论文部分内容阅读
镉在地壳岩石中和土壤中的平均含量分别为0.2和0.5ppm,区域化探扫面和成矿区(带)样品的分析结果要求为0.2ppm。而等离子光谱法测定化探样品中低温易挥发元素镉尚存在一定困难;目前多采用电热石墨炉原子吸收法测定,但该法的精密度较差,且工效低;溶剂萃取火焰原子吸收测定镉可以满足化探要求,但因有机溶剂易挥发和产生毒害,所以在日常生产分析上难以推广。因此研究一个快速、准确且无环境污染的富集化探样品中的痕量镉,与火焰原子吸收相结合的测定方法是一项具有实际意义的工作。
The average content of cadmium in crustal rocks and soil was 0.2 and 0.5 ppm, respectively, and the analytical results of the regionalized geochemical prospecting and metallogenic zone samples were 0.2ppm. However, there are still some difficulties in the determination of cadmium at low temperature in geochemical exploration samples by plasma spectrometry. At present, the determination by graphite furnace atomic absorption spectrometry is more popular, but the precision is poor and the work efficiency is low. Solvent extraction flame atomic absorption spectrometry Can meet the requirements of geochemical exploration, but because of organic solvents volatile and toxic, so difficult to promote in the daily production analysis. Therefore, it is a practical work to study a fast, accurate and environmentally-friendly method for the determination of trace cadmium in geochemical samples enriched in geochemical samples in combination with flame atomic absorption spectrometry.