化学物相法测定矿石中红柱石的含量

用快速简便的标准加入无火焰原子吸收光谱法测定人血和动物血中有害元素铅和镉。与普通的标准加入法相比,此法在样品前处理、标准曲线绘制及样品结果计算上都有了很大的简化。方法检出限为铅2.00μg/L,镉0.30μg/L;回收率为铅99.5%~101.2%,镉99.7%~101.3%;精密度为铅0.95%,镉2.18%。方法灵敏度高,精密度好,适用于特定人群血液中铅和镉含量的普查。

Determination of Andalusite Content in Ores by Chemical Phase Analysis Method

The preliminary discussion on the determination of andalusites content in ore samples by chemistical phase analysis method is proposed. The sample was treated with HF-cold dissolution method. Then the residue was filtered and fused with Na2O2 and extracted with hot water. The concentration of Al2O3 was determined by titration method with zinc acetate standard solution and converted into the content of andalusite. Based on the compositional characteristics of andalusite and its associated minerals in Yuedu ore region of Qinhai Province, the effects of experimental conditions including different solvents, dosage of solvents, soaking temperature and time, sample granularity on sample dissolution rate were studied in details. And the correction coefficient was calculated based on the dissolution rate of andalusite in synthesized samples. The aluminiumimetry is chosen as the chemical phase analysis of andalusite in ores.