Several Factors Affecting the Detection Sensitivity of the Reaction Heat-Induced Optical Beam Deflection Method.

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  • Wu Xing-Zheng
    Departmental of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University
  • Kitatani Hideki
    Departmental of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University
  • Uchiyama Katsumi
    Departmental of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University
  • Hobo Toshiyuki
    Departmental of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University

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  • Several Factors Affecting the Detection

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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.

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