化探样品中微量银的光谱测定

Spectrographic Determination of a Minor Silver Concentration in Chemical Exploration Sample

本法采用液体滴加在样品中,促进了银的分馏蒸发,从而降低了银的检出限,可达0.02ppm。本法受基体成份影响小,稳定性好,加入回收为90-110%,测定范围0.03-10ppm。Ⅰ、Ⅱ级标样分析结果的RSD<15%,平均值与推荐值的对数偏差绝大多数小于±0.1,同时由于省去了称样和混匀时间,大大提高了工作效率。

In this method, the distillation of silver is improved by adding liquid to sample. The limit of detection is decreased to 0.02 ppm, and the effect of matrix composition is minute, the stability is good. The addition retrieve rate is 90-110% and the range of determination is between 0.03-10 ppm. The relative standard deviation (RSD) of analytical result of I and II rank standard sample is less than 15%. The logarithmic deviations between mean and suggestive value are great partially less than±0.1. As no time is necessary for balancing sample and mixing, the working effi- ciency get a raising.