偶氮氯膦-mK双波长分光光度法测定硅石中的钛  

Determination of Titanium in Silica by Double-Wavelength Overlapping Spectrophotometry with Chlorophosphonazo-mK as a Chromatogenic Reagent

作　　者：余协瑜[1] 贾云[1] 邱会东[1] 

机构地区：[1]重庆工业高等专科学校,重庆400050

出　　处：《岩矿测试》2004年第3期191-193,共3页Rock and Mineral Analysis

摘　　要：在稀H2SO4介质中,乳化剂OP存在下,Ti(Ⅳ)与偶氮氯膦-mK发生显色反应,可用波峰(672nm)波谷(550nm)双波长吸光度叠加的方法测定Ti(Ⅳ)。显色反应的表观摩尔吸光系数为4.7×104L·mol-1·cm-1,灵敏度较单波长测定提高1.1倍。0～1200μg/LTi(Ⅳ)符合比尔定律。测定了硅石、焦宝石等试样中的钛,结果与标准值符合,6次测定的RSD<5%。A method for the determination of titanium in silica based on the color reaction of Ti (Ⅳ) with CPA-mK and OP in the medium of 0.01～0.1 mol/L H_(2)SO_(4) by double-wavelength overlapping spectrophotometry was proposed. The apparent absorptivity is 4.7×10^(4) L·mol^(-1)·cm^(-1) with sensitivity enhancement factor of 1.1 compared with single-wavelength method. Beer′s law is obeyed in the concentration range of 0～1 200 μg/L for Ti. The method has been applied to the determination of titanium in silica and other samples with satisfactory results.The precision of less than 5% RSD(n=6) was obtained.

关 键 词：钛 双波长分光光度法 偶氮氯膦-mK 乳化剂OP 

分 类 号：O657.32[理学—分析化学] O614.411[理学—化学]