Determination of added chromium(III) and chromium(VI) in natural water by ion-pairing high-performance liquid chromatography with detection by atomic absorption spectrometry

Abstract

A simple, rapid and selective method for the determination of Crlll and Crvl in natural waters by ion-pairing high-performance liquid chromatography (HPLC) with flame atomic absorption spectrometry (FAAS) as the method of detection is described. The samples and standards are acidified with glacial acetic acid to a pH of 3.1-3.2. The eluent consists of dilute tetrabutylammonium phosphate also acidified to a pH of 3.1-3.2.Separation is accomplished on a 4 cm long column packed with polymeric CI8 material. The effluent from the column is fed directly into the atomic absorption spectrometer.Chromium(V1) added to pond water began to decay to CrIll immediately upon addition. The rate of decay depended on the level of suspended organic material in the water. The recovery of the sum of both Ct -111 and CrVl species in 65 spiked water samples was 100.9% with a standard deviation of 6.Z0/&.

Cr(III) and Cr(VI) on-line preconcentration and determination with high performance flow flame emission spectrometry in natural samples

“…Although chromium speciation by on-line preconcentration methods are reported for Cr(VI) [4][5][6][7], only a few methods were published for preconcentration and direct determination of Cr(III) [8,9]. That is the reason why a new Cr(III) preconcentrating method is also introduced.…”

“…For chromium speciation one of the most effective techniques used is the on-line combination of HPLC separation and element selective detection with atomic spectrometry [2][3][4]. The main problem with these methods is that the normal concentration range of chromium in natural samples (e.g.…”

“…The conversion of toxic Cr(VI) to Cr(III) is a studied phenomenon in surface waters [3,10,11]. To minimize the rate of this conversion after sampling, the filtered water samples were not acidified.…”

Cr(III) and Cr(VI) On-Line Preconcentration and High-Performance Flow Flame Emission Spectrometric Determination in Water Samples

“…Earlier several methods for the preconcentration of Cr(VI) were developed (3)(4)(5)(6). However, in the literature there is no effective and easy to install method for the preconcentration of Cr(III).…”

Synthesis, Structures and Recognition Properties of Two Cadmium(II) Phosphonates for Highly Selective Sensing of Cr2O72− and CrO42− Anions

“…Compound 2 was assembled through p À p stacking and hydrogen bonding interactions to form a 1D supramolecular structure. Furthermore, both compounds exhibited remarkable luminescent properties, and could be applied as the high selective and sensitive luminescent sensors in the sensing of Cr 2 O 7 2 À and CrO 4 2 À anions through the luminescence quenching effect with a lowdetection limit of 3.5 3 10 À 7 M and 4.6 3 10 À 7 M (for 1) and 6.1…”