Indirect determination of N-total in plant materials by flame atomic absorption spectrometry involving a AgCl(s) mini-column

Authors

  • Josiane Meire Tolotti Carneiro Universidade de São Paulo; CENA; Laboratório de Química Analítica
  • Elias Ayres Guidetti Zagatto Universidade de São Paulo; CENA; Laboratório de Química Analítica
  • Ivanildo Luiz de Mattos Universidade de São Paulo; CENA; Laboratório de Química Analítica
  • Denise Melo Universidade de São Paulo; CENA; Laboratório de Química Analítica

DOI:

https://doi.org/10.1590/S0103-90162001000100023

Keywords:

N-total, flow-injection analysis, atomic absorption spectrometry, mini-column

Abstract

A flow-injection system with a AgCl(s) mini-column is proposed for the determination of total nitrogen in plant digests by flame atomic absorption spectrometry. The method is based on Ag+ removal by ammonia through the formation of the diammine argentate(I) complex and further monitoring of the released Ag+. Nitrogen was determined in seven reference samples, in three replicates, with precision and accuracy comparable to the conductimetric procedure. The system is robust, and only slight sensitivity variations (< 2 %) have been noted during extended (4 h) operating periods. Sampling rate is about 100 h-1 and measurement repeatability is fair (relative standard deviation usually < 0.02).

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Published

2001-03-01

Issue

Vol. 58 No. 1 (2001)

Section

Soils and Plant Nutrition

License

All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.

How to Cite

Indirect determination of N-total in plant materials by flame atomic absorption spectrometry involving a AgCl(s) mini-column . (2001). Scientia Agricola, 58(1), 151-155. https://doi.org/10.1590/S0103-90162001000100023