Development of a simple method for the determination of nitrite and nitrate in groundwater by high-resolution continuum source electrothermal molecular absorption spectrometry

Analytica Chimica Acta
Geovani C BrandaoSérgio L C Ferreira

Abstract

In this work, it was developed a method for the determination of nitrite and nitrate in groundwater by high-resolution continuum source electrothermal molecular absorption spectrometry of NO produced by thermal decomposition of nitrate in a graphite furnace. The NO line at 215.360 nm was used for all analytical measurements and the signal obtained by integrated absorbance of three pixels. A volume of 20 μL of standard solution or groundwater sample was injected into graphite furnace and 5 μL of a 1% (m/v) Ca solution was co-injected as chemical modifier. The pyrolisis and vaporization temperatures established were of 150 and 1300°C, respectively. Under these conditions, it was observed a difference of thermal stability among the two nitrogen species in the presence of hydrochloric acid co-injected. While that the nitrite signal was totally suppressed, nitrate signal remained nearly stable. This way, nitrogen can be quantified only as nitrate. The addition of hydrogen peroxide provided the oxidation of nitrite to nitrate, which allowed the total quantification of the species and nitrite obtained by difference. A volume of 5 μL of 0.3% (v/v) hydrochloric acid was co-injected for the elimination of nitrite, whereas that hydrogen p...Continue Reading

References

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Sep 1, 2012·Analytica Chimica Acta·Manzar SohailEric Bakker

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Citations

Aug 19, 2015·The Journal of Cell Biology·Rune Troelsgaard PedersenMichael Lisby
Jan 15, 2020·Analytical and Bioanalytical Chemistry·Wenshuai LiWeiming Xue
Apr 25, 2021·Environmental Monitoring and Assessment·Ailton José MoreiraGian Paulo Giovanni Freschi

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