Spectrophotometric determination of molybdenum using surfactant-mediated liquid--liquid extraction

Authors : Rameshwar DASS, Jitander Kumar KAPOOR, Sunita GAMBHIR

Pages : 328-337

Doi:10.3906/kim-1302-33

View : 11 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A new spectrophotometric method has been developed for determination of molybdenum using surfactant-mediated liquid--liquid extraction. Molybdenuminsert ignore into journalissuearticles values(V); obtained by ascorbic acid reduction in 2.5 M H2SO4 reacted spontaneously with thiocyanate and cetyl trimethyl ammonium bromide insert ignore into journalissuearticles values(CTAB);, forming an intense orange yellow complex that was extracted quantitatively into 1,2-dichloroethane and absorbed at 460 nm. The absorbance of the extract was found to be stable for more than 24 h. Beer`s law was obeyed over the concentration range 0.1--4.2 m g Mo mL-1 of the extract. The linear range for an accurate determination was found to be 1.2--2.6 m g Mo mL-1. The molar absorptivity and LOD of the procedure were 4.01 \times 104 L mol-1 cm-1 and 0.00239 m g Mo mL-1, respectively. The stoichiometry of the orange yellow complex insert ignore into journalissuearticles values(Mo:SCN:CTAB); was found to be 1:3:2. The effect of a large number of cations, anions, and complexing agents was studied. For 10 replicate determinations of 1 m g Mo mL-1, the standard deviation was 0.014 concentration units with a relative mean error of \pm 0.38%. The method developed was applied for determination of molybdenum in various alloy steels and a wide variety of biological and environmental samples, including different types of water samples.
Keywords : Molybdenum, thiocyanate, spectrophotometry, extraction, cetyl trimethyl ammonium bromide, 1, 2 dichloroethane