Reduction of interference effects in flame atomic absorption spectrometry using flow injection techniques

Abstract

Nylon membrane, 0.45-pm pore. 24 m m f.d.(3) Stainless steel disc. 2 Iun pore. 5 mm f.d.

Atomic spectrometric detectors for flow-injection analysis

“…For copper the reagent was dithiooxamide with dissolution in a solution of potassium dichromate in nitric acid. Both stainless-steel [90,92,93] and disposable nylon membrane filters [94] have been used. An interest ing feature of this approach is that other matrix components, which could compete with analyte species for binding sites on a solid extractant, may help improve precipitation collection efficiencies by means of coprecipitation.…”

“…Precipitation has also been used to remove the interference of aluminum in the determination of calcium [94,95] by precipitation of the calcium with basic ammonium oxalate. This reaction has also been used as the basis of an indirect method for oxalate [90].…”

On-line filtration system for determining total chromium and chromium in the soluble fraction of industrial effluents by flow injection flame atomic absorption spectrometry

“…The literature contains several references to the determination of chromium by flow-injection flame atomic absorption spectrometry [24,25,26,27,28], but no satisfactory procedure has been reported for the determination of chromium using the coupling (FI-FAAS) and including a filtration system. Adeeyinwo and Tyson [29] used membrane filters for online precipitate collection and dissolution with only limited success. When they used a graded collection system composed of a combination of a packed-bed filter and a membrane filter [30], the system showed much better performance than a membrane filter used alone.…”

Desenvolvimento de fases estacionarias para cromatografia liquida de alta eficiencia em fase reversa a partir da adsorção e imobilização do poli(metiltetradecilsiloxano) sobre silica metalizada

“…Ele foi usado principalmente na separação de compostos de estruturas similares, incluindo estereoisômeros 52 , derivados da anilina 53 e diversas drogas 54 . Quando comparados com fases comerciais de sílica-C18, os suportes de carbono grafitizado apresentaram boa estabilidade até pH 12 e em temperaturas mais elevadas 55,56 . Porém, as fases baseadas em carbono apresentam baixa capacidade de aceitação de amostras e desempenho cromatográfico bastante limitado 57 .…”