University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Spectrometry

Classification: Spectrometry -> thermal lens

Citations 6

"Thermo-optical Flow Injection Determination For Hydrogen Peroxide Based On An Enzymic Reaction Heat-induced Optical Beam Deflection"
Anal. Chim. Acta 1995 Volume 299, Issue 3 Pages 333-336

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Xing-Zheng Wu*, Hiroaki Shindoh and Toshiyuki Hobo

Abstract: A reaction cell was fabricated from a 6 mm i.d. glass tube having a thin Au film carrying immobilized catalase mounted at one end. The cell was immersed in a CCl4 phase, having a water phase above to prevent evaporation, and a probe beam from a He-Ne laser at 632.8 nm was passed 1 mm from the Au film. Sodium phosphate buffer (0.01M) of pH 7.4 was pumped through the cell at 1.6 ml/min and H2O2 solution was introduced using a 40 µL injector. The heat of the decomposition reaction catalyzed by the enzyme induced a deflection in the probe beam which was measured by a knife-edge and a photodiode detection system. The immobilization of catalase by crosslinking with BSA was optimized to obtain a maximum deflection signal. This signal was linear over the concentration range 0.025-0.5 M of peroxide and the detection limit was 0.025M. The RSD for 0.5 M H2O2 solution (n = 20) was 0.93% and the enzyme activity was stable for at least two weeks.
Hydrogen peroxide Apparatus Immobilized enzyme Catalysis Photodiode

"Principles And Analytical Applications Of Acoustooptic Tunable Filters, An Overview"
Talanta 1997 Volume 45, Issue 2 Pages 237-248

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Chieu D. Tran

Abstract: Advantages of acousto-optic tunable filters have been exploited to develop novel analytical instruments which are not feasible otherwise. The instrumentation development and unique features of such AOTF based instruments including the multidimensional fluorimeter, the multiwavelength thermal lens spectrometer, the near-infrared spectrometer based on erbium doped fiber amplifier (EDFA), and detectors for high performance liquid chromatography (HPLC) and flow injection analysis (FIA), will be described. (C) 1997 Elsevier Science B.V. 32 References
Acousto optic tunable filter Instrumentation Review

"Single-laser/crossed-beam Thermal Lens Detection For Short Path Length Samples And Flow Injection Analysis"
Anal. Chem. 1984 Volume 56, Issue 14 Pages 3002-3004

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Yen Yang and Robin E. Hairrell

Abstract: The optical configuration described previously (Ibid., 1984, 56, 2336) is potentially useful for detection in liquid chromatography as well as for the cited applications. A 4-mW randomly polarized beam at 632.8 nm from a He - Ne laser is split by a polarizing beam splitter (Oriel model 2630) into a 2-mW pump beam, which is modulated, usually at 70 Hz, and a probe beam, which remains unchopped. Both beams are focused, and crossed at the centre of a 0.1-cm-pathlength flow-cell; under these conditions, the entire length of the thermal lens created by the pump radiation inside the cell defocuses the probe beam. The system has been used to detect bromophenol blue in a flow injection stream of ethanol. Its advantages over other configurations are discussed.
Bromophenol blue Apparatus Detector Laser

"Double-beam Thermal Lens Spectrometry"
Anal. Chem. 1985 Volume 57, Issue 13 Pages 2434-2436

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K. L. Jansen and J. M. Harris

Abstract: The construction of a double-beam configuration for thermal-lens absorption measurements is reported, in which a single laser beam is split into two, only one beam being passed through the sample. Continuous modulation and lock-in amplification of the signal produced by subtraction of the beam intensities allow application of the system to real-time monitoring, such as flow injection analysis or HPLC. Double-beam thermal-lens detection was evaluated for the flow injection analysis of trace levels of iodine in CCl4.
Iodine Organic compound Apparatus Detector Organic phase detection

"Several Factors Affecting The Detection Sensitivity Of The Reaction Heat-induced Optical Beam Deflection Method"
Bull. Chem. Soc. Jpn. 1996 Volume 69, Issue 12 Pages 3423-3428

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Xing-Zheng Wu*, Hideki Kitatani, Katsumi Uchiyama, and Toshiyuki Hobo

Abstract: In order to improve the detection sensitivity of the reaction heat-induced optical beam deflection method, the experimental factors that affect the detection sensitivity were investigated in detail. Firstly, different types of deflection detectors were compared. The experimental results showed that the bi-cell photodiode detector is most sensitive to the deflection signal. Secondly, the effect of the size of the reaction cell on the detection sensitivity was investigated. A small reaction cell gave a stable baseline and small noise in flow injection experiments, and thus gave a high detection sensitivity. Thirdly, the effects of the optical arrangements on the detection sensitivity were investigated. Focusing the probe beam close to the gold film/CCl4 interface enhanced the detection sensitivity. Also, refocusing the deflected probe beam improved the sensitivity. Under the selected experimental conditions, the detection of the neutralization reaction between HCl and NaOH at sub-nanomol level became possible. Further improvements are also discussed. 26 References
Hydrochloric acid Sodium hydroxide Flowcell Optimization Photodiode

"New Analytical Methods For Phosphorus"
Mizu Shori Gijutsu 1982 Volume 23, Issue 12 Pages 1063-1067

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Odashima, T.

Abstract: A review with 19 references of the new analytical methods for P such as flow injection analysis, thermal lens absorption analysis, and stripping voltammetry. (SFS)
Phosphorus Review