三棱等20种活血化瘀中药中K、Ca、Mg元素的含量测定

Determination of K,Ca,Mg contents in 20 Chinese medicines

目的:测定三棱等20种活血化瘀中药中K、Ca、Mg元素的含量,为中药药性与无机元素的相关性研究提供依据。方法:采用HNO3-HClO3湿法消化,用火焰原子吸收光谱法(FAAS)进行测定。结果:钾元素在0.011～10.0μg.mL-1呈良好的线性关系(r=0.9998),钙元素在0.032～30.0ug.mL-1呈良好的线性关系(r=0.9990),镁元素在0.0107～5.0ug.mL-1呈良好的线性关系(r=0.9998);K、Ca、Mg元素的加标回收率在97.2～101.1%之间,RSD≤1.8%。结论:本法快速简便、精密度好,重现性好,灵敏度高,测定结果准确可靠。

Objective： To determine the contents of K, Ca, Mg in 20 Chinese medicines of promoting blood circulation and remo- ving blood stasis. Methods： The mix -acid system （HNO3 ： HC]04 =4： 1） was used to slack every sample and flame atomic absorption spectrometric method was adopted to determine the contents of K, Ca, Mg. Results： The calibration curve was linear in the rang of 0. 032 - 30. 0 p.g .mL -1 for Ca （ r = 0. 9990）, 0. 0107 - 5. 0μg . mL - 1for Mg （ r = 0. 9998 ） and 0. 011- 10. 0μg .mL - 1 for K （r =0. 9998）. The recoveries of K, Ca and Mg were within 97. 2 - 101.1% and the RSD less thanl. 8%. Conclusion： The method is simple, rapid, accurate and reliable.