| 光谱学与光谱分析 |
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| The Study on the Laser-Induced Breakdown Spectroscopy Properties of Compound Fertilizer with Different Physical Forms |
| LI Jun, LU Ji-dong*, YAO Shun-chun, DONG Mei-rong |
| School of Electric Power, South China University of Technology, Guangzhou 510640, China |
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Abstract In order to study the mechanism of laser-induced breakdown spectroscopy for detecting the chemical components content of compound fertilizer in detail, two physical forms of compound fertilizer samples (powder and granular) were used for this study. The authors analyzed the laser-induced breakdown spectroscopy properties of samples with different physical forms made under different preparation pressure. And the spectral characteristics and plasma characteristics of N，P and K in the powder and granules made under the preparation pressure of 0, 0.5, 2, 4, and 6 MPa, respectively were compared experimentally. The experiments results showed that the spectral characteristics of the two forms have obvious difference when the pressure is small and the grain samples have significant higher line intensity than those of the powder samples. With the increase in the pressure, the difference in the plasma characteristics between these two physical forms was reduced, and all the characteristic spectral lines intensity of the same physical form samples increases firstly and reduces afterward.
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Received: 2011-08-16
Accepted: 2011-12-20
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Corresponding Authors:
LU Ji-dong
E-mail: jdlu@scut.edu.cn
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