Flow injection manifolds with membrane filters for pre-concentration and interference removal by precipitation flow injection flame atomic absorption spectrometry
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چکیده
منابع مشابه
Determination of calcium, magnesium and strontium in soils by flow injection flame atomic absorption spectrometry.
Several procedures for the determination of Ca, Mg and Sr in soils have been compared on the basis of the accuracy of analysis of two NIST reference materials (Montana Soils SRM 2710 and SRM 2711). Samples were dissolved in a mixture of hydrofluoric and nitric acids in sealed vessels in a microwave oven and in teflon beakers on a hot plate. The digests obtained from both dissolution methods wer...
متن کاملUse of masking agents in the determination of lead in tap water by flame atomic absorption spectrometry with flow injection pre-concentration.
The selectivity of immobilised 8-hydroxyquinoline for lead is shown to be improved by the use of masking agents during pre-concentration, prior to determination by flame atomic absorption spectrometry. Interference by iron, copper, aluminium and zinc is suppressed by including triethanolamine, thiourea, fluoride, acetylacetone or cyanide in the buffer as masking agents. Species such as iron or ...
متن کاملDesign and operation of an autosampler controlled flow-injection preconcentration system for lead determination by flame atomic absorption spectrometry
Flow-injection manifolds are described which allow the preconcentration of lead for flame atomic absorption determinations, using columns contained within the sample loop of an injection valve. An interface was designed which allowed the valves and pump in the system to be controlled by an autosampler which enabled precise timing of preconcentration and elution steps. The effects of sample flow...
متن کاملCloud Point Extraction of Trace Amounts of Copper and Its Determination by Flow Injection Flame Atomic Absorption Spectrometry
A simple and convenient method based on cloud point extraction was proposed for the determination of copper. The extraction was carried out in the presence of 2-[(2-mercaptophenylimino)methyl]phenol (MPMP) as the chelating ligand and octylphenoxypolyethoxyethanol (Triton X-114) as the non-ionic surfactant. After phase separation, the surfactant rich phase containing the complex was diluted with...
متن کاملDetermination of low selenium concentrations by flow injection hydride generation atomic absorption spectrometry (FI-HG-AAS) - interference by perchloric acid
In routine determinations of selenium (Se) by flow injection hydride generation atomic absorption spectrometry (Fi-HG-AAS) technique a home-made equipment from commercially available components were used. An electrically heated quartz tube was used as atomiser. Blank and Se-standard solutions were analysed after wet digestion using an oxidising acid mixture (HNO3/HClO4). An absorption signal at...
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ژورنال
عنوان ژورنال: The Analyst
سال: 1990
ISSN: 0003-2654,1364-5528
DOI: 10.1039/an9901501543