Multispectral Structural Characterization of Humic Acid-Enhanced Urea

Jian-yuan JING; Liang YUAN; Shui-qin ZHANG; Yan-ting LI; Bing-qiang ZHAO

doi:10.3964/j.issn.1000-0593(2022)08-2610-06

Spectroscopy and Spectral Analysis, Volume. 42, Issue 8, 2610(2022)

Multispectral Structural Characterization of Humic Acid-Enhanced Urea

Jian-yuan JING*... Liang YUAN, Shui-qin ZHANG, Yan-ting LI and Bing-qiang ZHAO*; |Show fewer author(s)

Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture, Beijing 100081, China

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Figures & Tables(7)

Fig. 1. FTIR spectra (a) and second derivative spectra (b) of urea (U), humic acid-enhanced urea (HAU), and humic acid (HA)

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Fig. 2. The XPS full spectra (a) and C(1s) peak fitting spectra of HA (b), HAU20 (c), and U (d)

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Fig. 3. XPS N(1s) peak fitting spectra of HA (a), HAU20 (b), and U (c)

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Fig. 4. Oxygen K-edge NEXAFS spectra of HA, U, and HAU20

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Fig. 5. FTIR spectra of HA and UHA (a) and XPS C(1s) peak fitting spectra of UHA (b)

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Table 1. XPS peaks (C1s) attribution and the relative content (%) of carbon species for HA, HAU20 and U
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Table 1. XPS peaks (C1s) attribution and the relative content (%) of carbon species for HA, HAU20 and U
C—C/C—H C—O O＝C—O C＝O
HA 40.31 30.22 13.81 15.66
HAU20 38.77 31.50 12.80 16.93
U 0 0 0 100

Table 2. XPS peaks [N(1s)] attribution and the relative content (%) of nitrogen species for HA, HAU20, and U
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Table 2. XPS peaks [N(1s)] attribution and the relative content (%) of nitrogen species for HA, HAU20, and U
N_HA Primary amine-N Secondary amine-N
HA 100 0 0
HAU20 17.19 39.53 43.28
U 0 100 0

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Jian-yuan JING, Liang YUAN, Shui-qin ZHANG, Yan-ting LI, Bing-qiang ZHAO. Multispectral Structural Characterization of Humic Acid-Enhanced Urea[J]. Spectroscopy and Spectral Analysis, 2022, 42(8): 2610

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Paper Information

Category: Orginal Article

Received: Jul. 30, 2021

Accepted: --

Published Online: Mar. 17, 2025

The Author Email: JING Jian-yuan (jyjing90@163.com)

DOI:10.3964/j.issn.1000-0593(2022)08-2610-06

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. XPS peaks (C1s) attribution and the relative content (%) of carbon species for HA, HAU20 and U

Table 1. XPS peaks (C1s) attribution and the relative content (%) of carbon species for HA, HAU20 and U

Table 2. XPS peaks [N(1s)] attribution and the relative content (%) of nitrogen species for HA, HAU20, and U

Table 2. XPS peaks [N(1s)] attribution and the relative content (%) of nitrogen species for HA, HAU20, and U

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