Tube-flame Atomic Absorption Spectrophotometry Research Articles

A Simple and Green Vortex-Assisted Switchable Solvent-Based Microextraction Method by Using Schiff Base Ligand Complexation for Iron Determination in Mineral Spring Water Samples Prior to Slotted Quartz Tube Flame Atomic Absorption Spectrophotometry

In this study, a vortex-assisted switchable solvent microextraction (VA-SSME) method was developed for the determination of iron by slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS). A ligand synthesized from the reaction of ortho-phenylenediamine and 5-bromosalicylaldehyde was used to form a coordinate complex of iron. All experimental variables such as switchable solvent amount, sodium hydroxide concentration, sodium hydroxide amount, and diluent amount were optimized to increase extraction efficiency for the iron complex. Optimum conditions were applied to aqueous standard solutions in the range of 20–750 ng/mL, and the percent relative standard deviation (%RSD) was less than 2.0%. The limit of detection (LOD) and limit of quantification (LOQ) were determined as 4.8 and 16.2 ng/mL, respectively. The optimized method recorded approximately 53 times enhancement according to the conventional FAAS system. The proposed method was applied to mineral spring water samples, and satisfactory percent recovery results (100–105%) were obtained for iron, indicating good applicability in addition to high accuracy.

Chitosan magnetic hydrogel based ligandless magnetic solid phase extraction for the accurate and sensitive determination of thallium by slotted-quartz tube flame atomic absorption spectrophotometry with matrix matching calibration strategy

In this study, a promising method was developed for the determination of thallium at trace levels by applying chitosan based magnetic solid phase extraction using slotted quartz tube atomic absorption spectrometry. Chitosan based magnetic hydrogels (CMH) were synthesized and used as solid phase extraction sorbents. The variable parameters required for the extraction method such as hydrogel amount, adsorption period and eluent volume were optimized, and under the optimized conditions, limits of detection and quantification values were recorded as 12 and 39 ng/mL, respectively. Real sample applications were performed to test the accuracy of the proposed method. For this purpose, recovery studies were carried out in two different spiking concentrations of thallium in lake water, well water and wastewater samples using the developed extraction/preconcentration method (chitosan magnetic hydrogel based ligandless magnetic solid phase extraction, CMH-LMSPE). The obtained percent recovery values of 87.2–113.2% confirmed the applicability of the method with high accuracy and precision.

A sensitive and accurate analytical method for the determination of cadmium in food samples: Molybdenum coated T-shape slotted quartz tube flame atomic absorption spectrophotometry

In this study, a molybdenum coated T-shaped slotted quartz tube atom trap flame atomic absorption spectrophotometry method (Mo coated-T-SQT-AT-FAAS) was developed for the determination of cadmium with on-line preconcentration. Inner surface of T-SQT was coated with molybdenum to enhance the trapping efficiency. Hydrogen gas was used instead of organic solvents to release trapped atoms. Limit of detection and quantification were found to be 0.057 and 0.082 µg/L, respectively. The developed method has a linear working range between 0.10 and 1.0 µg/L with a low %RSD value (<3.7). About 1202 times enhancement in detection power was recorded over the conventional FAAS system. Recovery experiments were used to determine the applicability of the method developed to real samples (linden, milk powder and mint) and significant results (94.4–100.7%) were obtained for the samples spiked at 0.30, 0.50 and 1.0 µg/L. The method was also applied to Tomato Leaves 1573a SRM to check the accuracy.

Ultra-trace cadmium determination in eucalyptus and rosemary tea samples using a novel method: deep eutectic solvent based magnetic nanofluid liquid phase microextraction-slotted quartz tube-flame atomic absorption spectrometry

A deep eutectic solvent-based magnetic nanofluid liquid phase microextraction method was developed for the preconcentration of cadmium prior to its determination using the slotted quartz tube flame atomic absorption spectrophotometry system.

Combination of stearic acid coated magnetic nanoparticle based sonication assisted dispersive solid phase extraction and slotted quartz tube-flame atomic absorption spectrophotometry for the accurate and sensitive determination of lead in red pepper samples and assessment of green profile

This study describes the determination of lead at trace levels by slotted quartz tube flame atomic absorption spectrophotometry (SQT-FAAS) after preconcentration by the help of stearic acid coated magnetic nanoparticle (SAC-MNPs) based sonication assisted dispersive solid phase extraction (SA-DSPE). SAC-MNPs were used due to their easy separation advantages by the application of external magnetic field. All extraction parameters were optimized by response surface methodology based experimental design. The experimented data was evaluated by the analysis of variance. Under the optimum conditions, about 31 folds enhancement in detection power was obtained over the conventional FAAS. The recovery results obtained for samples spiked at 60 and 120 ng mL−1 were 106.6 and 102.6%, respectively, validating the method as accurate and applicable to the red pepper matrix. The percent relative standard deviations of the results were under 5.0% even at low concentrations that established high precision for replicate extractions and instrumental readings.