Studies on chemical removal of excess nitric acid using formic acid in solutions analyzed by inductively coupled plasma optical emission spectrometry

Tibor Kántor, András Bartha, Maria I. Ballók

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The presented studies were aimed at the optimization of reaction between nitric and formic acids in the solutions of low inorganic matrix content. The HNO, removal reaction took place at temperature above 60°C: The reaction products were gases and the reaction proceeded in 10 min. The change in the total acid content was controlled by acid-base titration; HNO, and HCOOH concentrations were determined separately using ICP spectral emission lines of nitrogen and carbon, respectively. Analytical curves of 10 elements were determined using a conventional ICP-OES method for the series of standard solutions with low (0.1 mol L-1) and high (2.2 mol L-1) HNO, content, as well as for the reaction mixtures containing initially 2.2 mol L-1 HNO, and 3.3 mol L-1 HCOOH. Compared with the reference conditions (0.1 mol L-1 HNO,), the average relative sensitivity was decreased by about 10% for high HNO, concentration, and a slight enhancement (about 4%) was caused by the residuals of HCOOH. Limitations concerning determination of mercury and the presence of hydrogen peroxide were discussed.

Original languageEnglish
Pages (from-to)1265-1283
Number of pages19
JournalChemia Analityczna
Volume54
Issue number6
Publication statusPublished - Dec 1 2009

Keywords

  • Carbon ICP-OES
  • Carbon effect8Nitrogen ICP-OES
  • Formic acid effect
  • Nitric acid effect
  • Nitric acid removal

ASJC Scopus subject areas

  • Analytical Chemistry

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