Variations of thermal-lens spectrophotoetry with helium-cadmium laser excitation for the determination of traces of phosphorus

Thermal lens spectrometry. A review

“…No significant variation for the value of tc, the characteristic time constant of the system, was noted: They concluded that in these situations where the interfering matrix cannot be precisely compensated for or effectively separated from the analyte species, TLS analysis requires preparation of a calibration graph in a matrix approximating the environmental sample. Grishko et al , 49 compared single-beam, differential singlebeam, and dual-beam thermal lens measurements for the determination of phosphorus. The phosphorus is determined as the molybdophosphate-auramine ion pair that is extracted into 2-methylpropan-1-01-hexane (1 + 2).…”

Mode-Mismatched Dual-Beam Differential Thermal Lensing with Optical Scheme Design Optimized Using Expert Estimation for Analytical Measurements

“…1,[11][12][13][14] Of special interest are differential thermal-lens measurements, as they could provide a significant increase in the sensitivity against light-absorbing backgrounds. [15][16][17][18][19][20][21][22][23][24][25][26] All the investigations in this area can be divided into three main directions: (1) singlelaser differential measurements, 15,17,19 which have given the impact to this direction, (2) various technically advanced schematics, 16,18,[21][22][23] and (3) most frequently used photothermal spectroscopy dual-beam collinear schemes. 20,24,26 Single-channel schemes showed the possibility of differential thermal lensing but proved to be not very sensitive overall.…”

“…Due to the specifics of highly sensitive photothermal spectroscopy, it is mostly used for the first case. 16,17,20,24,25 However, due to recent advances of photothermal spectroscopy into microfluidics and biomedical research, the testing of differential thermal-lens schematics over high (in absolute absorbance value) background seems topical.…”