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The Composition Analysis of Compound Fertilizer Based on Laser Induced Breakdown Spectroscopy

Author: ChenKai
Tutor: LuJiDong
School: South China University of Technology
Course: Engineering Thermophysics
Keywords: Laser-Induced Breakdown Spectroscopy compound fertilizer quantitative analysis internal standard method partial least squares method
CLC: TQ444
Type: Master's thesis
Year: 2011
Downloads: 80
Quote: 1
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Abstract


Agriculture is the fundamental basis of our economic development,and fertilizer with good quality is one of the important factors for the rapid development of agriculture. Component is the key element which determines the quality of fertilizer. In the production process if the component isn’t monitored on time, it is difficult to guarantee the quality of fertilizer. Fast and simultaneous multi-element analysis is one of the key issues which fertilizer industry need to be addressed. Laser-Induced Breakdown Spectroscopy (LIBS) can be used to monitor the component of fertilizer which is meaningful for real-time adjustment ratio of raw materials and improvement of production efficiency. Thus, the application of laser-induced breakdown spectroscopy in fertilizer is the research topics.The mechanisms, experimental set-ups, and calibration model of LIBS were introduced in detail. The interaction between laser and solid samples is a complex process and many experimental parameters will influent the precision and accuracy of detection, such as laser energy, delay time and lens to sample distance. In order to obtain better repeatable and stronger plasma signal, this article researches the influence of different experimental parameters on LIBS spectra of different elements in the detection and determine the optimal experimental parameters.The contents of P、K and N nutrient are high so the plasma signal is vulnerable to be affected by self-absorption. The article analysis the self-absorption degree of different characteristic spectral line and gives a deep theoretical analysis for selecting the most suitable lines in experimental study.In order to improve the accuracy and lower the matrix effect, internal standard method and partial least squares method are taken into the calibration of P、K and N nutrient in sample. It is indicated that laser-induced breakdown spectroscopy is suitable for rapidly component quantitative analysis in compound fertilizer with receptible applicability.Finally, the whole research works were summarized and the prospects for the further studies on fertilizer analysis were suggested.

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CLC: > Industrial Technology > Chemical Industry > The chemical fertilizer industry > Compound fertilizer ( compost )
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