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篇目详细内容 |
【篇名】 |
Analytical comparison between unprepared and calcined magnetitum (Cishi) |
【刊名】 |
Frontiers of Chemistry in China |
【刊名缩写】 |
Front. Chem. China |
【ISSN】 |
1673-3495 |
【EISSN】 |
1673-3614 |
【DOI】 |
10.1007/s11458-007-0017-5 |
【出版社】 |
Higher Education Press and Springer-Verlag |
【出版年】 |
2007 |
【卷期】 |
2
卷1期 |
【页码】 |
85-88
页,共
4
页 |
【作者】 |
LI Gang;
JIN Tongshun;
YOU Juan;
WANG Lu;
WU Qinan;
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【关键词】 |
Chinese traditional medicine; magnetitum; Cishi; X-ray powder diffraction; scan electron microscopy; trace elements |
【摘要】 |
The phases, chemical composition, surface appearance, crystal size, specific surface and thermal behavior of the unprepared and calcined forms of the mineral Magnetitum (Cishi), used as Chinese traditional medicine, were characterized by using X-ray powder diffraction, scan electron microscopy, inductively coupled plasma-atomic emission spectometry (ICP) and thermogravimetric (TG). The results indicated that after calcination the main phase Fe3O4 of the calcined Magnetitum (Duan Cishi) remained, while the Fe2O3 phase disappeared. The contents of the harmful chemical elements Cd and Pb were obviously reduced, while the crystal size increased from 24.5 to 35.7 nm and surface loosened. There were different TG curves for unprepared and calcined Magnetitum (Cishi) samples on heating. The former showed two weight-losing steps (at 367.9?422.1°C and 568.8?594.1°C), and the latter only one. These results might serve as a base for quality evaluation of Magnetitum (Cishi). |
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