Determination of chromium, copper, manganese, nickel and zinc by flame atomic absorption spectrometry after separation of bentonite modified with trioctylamine
Küçük Resim Yok
Tarih
2005
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Scientific Publ-India
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Bentonite modified with trioctylamine is developed for the separation and pre-concentration of chromium, copper, manganese, nickel,fact zinc prior to their determination by Flame Atomic Absorption Spectrometry (FAAS). The retention and recovery of the analyte elements have been investigated by applying column techniques where in Cr-III, Cu-II, Mn-II,Mn- Ni-II and Zn-II are quantitatively retained by the collector at pH 6 or above. For a column with 0.3 g of bentonite modified with trioctylamine and a flow rate of 5.0 mL min(-1), it can quantitatively adsorb the trace heavy metals and quantitative desorption of the elements can be realized by elution with 10 mL of 1 mol L-1 HNO3. Low blank values of the collector have served as important advantage and recoveries are found to be 99.9 +/- 2%, 98.8 +/- 3%, 99.6 +/- 2%, 97.2 +/- 3% and 87.3 +/- 4% for Cr, Cu, Zn, Mn and Ni, respectively, at 95% confidence level. In the presence of Na+, K+ and Mg+ the analyte elements are quantitatively separated and recovered. The relative standard deviations for the determinations are found to be 0.1-1.9%. Detection limits (3 sigma) are 1.7 mu g L-1 for Cr, 2.2 mu g L-1 for Cu, 2.1 mu g L-1 for Zn, 2.4 mu g L-1 for Mn and 2.8 mu g L-1 for Ni. The method has been applied to analysis of the Cr, Cu, Mn, Ni and Zn studied in waste waters.
Açıklama
Anahtar Kelimeler
Online Preconcentration, Trace-Elements, Montmorillonite, Coprecipitation, Sorption, Samples, Metals
Kaynak
Journal Of The Indian Chemical Society
WoS Q Değeri
Q4
Scopus Q Değeri
Q4
Cilt
82
Sayı
2
