XRF法测定岩石、土壤中微量溴

Determination of Trace Amounts of Bromine in Rocks and Soils by XRF

本文采用717阴离子交换树脂分离基体元素,银型活性碳纸富集试液中溴后X射线荧光光谱进行溴的测定。样片基体组成简单,检测限低、精度好。拟定的方法用于土壤、岩石标样测定结果满意。

A method for the determination of traces of bromine in rocks and soils,in which Br-is enriched with a disk of Ag+loaded active charcoal paper(Ag+ACP),and determined by XRF.It was found that the Ag+ACP possesses a strong absorptivity as well as a large capacity.The background of the disk is low,and no matrix correction needed.The collection procedure of Br^(-)on the Ag^(+)ACP disk can be achieved simply by placing the flask containing the solution and the disk on an electromagnetic vibrator for 2-3 hours.Standard solution tests show that more than 90%of Br"can Be recovered by the procedure with a RSD of 5%(n=l2).The detection limit is0.05ppm.Data obtained from the analysis of CRMs GSS-1,GSS-4,GSS-7 and GSR-5 by this method agreed well with certified values.