| 光谱学与光谱分析 |
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| Determination of Major Elements in Superphosphate by X-Ray Fluorescence Spectrometry |
| RUI Yu-kui1,LI He2,SHEN Jian-bo1,ZHANG Fu-suo1* |
1. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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Abstract Phosphate fertilizer is one of the most important fertilizers. The authors determined nine kinds of major elements in superphosphate, the most important phosphate fertilizer, by X-ray fluorescence spectrometry. The detection range of SiO2,Al2O3,TFe2O3,MnO, MgO, CaO, Na2O, K2O and P2O5 is 15.0%-90.0%, 0.20%-25.0%, 0.20%-25.0%, 0.01%-0.35%, 0.20%-40.0%, 0.10%-35.0%, 0.10%-7.50%, 0.05%-7.50% and 1.00%-100.00% respectively, and the precision of the method for SiO2,Al2O3,TFe2O3,MnO, MgO, CaO, Na2O, K2O and P2O5 range from 0.20% to 0.005%, so the method of X-ray fluorescence spectrometry is a fast and effectual method for detecting the composition of phosphate fertilizer. The contents of the above elements showed (1) the detected superphosphate content is 18.101% of P2O5,which is accordant to the labeled level (≥16%); (2) the detected superphosphate contains much SiO2,TFe2O3,MgO, CaO and K2O, which are necessary for plant growth and the content of which is 16.954%, 1.495%, 1.580%, 21.428% and 1.585% respectively. These data showed that phosphate fertilizer sometimes can supply some trace elements for plants, but we should eliminate the interference effect of these elements when we research the role of phosphorus; (3) superphosphate contains 3.225% of Al2O3,so the authors should attention to the aluminium poison when superphosphate is used chronically.
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Received: 2007-08-06
Accepted: 2007-11-11
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Corresponding Authors:
ZHANG Fu-suo
E-mail: ruiyukui@163.com
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