Abstract
A simple, fast, reproducible and sensitive method for the flotation- spectrophotometric determination of Al3+is reported. The apparent molar absorptivity (ε) of the ion associate was determined to be 8.35×104L mol-1cm-1. The calibration curve was linear in the concentration range of 1.0-50 ng mL-1of Al3+with a correlation coefficient of 0.9997. The limit of detection (LOD) was 0.621 ng mL. The relative standard deviation (RSD) at 10 and 30 ng mL-1of aluminium were 1.580 and 2.410% (n=7) respectively. The method was applied for measuring the amount of aluminium in water samples.
Highlights
Aluminium has long been considered as virtually non-toxic and non-absorbable from the gastrointestinal tract
Aluminium at trace and sub-trace levels in the water used for dialysis can cause brain damage, bone disease and anaemia[5]
The preliminary investigation indicated that interaction of Al3+ with XO and CTAB can form a solid ion associate which is insoluble in aqueous and highly nonpolar organic phases, but soluble in some polar organic solvent such as methanol
Summary
Aluminium has long been considered as virtually non-toxic and non-absorbable from the gastrointestinal tract. When quaternary ammonium containing compounds are used, the primary complex produced is a cation, possessing the same charge as that of a metal Such complexes were made to associate with anionic dyes in order to be extractable from aqueous solutions[6]. It should be mentioned that the term “flotationspectrophotometric” is based on the fact that some ion associations are not soluble in polar organic solvents Once both phases have been separated the precipitate is dissolved in an appropriate solvent and the corresponding measurements have been made by spectrophotometric methods[8,9]. Stock solution of CTAB (1×10-3 mol L-1) was prepared by dissolving 0.0364 g of CTAB (Merck) in distilled water and diluting to 100 mL in a flask. Different concentrations of hydrochloric acid and sodium hydroxide in the concentration range of 0.001-0.100 mol L-1
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