Determination of urea and humate in humate fertilizers by IR-FTIR spectroscopy

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Abstract

Conditions for determining the content of urea and humates in aqueous fertilizers in their combined pr esence by IR spectroscopy of frustrated total internal reflection are proposed. The urea and humate spectra were identified. Characte ristic bands of urea and humate were selected for their determination in the joint presence. The error in determining urea is minimal w hen registering an analytical signal at 1628 and 1598 cm–1 (10-200 g/l), humate — at 1380 cm–1 (10-100 g/l). When calculating the content of humate and urea in their mixtures by the Firordt method, the e rror in determining each component is 3%. The proposed determination conditions have been tested on model fertilizers and commercial humate fertilizers.

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About the authors

Е. А. Karpukhina

Lomonosov Moscow State University

Author for correspondence.
Email: Karpukhina.evgeniya@gmail.com
Russian Federation, Moscow, 119234

G. А. Khromov

Lomonosov Moscow State University

Email: Karpukhina.evgeniya@gmail.com
Russian Federation, Moscow, 119234

D. S. Volkov

Lomonosov Moscow State University

Email: Karpukhina.evgeniya@gmail.com
Russian Federation, Moscow, 119234

М. А. Proskurnin

Lomonosov Moscow State University

Email: Karpukhina.evgeniya@gmail.com
Russian Federation, Moscow, 119234

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Supplementary files

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2. Fig. 1. IR-NPVO absorption spectra of Powhumus humate (grey line) and urea (black line) powders in the mid-IR region (4000-400 cm-1).

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3. Fig. 2. IR-NPVO absorption spectra of aqueous solutions of Powhumus humate (50 g/L, grey line), urea (100 g/L, black line) and their mixture (50 : 100 g/L, light grey line) in the mid-IR region (4000-400 cm-1).

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4. Fig. 3. Graduation plots of aqueous solutions of urea in the range of 10-200 g/L for bands at 1662, 1628, 1598, 1467 and 1157 cm-1.

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5. Fig. 4. Graduation plots of aqueous solutions of Powhumus humate in the range of 10-100 g/L for the bands at 1570, 1380, 1100, 1035 and 1011 cm-1.

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6. Fig. 5. IR-NPVO absorption spectra of mixtures of aqueous solutions of Powhumus humate and urea in the mid-IR region (1800-800 cm-1). The spectrum of the solution with urea concentration of 20 g/l is green, 50 g/l is red.

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7. Fig. 6. IR-NPVO absorption spectra of liquid fertilisers A and B, aqueous solutions of urea and Powhumus humate in the mid-IR region (1800-800 cm-1).

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