Bishnoi Anil K, Dass Rameshwar, Sharma Ram G
Department of Industrial Chemistry, Guru Nanak Khalsa College, Yamuna Nagar-135001, Haryana, India.
Anal Sci. 2004 Jun;20(6):941-3. doi: 10.2116/analsci.20.941.
6-Chloro-3-hydroxy-2-(5'-methylfuryl)-4H-chromene-4-one (CHMFC) has been used as an analytical reagent for the spectrophotometric determination of molybdenum. Molybdenum(VI) in the presence of several cations, anions and complexing agents forms a yellow 1:2 complex with CHMFC. The complex is quantitatively extractable into 1,2-dichloroethane from 1 mol dm(-3) acetic acid medium and is stable for more than 6 h. The complex shows an absorption maximum at 438 nm with a molar absorptivity of 5.36 x 10(4) dm3 mol(-1) cm(-1) and Sandell's sensitivity equal to 0.0017 microg Mo cm(-2). The method obeys Beer's law up to 1.9 microg Mo ml(-1). The relative standard deviations are 0.2% for solutions and 0.5-1.5% for solid samples. The method is simple, selective, precise and rapid, and has been satisfactorily applied to the micro determination of molybdenum in various synthetic and standard samples.
6-氯-3-羟基-2-(5'-甲基呋喃基)-4H-色烯-4-酮（CHMFC）已被用作分光光度法测定钼的分析试剂。在几种阳离子、阴离子和络合剂存在下，钼(VI)与CHMFC形成黄色的1:2络合物。该络合物可从1 mol dm(-3)乙酸介质中定量萃取到1,2-二氯乙烷中，且在6小时以上保持稳定。该络合物在438 nm处有最大吸收，摩尔吸光系数为5.36 x 10(4) dm3 mol(-1) cm(-1)，桑德尔灵敏度等于0.0017 μg Mo cm(-2)。该方法在钼含量高达1.9 μg Mo ml(-1)时符合比尔定律。溶液的相对标准偏差为0.2%，固体样品的相对标准偏差为0.5 - 1.5%。该方法简单、选择性好、精确且快速，已成功应用于各种合成样品和标准样品中钼的微量测定。
