Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 60,
  • Issue 9,
  • pp. 1008-1012
  • (2006)

Nitrate Determination Using Anion Exchange Membrane and Mid-Infrared Spectroscopy

Not Accessible

Your library or personal account may give you access

Abstract

This study investigates the combined use of an anion exchange membrane and transmittance mid-infrared spectroscopy for determining nitrate concentration in aqueous solutions and soil pastes. The method is based on immersing a small piece (2 cm<sup>2</sup>) of anion exchange membrane into 5 mL of solution or soil paste for 30 minutes, after which the membrane is removed, rinsed, and wiped dry. The absorbance spectrum of the charged membrane is then used to determine the amount of nitrate sorbed on the membrane. At the levels tested, the presence of carbonate or phosphate does not affect the nitrate sorption or the spectrum of the charged membrane in the vicinity of the nitrate band. Sulfate affects the spectrum of the charged membrane but does not prevent nitrate determination. For soil pastes, nitrate sorption is remarkably independent of the soil composition and is not affected by the level of soil constituents such as organic matter, clay, and calcium carbonate. Partial least squares analysis of the membrane spectra shows that there exists a strong correlation between the nitrate charge and the absorbance in the 1000–1070 cm<sup>−1</sup> interval, which includes the v<sub>1</sub> nitrate band located around 1040 cm<sup>−1</sup>. The prediction errors range from 0.8 to 2.1 μeq, which, under the specific experimental conditions, corresponds to approximately 2 to 6 ppm N–NO<sub>3</sub><sup>−</sup> on a solution basis or 2 to 5 mg [N]/kg [dry soil] on a dry soil basis.

PDF Article
More Like This
Comparative study of multiple thiol-based self-assembled monolayer coatings for the SERS detection of nitrite, nitrate, and perchlorate anions in water

P. Muñoz, C. T. N. Noordam, R. J. M. Egberink, J. Huskens, and S. M. Garcia-Blanco
Appl. Opt. 58(34) 9345-9352 (2019)

Determination of glucose in whole blood samples by mid-infrared spectroscopy

Yoen-Joo Kim, Sangjoon Hahn, and Gilwon Yoon
Appl. Opt. 42(4) 745-749 (2003)

Fourier transform infrared spectroscopy of size-segregated aerosol deposits on foil substrates

Judith A. Hopey, Kirk A. Fuller, Venkataramanan Krishnaswamy, David Bowdle, and Michael J. Newchurch
Appl. Opt. 47(13) 2266-2274 (2008)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved