邻氯苯基荧光酮光度法测定钢样中的钛

研究以邻氯苯基荧光酮-十六烷基三甲基溴化铵为显色体系,在表面活性剂十六烷基三甲基溴化铵存在下,钛(Ⅳ)和邻氯苯基荧光酮所形成橙红色的络合物,实验结果表明,在酸性介质中最大吸收波长位于560nm,钛((Ⅳ)含量在0～12μg/25mL范围内符合比尔定律,其表观摩尔吸光系数ε_(560)=1.2×10~5L/mol/cm。钢样的人工合成样中钛((Ⅳ)的平均回收率为103.3%,相对标准偏差为2.0%。采用抗坏血酸掩蔽剂消除被测样中干扰离子的影响,实验结果表明:38~#和45~#钢样中钛((Ⅳ)的含量分别为0.08%和0.05%,其加标平均回收率分别为101.3%和98.9%。相对标准偏差分别为2.34%、1.34%。本方法选择性及准确性好、灵敏度高、简便易行。

Determination of titanium in steel by 2,3,7-trihydroxy-9-o-chlorophenylfluorenone spectrophotometry

ByusingtheCTMABassurfactant,the2,3,7-Trihydroxy-9-O-Chlorophenylfluorenone-CTMAB as chromogenic agent,Ti(Ⅳ) can form a orange colour colored complex with 2,3,7-Trihydroxy-9-O-Chlorophenylfluorenone. The results indicated that in acid medium the maximum absorption wavelength was 560 nm,the apparent molar absorption was 1.2×10~5L/mol/cm and following Beer's law the linear range was 0～12μg/25mL.The average recovery rate of Ti(Ⅳ) of synthetic steel sample was 103.3%.The relative standard deviation was 2.0%. Ascorbic acid solution was used as reducer to eliminate the effect of interference during the course of determination. The results indicated that the containments of Ti(Ⅳ) in steel of 38~# and 45~# were 0.08% and 0.05%.The average recoveries rates were 101.3% and 98.9% separately.The relative standard deviation were 2.34% and 1.34%. This method is selective,accurate,sensitive and simple.