Determination of Ammonium Nitrogen and Nitrate Nitrogen in Soil by Gas Phase Molecular Absorption Spectrometry

WU Hao; ZHU Hong-xia; YUAN Mao; XU Ren-ji; XUE Li-dong

doi:10.15898/j.cnki.11-2131/td.202003100029

2021 Vol. 40, No. 1

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Article navigation > Rock and Mineral Analysis > 2021 > 40(1): 165-171

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WU Hao, ZHU Hong-xia, YUAN Mao, XU Ren-ji, XUE Li-dong. Determination of Ammonium Nitrogen and Nitrate Nitrogen in Soil by Gas Phase Molecular Absorption Spectrometry[J]. Rock and Mineral Analysis, 2021, 40(1): 165-171. doi: 10.15898/j.cnki.11-2131/td.202003100029

Citation:

WU Hao, ZHU Hong-xia, YUAN Mao, XU Ren-ji, XUE Li-dong. Determination of Ammonium Nitrogen and Nitrate Nitrogen in Soil by Gas Phase Molecular Absorption Spectrometry[J]. Rock and Mineral Analysis, 2021, 40(1): 165-171. doi: 10.15898/j.cnki.11-2131/td.202003100029

Determination of Ammonium Nitrogen and Nitrate Nitrogen in Soil by Gas Phase Molecular Absorption Spectrometry

1.
Environmental Monitoring Center of Hubei Province, Wuhan 430074, China
2.
China National Environmental Monitoring Centre, Beijing 100012, China

More Information

Corresponding author: XUE Li-dong, xueld@cnemc.cn

Received Date: 10 March 2020

Revised Date: 16 April 2020

Accepted Date: 20 November 2020

Publish Date: 28 January 2021

Abstract

Abstract

BACKGROUND
Determination of ammonium nitrogen and nitrate nitrogen in soil makes great sense for indication of the nutrient status and environment evaluation of soil. The standard methods based on spectrophotometry are susceptible to interference from the color of the extraction test solution, turbidity, and other coexisting ions. Moreover, those methods are time-consuming due to the demand of decoloration.
OBJECTIVES
To establish a convenient and high sensitivity method for the determination of ammonium nitrogen and nitrate nitrogen in soil, based on simultaneous extraction.
METHODS
Ammonium nitrogen and nitrate nitrogen in soil were simultaneously extracted with KCl solution without decoloration, and determined by gas phase molecular absorption spectrometry.
RESULTS
50 samples were determined within 5h due to the avoidance of the color reaction process. The dynamic linear ranges of ammonium nitrogen and nitrate nitrogen were 0.10-2.00mg/L and 0.20-4.00mg/L, respectively. The detection limits were 0.013mg/kg and 0.002mg/kg, respectively. The recoveries ranged from 96.3% to 100.7%, and the relative standard deviation was below 1%.
CONCLUSIONS
Compared with the national standard method based on traditional spectrophotometry, this method has significantly improved the detection limit, precision and recovery. The method can be widely used in the field of detection of ammonium nitrogen and nitrate nitrogen in farmland soil.
- soil /
- ammonium nitrogen /
- nitrate nitrogen /
- simultaneous extraction /
- gas phase molecular absorption spectrometry

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References

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