Selective determination of Sm (III) in lanthanide mixtures by thermal lens microscopy

Abstract

Since lanthanides are inner transitional elements with their 4f and 5d energy levels closed, they possess narrow electronic absorption peaks, which are little affected by their chemical environment. In this research, a thermal lens microscope (TLM) that utilizing diode lasers as pump and probe beams was constructed for selective determination of Sm (III) without any pre-concentration and separation procedure. The calibration plot has a linear behavior over the 0.5-500 µgmL-1 range and a limit of detection (LOD) of 0.08 µg mL-1. The relative standard deviation (RSD) is smaller than 5%. This method can be potentially applicable to environmental studies.

Design optimization of microfluidic-based solvent extraction systems for radionuclides detection

“…As a case study, we consider the detection of trivalent neodymium (Nd(III)) and trivalent samarium (Sm(III)) in organic and aqueous solutions, respectively. Detection using TLM is appropriate for this case, because lanthanides exhibit narrow adsorption bands [31]. In particular, since the absorbance at the maximum absorption wavelength is different for Nd(III) and Sm(III), excitation laser beams having different wavelength can be applied for TLM detection.…”

“…For the µTAS system using TLM for the detection of the individual radionuclides, the limit of detection for Nd(III) and Sm(III), under the conditions considered, could range from 10 −4 M to 10 −5 M. The LOD of Nd(III) and Sm(III), based on their absorption spectrum [31], are assumed to be LOD Nd = 10 −4 M and LOD Sm = 10 −5 M, respectively [24]. The distribution coefficients of Nd(III) and Sm(III) in the extraction and scrubbing steps for those conditions are α N d = 3.7 and α Sm = 0.3 [34].…”

Femtoliter Scale Detection of an Antithyroid Drug Using Gold Nanoparticles in a Microfluidic Chip

“…The advantages of this technique are not only limited to its high-sensitivity but also comprise other unique specifications like ability of low sample volume measurement and dependency on the thermo optical behavior of solvents. 5,6 Photo thermal lens microscopy (PTLM) is a sort of photo thermal spectrometry in which a microscope is used to introduce the lights to the sample. This makes it ideal for low detection volume measurements in a microchannel.…”

An Optical Configuration of Crossed-Beam Photothermal Lens Spectrometer Operating at High Flow Velocities and Its Application for Cysteine Determination in Human Serum and Saliva

“…Principally, all substances which absorb the light, even fluorescent compounds, except in the cases that the quantum yield equals unity, can be analyzed and detected by TLS. − In addition to their high sensitivity, which is comparable to fluorescence spectrometers, photothermal lens spectrometric methods can be applied for the analysis of a much larger range of analytes . Hence, several optical configurations and instrumentations of TLS are introduced, ,− which generally consist of single beam and dual beam (collinear and crossed-beam) configurations. , Collinear and crossed-beam TLS (CBTLS) configurations are based on the transversal and coaxial flow modes. Here, collinear and crossed-beam refer to the optical configurations of the probe and excitation beams while the transversal and coaxial expressions describe the angle between the propagation trajectory of the excitation beam and flow direction of the sample.…”

“…10 Hence, several optical configurations and instrumentations of TLS are introduced, 4,11−13 which generally consist of single beam and dual beam (collinear and crossed-beam) configurations. 7,14 Collinear and crossed-beam TLS (CBTLS) configurations are based on the transversal and coaxial flow modes. Here, collinear and crossed-beam refer to the optical configurations of the probe and excitation beams while the transversal and coaxial expressions describe the angle between the propagation trajectory of the excitation beam and flow direction of the sample.…”