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差示分光光度法测定高含量成份具有较佳的精密度与准确度,并且简便而快速。以过铌酸形式差示分光光度法测定高含量铌的工作有铌—铀合金中的铌、铌与钽混合物中的铌、高纯铌金属中的铌等。但皆在浓硫酸或浓硫酸—浓磷酸的介质中进行测定。因而存在着粘度大、转移时气泡不易赶尽、消耗试剂较多、腐蚀器皿严重和不安全等缺点。对周期表中第四、五、六和七族元素的过氧络合物的吸收光谱进行的研究结果,指出了在不同浓度的硫酸中络合物吸收峰和吸收度的变化情况。有人提出在较稀的硫酸和磷酸中用过氧化氢分光光度测定铌的方法。我们对此工作进行了验证。在此基础上,对
Differential spectrophotometry determination of high content of ingredients with better precision and accuracy, and simple and fast. In the niobium acid form of differential spectrophotometry for the determination of high levels of niobium work niobium - uranium alloy niobium, niobium and tantalum mixture of niobium, niobium and other high-purity niobium metal. But all in concentrated sulfuric acid or concentrated sulfuric acid - concentrated phosphoric acid medium for the determination. Therefore, there is a large viscosity, transfer bubbles are not easy to get rid of more reagent consumption, corrosion and other serious and unsafe containers. The results of the absorption spectra of the peroxo complexes of the fourth, fifth, sixth and seventh elements of the periodic table indicate the changes of the absorption peak and the absorption of the complexes in different concentrations of sulfuric acid. A method of spectrophotometric determination of niobium using hydrogen peroxide in dilute sulfuric acid and phosphoric acid has been proposed. We verified this work. On this basis, right