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

Rock and Mineral Analysis > 2021 > 40(1): 165-171. > DOI: 10.15898/j.cnki.11-2131/td.202003100029

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

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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

Received Date: March 09, 2020
Revised Date: April 15, 2020
Accepted Date: November 19, 2020
Published Date: January 27, 2021

Abstract

HIGHLIGHTS
(1) Ammonium nitrogen and nitrate nitrogen in soil were determined bygas phase molecular absorption spectrometry after simultaneous extraction with KCl solution.

(2) Compared with the standard methods based onthe spectrophotometry method, the limit of determination, and the precision and accuracy were improved significantly.

(3) Only 5 hours was needed for the analysis of 50 samples.

ABSTRACT

BACKGROUNDDetermination 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.
OBJECTIVESTo establish a convenient and high sensitivity method for the determination of ammonium nitrogen and nitrate nitrogen in soil, based on simultaneous extraction.
METHODSAmmonium nitrogen and nitrate nitrogen in soil were simultaneously extracted with KCl solution without decoloration, and determined by gas phase molecular absorption spectrometry.
RESULTS50 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%.
CONCLUSIONSCompared 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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Determination of Ammonium Nitrogen and Nitrate Nitrogen in Soil by Gas Phase Molecular Absorption Spectrometry