Extraction-atomic-absorption spectrophotometric determination of antimony by generation of its hydride in non-aqueous media

Abstract

A method for covalent hydride generation in a non-aqueous extraction phase is proposed. The hydride generation is carried out in an aliquot of metalcomplex extraction solution by sodium tetrahydroborate(ll1) in N,N-dimethylformamide solution and anhydrous acetic acid. The proposed method gives improved sensitivity, eliminates interferences and enables hydride generation of difficult elements to be carried out. Antimony is extracted by ammonium pyrrolidine-I -carbodithioate into chloroform and after hydride generation by the proposed method, it is determined by flame AAS. The method is applied to the determination of antimony in BCS standard steels with good accuracy and precision.

Ferrous analysis

“…Extractive separation of Sb with TOPO/i-BuCOMe was combined with pulsed introduction into an air-acetylene flame for the determination of PPM in steels (204), while extraction with ammonium pyrrolidine-l-carbodithioate into chloroform and subsequent hydride generation from this matrix for a final atomic absorption determination has also been reported (25).…”

“…Other spectral methods reviewed were electron microprobe (31,152) and Auger spectroscopy (65,170,176,243,338). Several of these reviews described surface analysis techniques (25,31,60,117,122,125,170,243,245,338,444,482,560).…”

“…New co-oximeters (23) use five or more wavelengths to resolve and quantitate hemoglobin fractions and thereby accurately compute oxygen saturation of arterial blood. Polychromatic analysis continues to be a useful technique for improving the accuracy of other clinical assays (24,25), including some reflectance applications…”

Influence of experimental parameters on the determination of antimony in seawater by atomic absorption spectrometry using a transversely heated graphite furnace with Zeeman-effect background correction

“…Added to these phenomena, important problems of bending of analytical calibration curves of Sb have also been noted previously [20,21]. In these studies, deuterium background correction [22,23,24] or no background correction [25] and peak height measurements have been used. Added to the variety of the systems, very different experimental settings, like a 3.3 nm [23], a 0.7 nm [24] or a 0.2 nm [22] spectral bandwidth coupled to a hollow cathode [24,26] or an electrodeless discharge [22,23] lamp have been also used.…”