【摘要】 在溴化十六烷基三甲基铵存在下,用分光光度法研究了4-(2-噻唑偶氮)连苯三酚与钛(Ⅳ)的显色反应性能。结果表明:在pH 2.0~5.0氯乙酸-氯乙酸钠缓冲溶液条件下,4-(2-噻唑偶氮)连苯三酚与钛(Ⅳ)形成摩尔比为2∶1的红色络合物,其最大吸收波长λmax为560 nm,在25 mL显色液中钛量在0~20μg范围内服从比尔定律,相关系数r=0.999 0,测定的表观摩尔吸光系数ε560=4.07×104L.mol-1.cm-1,方法成功应用于钢样品中微量钛的测定,结果同认定值相符。更多还原

【Abstract】 The chromogenic reaction of titanium(Ⅳ) with the reagent 4-(2-thiazolylazo)-1,2,3-trihydroxybenzene(TATB) has been studied spectrophotometrically in the presence of CTMAB in detail.The results show that in the medium of ClCH2COOHClCH2COONa buffer solution at pH 2.0-5.0,Ti(Ⅳ) reacts with the reagent TATB to form a stable red complex with the molar ratio of n(Ti(Ⅳ)): n(TATB)=1∶2.The maximum absorption of the complex is at 560 nm with an apparent molar absorptivity of 4.07×104 L·mol-1·cm-1.Beer′s law is obeyed in the range of 0-20 μg/25 mL for Ti(Ⅳ).The proposed method has been applied to the determination of titanium in steel samples,and the results are in agreement with the certified values.更多还原