地质标准物质的最小取样量问题

地质标准物质已是当今地质分析数据质量保证与监控系统中最重要的手段之一。正确使用标准物质的重要条件是遵循标准物质最小取样量的规定。然而当今高灵敏度、小取样量（20-30mg）的现代主流分析技术正向着当前普遍使用的地质标准物质100mg最小取样量的要求提出挑战。本文从历史演变和当前需求讨论了地质分析取样量问题以及地质标准物质最小取样量及其应用意义，并提出了解决当前这一矛盾的技术措施与步骤。同时也提醒分析方法研究者、质量管理者和标准物质研制者关注取样量问题，以使更新换代快的技术方法和相对滞后的监管方法（包括标准物质）得到协调发展。

The minimum sampling mass of Geostandards reference materials

At present, geological reference materials are playing very important role in the quality assurance and monitoring system of geological analytical data. The prerequisite to use the reference materials properly is to follow the regulation that the sampling mass must reach the certain mass to make sure the sampling is representative. However, for modern analytical techniques of high sensitivity, the practice sampling mass is only about 20-30mg and is much less than 100 mg which is the minimum sampling mass of geological reference materials widely used. So a great challenge for the minimum sampling mass of geological reference materials has emerged with the development of modern analytical techniques. In this paper, we discuss the problem on the sampling mass of geological analysis as well as the minimum sampling mass of geological reference material and its implication from the view of history evolution and current demand. In addition, the technological measures and steps to solve the problem are presented. At the same time, we try to remind the researchers of analytical methods, quality managers and the developer of reference materials to pay attention to the problem of the sampling mass, so that the analytical techniques quickly developed and the monitoring methods laged behind (including reference materials) could go forward together.