دورية أكاديمية
Aerosol-Phase Extraction Method for Determination of Ca, K, Mg, and Na in Biodiesel through Inductively Coupled Plasma Optical Emission Spectrometry
| العنوان: | Aerosol-Phase Extraction Method for Determination of Ca, K, Mg, and Na in Biodiesel through Inductively Coupled Plasma Optical Emission Spectrometry |
|---|---|
| المؤلفون: | Sánchez, Raquel, Maestre, Salvador E., Prats Moya, Soledad, Todolí Torró, José Luis |
| المساهمون: | Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología, Análisis de Polímeros y Nanomateriales, Análisis de Alimentos y Nutrición |
| بيانات النشر: | American Chemical Society |
| سنة النشر: | 2017 |
| المجموعة: | RUA - Repositorio Institucional de la Universidad de Alicante |
| مصطلحات موضوعية: | ICP-OES, Liquid – liquid Extraction, Aerosol phase extraction, Metals, Biodiesel, Química Analítica, Nutrición y Bromatología |
| الوصف: | A novel extraction method was developed, optimized, and validated for the elemental analysis of organic samples. The method, called aerosol-phase extraction (APE), is based on nebulization of the extracting aqueous solution (0.1 mol·L–1 nitric acid) on the sample. Extraction was performed at the interface of generated extractant droplets as they entered into contact with the samples. Afterward, the phases were allowed to separate and Ca, K, Na, and Mg were determined in aqueous phase by means of inductively coupled plasma optical emission spectroscopy (ICP-OES). Measurement of aerosol characteristics demonstrated that a water-in-oil emulsion was generated. Therefore, once the aqueous solution was dispersed into the sample, the phases spontaneously separated. Furthermore, the interfacial specific surface area exhibited values on the order of 1 m2·mL–1, hence enhancing the extraction kinetics over conventional extraction methods. Key variables affecting the extraction yield were the nebulization gas flow rate, liquid flow rate, extraction time, acid concentration, nebulizer tip to sample surface gap, and morg/maq ratio. Once the optimal conditions were selected, the method was applied and validated for the determination of Ca, K, Na, and Mg by ICP-OES in 0.5 mL biodiesel samples with an expanded uncertainty lower than 2%. With the APE method, the extraction time was around 1 min, whereas conventional methods employed to perform this kind of extraction required from 4 to 50 min. Additionally, the APE involved preconcentration of analytes, thus lowering the limit of detection (LOD) to the nanograms per milliliter level (i.e., LODs based on the 3sb criterion were 32, 20, 19, and 24 ng·mL–1 for Ca, K, Na, and Mg, respectively). Furthermore, accuracy of quantification of Ca, K, Na, and Mg concentration by APE was not significantly different as compared to that afforded by conventional liquid–liquid extraction. Finally, Ca, K, Na, and Mg contents were determined in four real samples in the 0.5–13 mg·kg–1 range. The ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | http://dx.doi.org/10.1021/acs.analchem.7b04205Test; Analytical Chemistry. 2017, 89(24): 13618-13625. doi:10.1021/acs.analchem.7b04205; 0003-2700 (Print); 1520-6882 (Online); http://hdl.handle.net/10045/72546Test |
| DOI: | 10.1021/acs.analchem.7b04205 |
| الإتاحة: | https://doi.org/10.1021/acs.analchem.7b04205Test http://hdl.handle.net/10045/72546Test |
| حقوق: | © 2017 American Chemical Society ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.8D91E2BD |
| قاعدة البيانات: | BASE |
| DOI: | 10.1021/acs.analchem.7b04205 |
|---|