nitrogen 0.10‐8.00 g kg−1 DM routinely on a range of agricultural materials (at present hays, straws, grasses, calabrese, potato leaves, cereals, soils and perlites) on a sophisticated high‐volume‐throughput microprocessor‐controlled auto‐sampler/spectrophotometric system.

Original languageEnglish
Pages (from-to)379-383
Number of pages5
JournalJournal of the Science of Food and Agriculture
Volume49
Issue number3
DOIs
Publication statusPrint publication - 1989

Keywords

  • agricultural samples
  • colorimetry
  • ion‐selective electrode
  • Nitrate
  • zinc/chromium II reduction

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