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

Rameshwar DASS; Jitander Kumar KAPOOR; Sunita GAMBHIR

Article Details

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

Authors:

Rameshwar DASS | Jitander Kumar KAPOOR | Sunita GAMBHIR

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2014 Vol.38 Issue 2, pp.328-337

Document Type:

Article

Publication Date:

5/2014

Document Language:

Turkish

Document ID (Org No.):

2000727230

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527

Abstract:

 

A new spectrophotometric method has been developed for  determination of molybdenum using surfactant-mediated liquid--liquid  extraction. Molybdenum(V) obtained by ascorbic acid reduction in 2.5 M  H2SO4 reacted spontaneously with thiocyanate and cetyl trimethyl  ammonium bromide (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 (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.

 

A new spectrophotometric method has been developed for  determination of molybdenum using surfactant-mediated liquid--liquid  extraction. Molybdenum(V) obtained by ascorbic acid reduction in 2.5 M  H2SO4 reacted spontaneously with thiocyanate and cetyl trimethyl  ammonium bromide (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 (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.

Article Details

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

Authors: Rameshwar DASS | Jitander Kumar KAPOOR | Sunita GAMBHIR

Publisher: TUBITAK

Journal: Turkish Journal of Chemistry 2014 Vol.38 Issue 2, pp.328-337

Document Type: Article

Publication Date: 5/2014

Document Language: Turkish

Document ID (Org No.): 2000727230

Frequency: Bimonthly

eISSN: 1303-6130

pISSN: 1300-0527

Issues

Authors:

Rameshwar DASS | Jitander Kumar KAPOOR | Sunita GAMBHIR

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2014 Vol.38 Issue 2, pp.328-337

Document Type:

Article

Publication Date:

5/2014

Document Language:

Turkish

Document ID (Org No.):

2000727230

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527