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本文在Ti(Ⅳ)-DAM二元络合物的基础上进行改进,即用Ti(Ⅳ)-DAM-SnCl_2三元络合物萃取光度法测定硅石中微量钛。在1.5～4mol/L HCl中,络合物最大吸收波长位于418nm处。Fe(Ⅲ),Cu(Ⅱ),Si(Ⅳ),Mg(Ⅱ)(50mg),Zn(Ⅱ)(10mg);Al(Ⅲ)(100mg)经萃取分离后均不干扰微量钛的测定。5h之内吸光度不变。因而具有灵敏度高,选择性好,稳定性高的优点,并且简便快速。分析步骤:称取0.2000g试样置于铂坩埚中,用少量水润湿,加1ml H_2O_4(1+1),10ml HF(40%),于低温电炉上加热至冒尽白烟,将坩埚移入600℃高温炉中加热20min,取出冷却,加2g混合溶剂(Na_2CO_3-K_2CO_3)加
In this paper, Ti (Ⅳ) -DAM binary complex is modified on the basis of Ti (Ⅳ) -DAM-SnCl_2 ternary complex extraction spectrophotometry for the determination of trace titanium in silica. In 1.5 ~ 4mol / L HCl, the maximum absorption wavelength of the complex is at 418nm. The determination of trace titanium did not interfere with the extraction of Fe (Ⅲ), Cu (Ⅱ), Si (Ⅳ), Mg (Ⅱ) (50mg), Zn (Ⅱ) (10mg) and Al (Ⅲ) 5h absorbance unchanged. Thus has the advantages of high sensitivity, good selectivity, high stability, and simple and fast. Analysis steps: Weigh 0.2000g sample placed in a platinum crucible, moistened with a small amount of water, add 1ml H_2O_4 (1 +1), 10ml HF (40%), heated to a low temperature electric furnace to make up white smoke, the crucible Into 600 ℃ high temperature furnace heating 20min, remove the cooling, add 2g mixed solvent (Na_2CO_3-K_2CO_3) plus