Utility of solid phase extraction for UV-visible spectrophotometric determination of gallium in environmental and biological samples
| Autor: | Alaa S. Amin, S. M. N. Moalla |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chromatography
010405 organic chemistry Elution General Chemical Engineering 010401 analytical chemistry chemistry.chemical_element General Chemistry Amberlite Molar absorptivity Cetylpyridinium chloride 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Nitric acid Dimethylformamide Solid phase extraction Gallium |
| Zdroj: | RSC Advances. 6:1938-1944 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c5ra21368a |
| Popis: | A sensitive, selective and rapid method for the determination of gallium based on the sensitive reaction of Ga(III) with 1-(2-benzothiazolylazo)-2-hydroxy-3-naphthoic acid (BTAHN) and the solid phase extraction of the BTAHN–Ga(III) complex on a column of Amberlite XAD-4 resin was developed. In the presence of 2.0 mol L−1 of nitric acid solution and cetylpyridinium chloride (CPC) medium, BTAHN reacts with gallium(III) to form a deep red complex with a molar ratio of 2 : 1 {BTAHN to Ga(III)}. The complex was enriched by solid phase extraction with an Amberlite XAD-4 resin. An enrichment factor of 500 was obtained by elution of the complex from the column with a minimal amount of dimethylformamide (DMF). The molar absorptivity of the complex in DMF medium was 5.57 × 107 L mol−1 cm−1 at 599 nm. Beer's law was obeyed in the range of 0.01–0.70 μg mL−1. The relative standard deviation for eleven replicate samples at the 0.50 μg mL−1 level was 0.95%. The attained detection and quantification limits amounted to 3.1 and 10.2 ng mL−1, respectively. This method was applied to the determination of gallium in environmental water and biological samples with good results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|