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镧-茜素络合腙分光光度法测定低含量氟,已被广泛应用。为了提高其灵敏度,往往采用溶剂萃取或加入丙酮的方法,但操作较繁。经研究加入一定量澳化十六烷基吡啶(CPB)可提高灵敏度,最大吸收峰由620纳米移至635纳米,工作曲线在30微克氟/毫升以内符合比耳定律,摩尔吸光系数ε=1.23×10~4。试剂 CPB 溶液:用40%乙醇溶液配成1%CPB溶液;显色剂溶液:取0.0965克茜素络合腙,用1毫升氨水溶解。另取250毫升丙酮,加入50毫升水,用
Lanthanum-alizarin complexation hydrazone spectrophotometric determination of low levels of fluorine has been widely used. In order to improve its sensitivity, solvent extraction or acetone is often used, but the operation is complicated. Adding a certain amount of cetylpyridinium bromide (CPB) to study can increase the sensitivity, the maximum absorption peak is moved from 620 nm to 635 nm, and the working curve complies with Beer’s law with a molar concentration of 30 μg Fm / ml. The molar absorptivity ε = 1.23 × 10 ~ 4. Reagent CPB solution: 40% ethanol solution dubbed 1% CPB solution; developer solution: Take 0.0965 grams of alizarin complex hydrazone, with 1 ml of ammonia dissolved. Another 250 ml of acetone, add 50 ml of water, with