1:5万化探普查样品中多元素测定的方法、质量监控及应用效果

过去,我队1:5万化探普查样品只采用单一的光谱撒样法进行多元素分析。它的主要弊病是某些元素测定灵敏度低,不能满足化探普查要求；方法精密度较差,经常产生系统偏差。因此,给弱异常的分辨造成困难。

THE TECHNIQUES FOR MULTI-ELEMENT DETERMINATIONOF SAMPLES FROM 1:50,000 GEOCHEMICALSURVEY AND THE CONTROL OF QUALITY

Semiquantitative spectrographic analysis with "sample-spraying technique" has been conventionally used for years in the 1:50,000 geochemical survey. Its main defects in operation, however, appear to be the low sensitivity in determination of a number of elements, the poor accuracy and its systematic error. While keeping tc the main approach of "sample-spraying" the author has incorporated vertical-electrode spectrography, colorimetry and atomic absorpt-on spectrometry as required by analysis for different element. More rigorous routine monitoring measures have been adopted in the semiquantita-tive analysis with"sample-spraying" technique. Usefulness of the improved technique is illustrated in this paper with special reference to the re-analyses of the regional geochemical samples taken from both the western Henan and the western Yunnan areas.