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| Technical study of soil nitrogen and phosphorus measurement using perturbation diffusion flow analysis |
| Received:December 19, 2021 |
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| KeyWord:available nitrogen in soil;available phosphorus in soil;perturbation diffusion flow analysis;chemical reaction chamber;absorption spectrum;flexible optical length |
| Author Name | Affiliation | E-mail | | LI Can | Henan International Joint Laboratory of Laser Technology in Agriculture Science, College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China | | | LI Zhengfeng | Henan Wendao Optoelectronics Sci & Tech Co., Ltd., Zhengzhou 450002, China | | | MA Liuzheng | Henan International Joint Laboratory of Laser Technology in Agriculture Science, College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China | | | ZHANG Wei | Henan International Joint Laboratory of Laser Technology in Agriculture Science, College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China | | | LI Xiaodong | Henan International Joint Laboratory of Laser Technology in Agriculture Science, College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China | | | VIJAYA Raghavan | Department of Bioresource Engineering, McGill University, Montreal H9X3V9, Canada | | | HU Jiandong | Henan International Joint Laboratory of Laser Technology in Agriculture Science, College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
State Key Laboratory of Wheat and Maize Crop Science, Zhengzhou 450002, China | jdhu@henau.edu.cn |
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| Abstract: |
| Currently, efforts to prevent and control agricultural non-point source(NPS)pollution have been intensively increased in China. Measurement technology of agricultural NPS pollution are urgent required. In this study, a perturbation diffusion flow analysis method was proposed to measure nitrogen and phosphorus automatically, after investigating both conventional dispersion convection and forced convection flow analysis methods. In this novel perturbation diffusion flow analysis, the sample solution and reagents were quantified using a microsyringe pump and then passed into a chemical reaction chamber for mixing. A program-controlled peristaltic pump repeatedly perturbs the reactant in the chemical reaction chamber. After the chemical reaction was completely stabilized, the reactant was injected into the photoelectric detection unit to determine the concentrations of nitrogen and phosphorus. Soil samples collected from Qianjiang, Hubei Province, were used to validate the performance of this novel perturbation diffusion flow analysis method. The experimental results showed that the correlation coefficient of soil ammonium nitrogen measurements with a combined extractant of sodium sulfate and sodium bicarbonate was 0.915 5, compared with the conventional UV-Vis spectrophotometry in the laboratory. The correlation coefficients of soil ammonium nitrogen, nitrate nitrogen, and water-soluble phosphorus measurements using the extractant of calcium chloride were 0.998 5, 0.990 1, and 0.9911 with a limit of detection of 0.055 4, 0.020 3 mg·L-1, and 0.008 4 mg·L-1 and relative standard deviation of 1.8%, 4.8%, and 1.0%, respectively. |
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