A New Spectrophotometric Determination of Chromium (VI) As Cr2O72- After Cloud-Point Extraction using a Laboratory-Made Organic Reagent

Zuhair A-A Khammas; Shawkat K. Jawad

A New Spectrophotometric Determination of Chromium (VI) As Cr2O72- After Cloud-Point Extraction using a Laboratory-Made Organic Reagent

Zuhair A-A Khammas * §

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Shawkat K. Jawad §

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Ibtehaj R. Ali ‡

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§ University of Baghdad

‡ University of Kufa

A New Spectrophotometric Determination of Chromium (VI) As Cr2O72- After Cloud-Point Extraction using a Laboratory-Made Organic Reagent

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Abstract

A new trend in extraction and preconcentration of chromium (VI) using laboratory-made azo dye reagent 2-[benzenethiazolylazo]-4-benzenenaphthol (BTABN) after cloud-point extraction (CPE) and its determination by spectrophotometrically. The method involved the reaction of Cr 2 O 7 2-with BTABN in acidic medium forming a hydrophobic ion-association complex [HBTABN][HCr 2 O 7 ] which is entrapped into micelle-mediating solvent (Triton X-100) and the Cr(VI) detected spectrophotometrically at λ max of 475 nm. The effect of the several factors on the CPE efficiency is optimized by one-factor-at-a-time (OFAT). Extensive thermodynamic study has been presented to understand the mechanism of extraction and solubilisation of ion-association complex in micelles. The interferences effect of divers ions is also considered. Under the optimized conditions, enrichment factor of 270 is achieved leading to limit of detection and limit of quantitation of 0.017 and 0.0568 μg mL -1 respectively. The linearity of 0.1-2.0 μg mL – 1 and sensitivity in term of molar absorptivity is 4.47×104 L.mol -1 .cm -1 are obtained .The precision (RSD%; n=7) of the proposed method is of 0.31% % at 2.0 μg Cr (VI) mL -1 . This method is applied in the determination of Cr (VI) in various environmental and botanical samples.

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Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Zuhair A-A Khammas, Shawkat K. Jawad, Ibtehaj R. Ali. 2014. "A New Spectrophotometric Determination of Chromium (VI) As Cr2O72- After Cloud-Point Extraction using a Laboratory-Made Organic Reagent". Global Journal of Science Frontier Research - B: Chemistry GJSFR-B Volume 13 (GJSFR Volume 13 Issue 50 (B8)).

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GJSFR Volume 13 Issue 50 (B8)

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Journal Specifications

Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

Keywords

chromium oxyanion ion-association complex cloud-point extraction new azo dye reagent Spectrophotometry

Classification

GJSFR-B Classification FOR Code: 030599

Submission ReceivedOctober 27, 2013
Peer Review Double Blind
Handling Editor
Accepted November 19, 2013
Published October 21, 2013

Version of record

v1.2

Issue date

October 21, 2013

Language

English

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Article Matrices

Total Score: 103

Country: Iraq

Subject: Global Journal of Science Frontier Research - B: Chemistry

Authors: Zuhair A-A Khammas, Shawkat K. Jawad, Ibtehage R. Ali (PhD/Dr. count: 0)

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