Simultaneous determination of dissolved inorganic chromium species in wastewater/natural waters by surfactant sensitized catalytic kinetic spectrophotometry
Küçük Resim Yok
Tarih
2017
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
A simple, rapid, highly accurate and sensitive kinetic method is proposed for determining chromium(VI). The method is based on its catalytic effect on the oxidation of Celestine blue (CB+) by H2O2 in the presence of 2,2'-bipyridyl (Bipyr) and cetylpyridinium chloride (CPC) at pH 6.50. The reaction was monitored spectrophotometrically by measuring the absorbance of indicator dye at 645 nm. The analytical variables, which have influences on the sensitivity, were investigated and the optimum conditions were established. The optimized conditions made it possible to determine and speciate chromium in a linear range of 5-200 mu g L-1 with a detection limit of 0.65 mu g L-1. The recoveries and relative standard deviations (RSDs) for the determination of 10, 25, 75 and 150 mu g L-1 Cr(VI) (n: 5) were in the range of 99.0-99.8% and 0.2-3.5%, respectively. The selectivity was also studied and greatly enhanced by adding a suitable masking mixture. The method was successfully applied to the simultaneous analysis of Cr(III) and Cr(VI) in natural water and waste water samples with a recovery changing in the range of 95-103% for Cr(III) and 100-104% for Cr(VI). Its accuracy was validated by the analysis of certified reference materials with good agreement between certified and found values. (C) 2012 Production and hosting by Elsevier B.V. on behalf of King Saud University.
Açıklama
Anahtar Kelimeler
Chromium speciation, Catalytic effect, Kinetic spectrophotometry, CB+, Bipyr, CPC
Kaynak
Arabian Journal of Chemistry
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
10
