X射线荧光光谱法测定沥青中痕量元素

摘要

提出了粉末压片制样-X射线荧光光谱法测定沥青中17种微量元素。将粒径小于180μm沥青粉末经60℃烘干后置于模具中,以20MPa压力制成厚度为4mm的样片。选用B-401～B-408沥青标准物质作为校准样品,并建立了集校准曲线、基体校正及谱线重叠校正为一体的回归方程作为方法的定量基础。求得方法的检出限0.2～18μg.g-1。用同一沥青样品重复测定11次,测得其相对标准偏差小于9.5%。方法用于沥青校正物质（B-403）分析,所得结果与标准值相符。%XRFS determination of 17 trace elements in bitumen with preparation of disc sample by direct pressing of sample powder was proposed in this paper.The bitumen was powdered to size less than 180 μm,dried at 60 ℃ and pressed in a mould under a pressure of 20 MPa to form a disc sample with its thickness of 4 mm.Working curve was prepared with a set of standard samples（B-401 to B-408）.A 3 in 1 regression equation functioning as working curve,matrix correction and spectral overlapping correction was established and used as the basis for quantification.Detection limits of the method was found to be in the range of 0.2-18 μg·g-1.Values of RSD′s（n=11） were found to be less than 9.5% by analysis of a bitumen sample.The proposed method was used in analyzing a standard sample（B-403）,giving results in consistency with the standard values.