矿物中药自然铜的组成与热稳定性研究

Composition and Thermal Stability of the Mineral Traditional Chinese Medicine Pyrite (Zirantong)

采用X射线粉末衍射、热重-差热分析、等离子体发射光谱等分析手段,对不同产地自然铜和煅自然铜的结构组成、热稳定性和微量元素进行测定和分析.结果表明:自然铜的主要物相为FeS2,煅自然铜则因产地而异,出现了FeS2(南京中医药大学样品中约86%,湖南89%,四川32%,山西19%),FeS(湖南11%,安徽24%,四川24%),Fe3O4(安徽29%),Fe2O3(安徽14%)和FeO(OH)(南京中医药大学14%,山西74%)等复杂物相.自然铜在加热到450～800℃时,逐渐发生了由FeS2转变为FeS的相变.在这些药材中含有丰富的与人体健康密切相关的微量元素,既含有对人体有益的Ca,Fe,Zn等微量元素,也含有As,Cd,Pb等有害微量元素.实验结果为该矿物药的鉴定和评价提供了科学数据.

The composition, structure, thermal stability and trace elements of the unprepared and calcined pyrite （Zirantong） samples from different places, used as traditional Chinese medicine, were determined and calculated by using XRD, TG-DTA and ICP. The results indicated that in the unprepared pyrite, the phase is mainly made up of FeS2, but in the calcined pyrite, the phase varies with the origin of the medicine, such as FeS2 （86% from Nanjing University of Traditional Chinese Medicine, 89% from Hunan, 32% from Sichuan, 19% from Shanxi）, FeS （11% from Hunan, 24% from Anhui, 24% from Sichuan）, Fe304 （29% from Anhui）, Fe203 （14% from Anhui）, FeO（OH） （14% from Nanjing University of Traditional Chinese Medicine, 74% from Shanxi） and so on. When heated from 450 to 800 ℃, the phase FeS2 can be gradually changed into FeS. In these mineral medicines there are a plenty of trace elements correlative with health of the human body, which are not only some beneficial trace elements, such as Ca, Fe, Zn, etc., but also some harmful trace elements, such as As, Cd, Pb, etc. The results may provide basis for quality evaluation of the medicine.