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吡啶偶氮化合物4-[(5-氯-2-吡啶)偶氮]-1,3-二氨基苯(5-Cl-PADAB)作为钴的试剂,具有灵敏度高、选择性较好的特性,已有以磷酸为掩蔽剂用其作铁矿中测定钴的试剂。但上述文献均未涉及到大量钛存在下光度法测定的问题;在大量钛存在下,不能采用磷酸,因其与钛生成磷酸钛沉淀,妨碍测定。我们对大量钛、铁共存下钴的测定进行了研究,提出以氟化钠作掩蔽剂,方法适用于含钴>10~(-3)%的钛铁矿的分析。而氟与大量铝、钛、铁等络合后,对器皿的腐蚀也极微,可以在普通玻璃器皿中进行测定。
Pyridine azo compound 4 - [(5-chloro-2-pyridyl) azo] -1,3-diaminobenzene (5-Cl-PADAB) as a cobalt reagent with high sensitivity and good selectivity characteristics, Phosphoric acid has been used as a masking agent for the determination of cobalt in iron ore reagents. However, none of the above documents addresses the problem of photometric determination of the presence of large amounts of titanium; in the presence of large amounts of titanium, phosphoric acid can not be used because it produces titanium phosphate precipitation with titanium, hindering the determination. We studied the determination of cobalt in the presence of a large amount of titanium and iron, and proposed the use of sodium fluoride as a masking agent. The method is suitable for the analysis of ilmenite containing> 10 ~ (-3)% cobalt. The fluorine and a large number of aluminum, titanium, iron and other complex, the corrosion of the vessel is also minimal, can be measured in ordinary glassware.