In situ solvent formation microextraction based on ionic liquids and 1-(2-hydroxynaphtalene-1-yl)ethane oxime for determination of zinc

Abstract

Um método simples de microextração com formação de solvente in situ (ISFME) baseado no uso de líquido iônico (IL) como solvente extrator e hexafluorofosfato de sódio (NaPF 6) como agente par-iônico foi proposto para a concentração de níveis de traço de zinco. Neste método, o íon zinco foi complexado com 1-(2-hidroxinaftaleno-1-il)etano oxime (HNEO) e extraído em uma fase líquida iônica. Após a separação, o analito enriquecido na fase final foi determinado por espectrometria de absorção atômica de chama (FAAS). ISFME é um método rápido, simples e adequado para extração e concentração de inorgânicos tais como íons metálicos em soluções contendo uma elevada concentração de sal. As influências dos parâmetros analíticos na eficiência da microextração foram investigadas e otimizadas. Sob condições otimizadas, o limite de detecção e o fator de enriquecimento foram 0,05 µg L-1 and 81, respectivamente. O desvio padrão relativo (R.S.D.) obtido foi 0,8%. A exatidão do método foi confirmada pela análise de materiais de referência certificados. O método apresentado foi aplicado com êxito na determinação de zinco em amostras de zinco. A simple in situ solvent formation microextraction (ISFME) method based on use of ionic liquid (IL) as extractant solvent and sodium hexafluorophosphate (NaPF 6) as ion-pairing agent was proposed for the concentration of trace levels of zinc. In this method, zinc ion was complexed with 1-(2-hydroxynaphtalene-1-yl)ethane oxime (HNEO) and extracted into an ionic liquid phase. After phase separation, the enriched analyte in the final solution was determined by flame atomic absorption spectrometry (FAAS). ISFME is a fast, simple and suitable method for extraction and concentration of inorganic such as metal ions from sample solutions containing a high concentration of salts. The influences of the analytical parameters on the microextraction efficiency were investigated and optimized. Under the optimum conditions, the limit of detection and the enhancement factor were 0.05 µg L-1 and 81, respectively. The relative standard deviation (R.S.D.) was obtained 0.8%. The accuracy of the method was confirmed by analyzing certified reference materials. The presented method was successfully applied for the determination of zinc in water samples.

2-Hydroxyethylammonium Bisulfate (2-HEAS) as a Brønsted Acidic Ionic Liquid Catalyst for Esterification

“…They are liquid at a temperature of 100 °C or less. ILs have unique physical and chemical properties and are widely regarded in the materials and chemical sciences. , To evaluate the application of IL in several fields such as gas absorption and separation, as an electrolyte in solar cells, as organic transformations, as lubricating additives, as a solvent, and as a mold for the dispersion and synthesis of nanoparticles and liquid–liquid extraction, ILs have been tested depending on the nature of the constituent ions. ILs contain organic cations such as conventional aromatic rings and various aliphatic chains on ammonium ions .…”

Use of Ionic Liquids for Trace Analysis of Methyl Tert-Butyl Ether in Water Samples using in situ Solvent Formation Microextraction Technique and Determination by GC/FID

“…Properties and some practical advantages for this method have been already reported in the literatures (12)(13)(14). In situ solvent formation microextraction (ISFME) was proposed by authors in 2009, which is based on ionic liquids for the extraction of analytes (15).…”