|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5130783||1490856||2017||7 صفحه PDF||سفارش دهید||دانلود رایگان|
- A miniature DBD-OES detection approach is firstly integrated in a LOV platform.
- It could readily achieve sample pretreatment, derivatization, nebulization and OES detection.
- It provides a technique for the detection of cadmium at a sub Î¼g Lâ1 level.
- It is especially suitable for field analysis by virtue of small size.
A miniature optical emission spectrometric (OES) system is developed by incorporating dielectric barrier discharge (DBD) microplasma as excitation source in a lab-on-valve (LOV) configuration for trace cadmium analysis. The entire system integrates bead injection (BI) sample pretreatment, post-column derivatization, in-situ nebulization and OES detection. Trace cadmium in sample solution is separated and preconcentrated by flowing through a 2-(5-Br-2-pyridylazo)-5-dethylaminophenol (5-Br-PADAP) loaded microcolumn in LOV, followed by elution with 20Â Î¼L of 0.1Â M hydrochloric acid. The eluate after online derivatization with 5Â Î¼L of 0.2Â M borate buffer solution containing 7.5% (v/v) ethanol is immediately transported into a pneumatic micronebulizer integrating DBD microplasma for cadmium excitation, and OES is recorded by using a charge coupled device (CCD) spectrometer. As a miniaturized analytical set-up, LOV provides an ideal sample-processing front-end with detection by DBD-OES, while introduction of DBD excitation source in LOV highly improves the analytical performances for trace metal species. With a sample volume of 1.0Â mL, a detection limit of 0.06Â Î¼gÂ Lâ1 and a linear range of 0.2-50Â Î¼gÂ Lâ1 are achieved for cadmium, along with an enrichment factor of 38. The accuracy of the present system is confirmed by the determination of cadmium in certified reference materials, and further demonstrated by spiking recoveries of cadmium in real water samples.
A miniature optical emission spectrometric (OES) system was developed by incorporating dielectric barrier discharge (DBD) microplasma as excitation source in a lab-on-valve (LOV) configuration for trace cadmium analysis.173
Journal: Analytica Chimica Acta - Volume 976, 11 July 2017, Pages 45-51