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Fresenius' Journal of Analytical Chemistry

, Volume 343, Issue 6, pp 513–517 | Cite as

Comparison of collinear and transverse photothermal deflection spectroscopy for trace analysis of pesticides in water

  • B. Bohnert
  • W. Faubel
  • H. J. Ache
Original Papers Environmental Analysis

Summary

A fiber optic modified photothermal deflection spectrometer (PTDS) was developed and tested for trace analysis of pesticides in water. A UV argon laser beam (λ=363.8 nm) was delivered to a sample cuvette either directly, or through a multimode optical fiber of 400 μm core diameter. The HeNe-probe laser beam was guided to the same sample cuvette by a monomode optical fiber of 5 μm core diameter and focussed not only transverse within an angle of 90°, but also collinear within an angle of approximately 0° to the Ar+-excitation beam. In transverse dual beam experiments a limit of detection (LOD) of 400 ppt for the pesticide DNOC (4,6-dinitroorthocresol) was achieved. The LODs for 2,4-dinitrophenol, dinoseb and dinosebacetate were 2 ppb, 18 pbb and 6 ppb, respectively. These LODs obtained with the transverse PTDS are up to 2 orders of magnitudes lower than the values taken with the Cary 2400 spectrophotometer. In collinear PTDS experiments with the pesticide dinosebacetate the enhancement factor of the LOD is about 4, when compared to the transverse PTDS using 1×1 cm2 diameter sample cuvettes.

Keywords

Optical Fiber Enhancement Factor Trace Analysis Excitation Beam Diameter Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Spear JD, Russo RE, Silva RJ (1988) Appl Spectrosc 42:1103–1105Google Scholar
  2. 2.
    Bohnert B, Faubel W, Ache HJ (1990) Fresenius J Anal Chem 338:695–698Google Scholar
  3. 3.
    Moulin C, Delorme N, Berthoud T, Mauchien P (1988) Radiochim Acta 44/45:103–106Google Scholar
  4. 4.
    Wu S, Dovichi NJ (1990) J Appl Phys 67:1170–1182Google Scholar
  5. 5.
    Holter A, Perkampus HH (1989) Fresenius Z Anal Chem 333:629–633Google Scholar
  6. 6.
    Klenze R, Kim JI, Wimmer H (1991) Radiochim Acta 52/53: 97–101Google Scholar
  7. 7.
    Adelhelm K, Faubel W, Ache HJ (1990) Fresenius J Anal Chem 338:259–264Google Scholar
  8. 8.
    Okajimo S, Reed T, Beitz JV, Sabau CA, Bowers DL (1991) Radiochim Acta 52/53:111–117Google Scholar
  9. 9.
    Cross JE, Crossly D, Liezers M, McMillan JW, Pollard PM, Turner S (1990) Photoacoustic and photothermal phenomena. Murphy J, Maclachlan Spicer JW, Aamodt LC, Royce BSH (eds), Optical Sciences, vol 62:413–415. Springer, BerlinGoogle Scholar
  10. 10.
    Russo RE, Rojas D, Robouch P, Silva RJ (1990) Rev Sci Instr 61:3729–3732Google Scholar
  11. 11.
    Tam AC (1986) Rev Modern Phys 58:361–431Google Scholar
  12. 12.
    Coufal H (1990) Fresenius J Anal Chem 337:835–842Google Scholar
  13. 13.
    Bialkowski SE (1986) Spectroscopy 1:26–48Google Scholar
  14. 14.
    Aamodt LC, Murphy JC (1983) J Appl Phys 54:581–591Google Scholar
  15. 15.
    Buerck J, Faubel W, Gantner E, Hoeppener-Kramar U, Ache HJ (1990) Proc 3rd Int KfK/TNO Conf on Contaminated Soils, Karlsruhe, Germany, Vol. I: 775–782, eds. Arendt F, Hinsenwald M, van den Brink WJ, Kluwer Academic PressGoogle Scholar
  16. 16.
    Spear JD, Russo RE, Silva RJ (1990) Appl Optics 29:4225–4234Google Scholar
  17. 17.
    Nakanishi K, Imasaka T, Ishibashi N (1987) Anal Chem 59:1550–1554Google Scholar
  18. 18.
    Imasaka T, Nakanishi K, Ishibashi N (1987) Anal Chem 59:1554–1557Google Scholar
  19. 19.
    Rojas D, Silva RJ, Spear JD, Russo RE (1991) Anal Chem 63:1927–1932Google Scholar
  20. 20.
    Berthoud T, Delorme N (1987) Appl Spectrosc 41:15–19Google Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • B. Bohnert
    • 1
  • W. Faubel
    • 1
  • H. J. Ache
    • 1
  1. 1.Institut für RadiochemieKernforschungszentrum Karlsruhe GmbHKarlsruheFederal Republic of Germany

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