Analytical Sciences 2005-04-01

Natural analcime zeolite modified with 5-Br-PADAP for the preconcentration and anodic stripping voltammetric determination of trace amount of cadmium.

Darush Afzali, Ali Mostafavi, Mohammad Ali Taher, Ebrahim Rezaeipour, Mohammad Khayatzadeh Mahani

Index: Anal. Sci. 21(4) , 383-6, (2005)

Full Text: HTML

Abstract

A procedure for separation and preconcentration of trace amounts of cadmium has been proposed. A column of analcime zeolite modified with benzyldimethyltetradecylammonium chloride and loaded with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) was used for retention of cadmium. The cadmium was quantitatively retained on the column at pH approximately 9 and was recovered from column with 5 ml of 2 M nitric acid with a preconcentration factor of 140. Anodic stripping differential pulse voltammetry was used for determination of cadmium. A 0.05 ng/ml detection limit for the preconcentration of aqueous solution of cadmium was obtained. The relative standard deviation (RSD) for eight replicate determinations at the 1 microg/ml cadmium levels was 0.31% (calculated with the peak height obtained). The calibration graph using the preconcentration system was linear from 0.01 to 150 microg/ml in final solution with a correlation coefficient of 0.9997. For optimization of conditions, various parameters such as the effect of pH, flow rate, instrumental conditions and interference of number of ions, were studied in detail. This method was successfully applied for determination of cadmium in various complex samples.

Related Compounds

  • 2-(5-bromo-2-pyrid...
  • N-Benzyl-N,N-dim...

Related Articles:

Determination of Lead in Water Samples Using a New Vortex-Assisted, Surfactant-Enhanced Emulsification Liquid-Liquid Microextraction Combined with Graphite Furnace Atomic Absorption Spectrometry.

2016-04-01

[Arch. Environ. Contam. Toxicol. 70 , 607-14, (2016)]

Development of an extractive spectrophotometric method for estimation of uranium in ore leach solutions using 2-ethylhexyl phosphonic acid-mono-2-ethylhexyl ester (PC88A) and tri-n-octyl phosphine oxide (TOPO) mixture as extractant and 2-(5-bromo-2-pyridylozo)-5-diethyl aminophenol (Br-PADAP) as chromophore.

2012-06-01

[Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 91 , 222-7, (2012)]

Flame atomic absorption spectrometric determination of trace amounts of manganese in alloys and biological samples after preconcentration with the ion pair of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and ammonium tetraphenylborate on microcrystalline naphthalene or by column method.

2001-08-01

[Anal. Sci. 17(8) , 969-73, (2001)]

Modulation by Zn2+ of GABA responses in bipolar cells of the mouse retina.

2000-01-01

[Vis. Neurosci. 17(2) , 273-81, (2000)]

Chelates of cobalt(III) and iron(II) with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol as test probes for the characterization of chromatographic effects on a reversed-phase liquid chromatography stationary phase.

2005-12-16

[J. Chromatogr. A. 1099(1-2) , 111-20, (2005)]

More Articles...