应用发射光谱直接粉末法测定了钨精矿中微量钪。为提高分析灵敏度和准确度,试验了混合物作缓冲剂,结果以碳粉:碘化铵:碳酸锶=85:10:5的混合物作缓冲剂效果最好,此时弧焰稳定,信背比高,缓冲剂用量为试样量的3倍。选用镧作内标元素,在选定的条件下,镧的蒸发行为与钪一致。采用дг-2交流电弧作激发光源,摄谱时,5安接触起弧,然后升至11安,曝光90秒。试验了基体主要成份对钪测定的影响。结果表明(表1),大量铁、锰的存在不影响钪的测定,即基体主要成份改变时,不影响钪的测定。 Determination of Trace Scandium in Tungsten Concentrates by Direct Emission Spectrometry. In order to improve the sensitivity and accuracy of analysis, the mixture was tested as a buffer, and the best effect was obtained with a mixture of carbon powder: ammonium iodide: strontium carbonate = 85: 10: 5 as a buffering agent with stable arc flame, High, the amount of buffer for the sample volume 3 times. The use of lanthanum as internal standard elements, under the selected conditions, the evaporation of lanthanum and scandium consistent. The дг-2 AC arc was used as the excitation light source. During the photo-taking, 5 A contacts arcing, and then rose to 11 A with an exposure of 90 seconds. The influence of the main components of matrix on the determination of scandium was tested. The results showed that (Table 1), the presence of a large amount of iron and manganese did not affect the determination of scandium, ie, the determination of scandium did not change when the main components of the matrix were changed.