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Journal of Chemistry
Volume 2013, Article ID 420768, 6 pages
Research Article

Extractive Spectrophotometric Method for Determination of Molybdenum in Steels and Environmental Samples

1Department of Industrial Chemistry, Guru Nanak Khalsa College, Yamuna Nagar, Haryana 135001, India
2Department of Chemistry, National Institute of Technology, Kurukshetra, Haryana 136119, India
3Department of Chemistry, Arya Kanya Mahavidyalya, Shahabad (M), Haryana 136135, India

Received 16 January 2012; Accepted 13 June 2012

Academic Editor: Beatriz Royo

Copyright © 2013 Rameshwar Dass et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An extractive spectrophotometric method has been developed for microdetermination of molybdenum. At room temperature Mo(VI) was reduced to Mo(V) in 2 M H2SO4 using ascorbic acid as a reductant. The Mo(V) formed a yellow-coloured (1 : 2) complex with 6-chloro-3-hydroxy-2-( 3 -hydroxyphenyl)-4-oxo-4H-1-benzopyran (CHHB). The complex was quantitatively extracted into toluene and absorbed maximum at 𝜆 m a x 404 nm. Beer’s law was obeyed over the concentration range of 2.31 μg Mo ml−1 with a molar absorptivity and Sandell's sensitivity of 5 . 6 2 × 1 0 4  L  m o l 1 c m 1 and 0.0016 μg Mo  c m 2 , respectively. The relative standard deviation was 0.0025 (in absorbance units) for 10 replicate determinations of 1 μg Mo ml−1. The method was free from the interference of large number of analytically important elements. Molybdenum has been determined satisfactorily in different technical, synthetic, and environmental samples with improved accuracy and precision.