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Dergiler / Turkish Journal of Chemistry / 2014 / Cilt: 38 - Sayı: 2

Speciation of chromium by the combination of dispersive liquid--liquid microextraction and microsample injection flame atomic absorption spectrometry

Yunus Emre ÜNSAL
Mustafa TÜZEN
Mustafa SOYLAK
Sayfa
173–181
Yayın Tarihi
2014-05-18
DOI
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Total chromium was determined in various wheat, bread, and hair samples.

📌 3 Maddede Bu Makale

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Amaç & Hipotez:A microextraction procedure was established for the speciation of total Cr, Cr(III), and Cr(VI).
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Temel Bulgular & Veri:Optimum values for the dispersive liquid--liquid microextraction method were pH 6, LOD 0.34 m g L-1, and preconcentration factor 400.
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Sonuç & Katkı:Total chromium was determined in various wheat, bread, and hair samples.
🔬Tür:Araştırma Makalesi
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Microextraction · chromium · Sudan blue II

Özet

A microextraction procedure was established for the speciation of total Cr, Cr(III), and Cr(VI). Sudan blue II was used as a ligand for speciation works. Some factors affecting the recoveries of chromium species, including type of extraction and dispersive solvents, pH, ligand amount, extraction time, and matrix ions, were examined. Optimum values for the dispersive liquid--liquid microextraction method were pH 6, LOD 0.34 m g L-1, and preconcentration factor 400. Chromium(III) was quantitatively recovered under optimal conditions, while the recovery of chromium(VI) was below 10%. The relative standard deviation for Cr(III) determinations for the 10-replicate measurement of 0.3 m g mL-1 Cr(III) was 6.2%. The accuracy was verified using BCR-144R Sewage Sludge, IAEA 336 Lichen, and TMDA 25.3 certified water for trace elements. The procedure was applied to speciation of chromium in water samples. Total chromium was determined in various wheat, bread, and hair samples.

Abstract

A microextraction procedure was established for the speciation of total Cr, Cr(III), and Cr(VI). Sudan blue II was used as a ligand for speciation works. Some factors affecting the recoveries of chromium species, including type of extraction and dispersive solvents, pH, ligand amount, extraction time, and matrix ions, were examined. Optimum values for the dispersive liquid--liquid microextraction method were pH 6, LOD 0.34 m g L-1, and preconcentration factor 400. Chromium(III) was quantitatively recovered under optimal conditions, while the recovery of chromium(VI) was below 10%. The relative standard deviation for Cr(III) determinations for the 10-replicate measurement of 0.3 m g mL-1 Cr(III) was 6.2%. The accuracy was verified using BCR-144R Sewage Sludge, IAEA 336 Lichen, and TMDA 25.3 certified water for trace elements. The procedure was applied to speciation of chromium in water samples. Total chromium was determined in various wheat, bread, and hair samples.

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Bu Makaleye Atıf Yap

ÜNSAL, Y. E., TÜZEN, M., SOYLAK, M. (2014). Speciation of chromium by the combination of dispersive liquid--liquid microextraction and microsample injection flame atomic absorption spectrometry. Turkish Journal of Chemistry, Cilt: 38 - Sayı: 2, 173–181. https://ajindex.com/articles/184646

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Kaynakça (14)

  1. Dispersive liquid–liquid microextraction FAAS 262 0.08 13 Ultrasonic probe-assisted ionic liquid dispersive ETAAS 300 0.07 22 liquid–liquid micro extraction Solid phase extraction FAAS 71 0.7 31 Cloud point extraction ICP-AES 20 0.81 39 Coprecipitation FAAS 100 0.5 40 Solid phase extraction FAAS 31 94 41 Dispersive liquid–liquid microextraction EAAS 171 0.059 42 Dispersive liquid–liquid microextraction FAAS 400 0.34 Present method Conclusions The presented method of dispersive liquid–liquid microextraction for trace amounts of chromium for its speciation is new, simple, and accurate prior to its flame atomic absorption spectrometric detection. Cr(III) is easily and quantitatively separated from Cr(VI) at pH 6.0 under optimal conditions. The use of organic solvent in this procedure is very low. The effects of concomitant ions are tolerable. Acknowledgments The authors thank the Unit of Scientific Research Projects of Erciyes University and Gaziosmanpa¸sa University for their financial support. Dr Mustafa T¨ uzen thanks the Turkish Academy of Sciences for its financial support. References Zhu, X. S.; Hu, B.; Jiang, Z. C.; Li, M. F. Water Res. 2005, 39, 589–595.
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