Atomic Spectrometry Group

Fundamental Studies of GFAAS

  1. Frech W.
    Recent developments in atomizers for electrothermal atomic absorption spectrometry.
    Fresenius J. Anal. Chem. 355 (1996) 475-486.
  2. Berglund M.
    The importance of the rollover absorbance and the Zeeman sensitivity ratio related coefficient for the accuracy in the linearization of calibration curves in electrothermal atomic absorption spectrometry with Zeeman effect background correction.
    Spectrochim. Acta 51B (1996) 429-439.
  3. Hadgu N., Ohlsson K.E.A., Frech W.
    Diffusion vapour transfer modelling for an end-capped atomizer. Part 1. Atomizer with closed injection port.
    Spectrochim. Acta 50B (1995) 1077-1093.
  4. Berglund M., Baxter D.C.
    Test of the generalized standard addition method and linearization algorithms for the direct, simultaneous, multi-element analysis of solid samples by electrothermal atomic absorption spectrometry.
    Mikrochim. Acta 119 (1995) 311-322.
  5. Berglund M.
    Towards multielement electrothermal atomic absorption spectrometry.
    Ph.D. Thesis, Umeň University (1995). ISBN 91-7191-023-9.
  6. Hadgu N., Frech W.,
    Performance of side-heated graphite atomizers in atomic absorption spectrometry using tubes with end caps.
    Spectrochim. Acta 49B (1994) 445-457.
  7. Frech W., L'vov B.V.
    Matrix vapours and physical interference effects in graphite furnace atomic absorption spectrometry - II. Side-heated tubes.
    Spectrochim. Acta 48B (1993) 1371-1379.
  8. L'vov B.V., Frech W.
    Matrix vapours and physical interference effects in graphite furnace atomic absorption spectrometry - I. End-heated tubes.
    Spectrochim. Acta 48B (1993) 425-433.
  9. Ohlsson K.E.A. An atomic and molecular absorption spectrometric study of the atomization chemistry in the graphite tube atomizer.
    Ph.D. Thesis, Umeň University (1993). ISBN 91-7174-740-0.
  10. Ohlsson K.E.A., Cedergren A., Frech W.
    AlH spike formation in a graphite atomizer.
    Spectrochim. Acta 47B (1993) 1525-1533.
  11. Iwamoto E., Ohlsson K.E.A., Baxter D.C., Frech W.
    Spatially resolved spectroscopic measurements of CN, C2 and Al in graphite tube electrothermal atomizers under various operating conditions.
    J. Anal. At. Spectrom. 7 (1992) 1063-1068.
  12. Ohlsson K.E.A., Iwamoto E., Frech W., Cedergren A.
    Transfer of aluminium compounds and spike atomization in spatially isothermal graphite atomizer.
    Spectrochim. Acta 47B (1992) 1341-1352.
  13. Frech W., L'vov B.V., Romanova N.P.
    Condensation of matrix vapours in the gaseous phase in graphite furnace atomic absorption spectrometry.
    Spectrochim. Acta 47B (1992) 1461-1469.
  14. Berglund M., Baxter D.C.
    Computer program (CHMASS) for calculating theoretical characteristic mass values in electrothermal atomic absorption spectrometry.
    J. Anal. At. Spectrom. 7 (1992) 461-470.
  15. Ohlsson K.E.A.
    Aluminium atom formation in electrothermal graphite atomizer atomic absorption spectrometry studied by in situ spectroscopic measurements of aluminium and aluminium hydride.
    J. Anal. At. Spectrom. 7 (1992) 357-363.
  16. Frech W., Li K., Berglund M., Baxter D.C.
    Effects of modifier mass and temperature gradients on analyte sensitivity in electrothermal atomic absorption spectrometry.
    J. Anal. At. Spectrom. 7 (1992) 141-145.
  17. Berglund M., Frech W., Baxter D.C.
    Achieving efficient, multi-element atomisation conditions for atomic absorption spectrometry using a platform-equipped, integrated-contact furnace and a palladium modifier.
    Spectrochim. Acta 46B (1991) 1767-1777.
  18. Ohlsson K.E., Frech W.
    Quantitative in situ spectroscopic measurements and thermodynamic equilibria modelling of CN and C2 in a graphite furnace.
    Spectrochim. Acta 46B (1991) 559-581.
  19. Baxter D.C., Frech W.
    On the direct analysis of solid samples by graphite furnace atomic absorption spectrometry.
    Fresenius J. Anal. Chem. 337 (1990) 253-263.
  20. Frech W., Baxter D.C.
    Temperature dependence of atomization efficiencies in graphite furnaces.
    Spectrochim. Acta 45B (1990) 867-886.
  21. Redfield D., Frech W.
    Identification and effect of pre-atomisation losses on the determination of aluminium by graphite furnace atomic absorption spectrometry.
    J. Anal. At. Spectrom. 4 (1989) 685-690.
  22. Frech W., Arshadi M., Baxter D.C.
    Vapour-phase temperature measurements in the evaluation of platform designs for graphite furnace atomic absorption spectrometry.
    J. Anal. At. Spectrom. 4 (1989) 625-629.
  23. Ohlsson K.E.A., Frech W.
    Photographic observation of molecular spectra in inverse Zeeman-effect graphite furnace atomic absorption spectrometry.
    J. Anal. At. Spectrom. 4 (1989) 379-385.
  24. Dedina J., Frech W., Lundberg E., Cedergren A.
    Atomisation of selenium hydride in the graphite furnace.
    J. Anal. At. Spectrom.4 (1989) 143-148.
  25. Wennrich R., Frech W., Lundberg E.
    Spectral interferences in graphite furnace Zeeman effect atomic absorption spectrometry.
    Spectrochim. Acta 44B (1989) 239-246.
  26. Frech W., Baxter D.C., Lundberg E.
    Spatial and temporal non-isothermality as limiting factors for absolute analysis by graphite furnace atomic absorption spectrometry.
    J. Anal. At. Spectrom. 3 (1988) 21-25.
  27. Baxter D.C.
    Advantages of spatially isothermal graphite furnaces for atomic spectrometry.
    Ph.D. Thesis, Umeň University (1988). ISBN 91-7174-319-7.
  28. Baxter D.C., Frech W.
    Temperature gradients as a limiting factor for absolute analysis by graphite furnace atomic absorption spectrometry.
    Spectrochim. Acta 42B (1987) 1005-1010.
  29. Dedina J., Frech W., Cedergren A., Lindberg I., Lundberg E.
    Determination of selenium by graphite furnace atomic absorption spectrometry. Part 2. Role of nickel for analyte stability.
    J. Anal. At. Spectrom. 2 (1987) 435-439.
  30. Dedina J., Frech W., Lindberg I., Lundberg E., Cedergren A.
    Determination of selenium by graphite furnace atomic absorption spectrometry. Part 1. Interaction between selenium and carbon.
    J. Anal. At. Spectrom. 2 (1987) 287-291.
  31. Frech W., Lundberg E., Cedergren A.
    Investigation of interference effects in the presence of sodium and copper chlorides using platform graphite furnace AAS.
    Can. J. Spectrosc. 30 (1986) 123-129.
  32. Cedergren A., Lindberg I., Lundberg E., Baxter D.C., Frech W.
    Investigations of reactions involved in graphite furnace atomic absorption procedures. Part 14. A study of some factors influencing the determination of selenium.
    Anal. Chim. Acta 180 (1986) 373-388.
  33. Frech W., Lindberg A.O., Lundberg E., Cedergren A.
    Atomization mechanisms and gas phase reactions in graphite furnace atomic absorption spectrometry.
    Fresenius Z. Anal. Chem. 323 (1986) 716-725.
  34. Frech W., Lundberg E., Cedergren A.
    Investigations of some methods used to reduce interference effects in graphite furnace atomic absorption spectrometry.
    Prog. Analyt. At. Spectrosc. 8 (1985) 257-370.
  35. Frech W., Lundberg E., Cedergren A.
    Chemische Reaktionen im Graphitrohrofen und deren analytische Bedeutung bei der Atomabsorptionsspektrometrie.
    In Fortschritte in der atomspektrometrischen Spurenanalytik. B. Welz (Ed.) Verlag Chemie, Weinheim, Band 1, pp. 49-72 (1984). (In German)
  36. Cedergren A., Frech W., Lundberg E.
    Estimation of oxygen pressure in graphite furnaces for atomic absorption spectrometry.
    Anal. Chem. 56 (1984) 1382-1387.
  37. Siemer D.D., Lundberg E., Frech W.
    Gas phase temperatures in Massmann furnaces equipped with L'vov platforms.
    Appl. Spectrosc. 38 (1984) 389-391.
  38. Siemer D.D., Frech W.
    Improving the performance of the CRA atomizer by reducing the rate of diffusional atom loss and delaying analyte volatilization.
    Spectrochim. Acta 39B (1984) 261-269.
  39. Zhou N.G., Frech W., de Galan, L.
    On the relationship between heating rate and peak height in electrothermal atomic absorption spectroscopy.
    Spectrochim. Acta 39B (1984) 225-235.
  40. Frech W., Cedergren A., Lundberg E., Siemer D.D.
    Electrothermal atomic absorption spectroscopy - present understanding and future needs.
    Spectrochim. Acta 38B (1983) 1435-1446.
  41. Frech W., Cedergren A., Lundberg E.
    Vapour phase interference effects in electrothermal atomic absorption spectroscopy (AAS).
    In Analytiktreffen, Wissenschaftliche Beitrńge der Karl-Marx-Universit&aumlt, Neubrandenburg (1982).
  42. Persson J-┼.
    An experimental and theoretical investigation of interference effects in electrothermal atomic absorption spectrometry with special emphasis on aluminium, phosphorus and arsenic.
    Ph.D. Thesis, Umeň University (1982). ISBN 91-7174-110-0.
  43. Lundberg E., Bergmark B., Frech W.
    Investigations of reactions involved in electrothermal atomic absorption procedures. Part 11. A theoretical and experimental investigation of factors influencing the determination of tin.
    Anal. Chim. Acta 142 (1982) 129-142.
  44. Frech W., Zhou N.G., Lundberg E.
    A critical study of some methods used to investigate atom formation processes in GFAAS.
    Spectrochim. Acta 37B (1982) 691-702.
  45. Koreckova J., Frech W., Lundberg E., Persson J-┼., Cedergren A.
    Investigations of reactions involved in electrothermal atomic absorption procedures. Part 10. Factors influencing the determination of arsenic.
    Anal. Chim. Acta 130 (1981) 267-280.
  46. Lundberg E., Frech W.
    Influence of instrumental response time on interference effects in graphite furnace atomic absorption spectrometry.
    Anal. Chem. 53 (1981) 1437-1442.
  47. Cedergren A., Frech W., Lundberg E., Persson J-┼.
    Investigations of reactions involved in electrothermal atomic absorption procedures. Part 9. An atomization system with controlled atmosphere and temperature for the determination of volatile elements in complex matrices.
    Anal. Chim. Acta 128 (1981) 1-8.
  48. Frech W., Persson J-┼., Cedergren A.
    Chemical reactions in atom reservoirs used in atomic absorption spectroscopy.
    Prog. Analyt. At. Spectrosc. 3 (1980) 279-297.
  49. Persson J-┼., Frech W.
    Investigations of reactions involved in electrothermal atomic absorption procedures. Part 8. A theoretical and experimental study of factors influencing the determination of phosphorus.
    Anal. Chim. Acta 119 (1980) 75-89.
  50. Frech W., Cedergren A.
    Investigations of reactions involved in flameless atomic absorption procedures. Part 7. Theoretical and experimental study of factors influencing the determination of silicon.
    Anal. Chim. Acta 113 (1980) 227-235.
  51. Frech W.
    The application of high temperature equilibrium calculations for establishing optimum procedures in flameless atomic absorption spectrometry exemplified by determinations of Pb, Sb, Bi and Al in chloride media.
    Ph.D. Thesis, Umeň University (1977).
  52. Johansson K., Frech W., Cedergren A.
    Investigations of reactions involved in flameless atomic absorption procedures. Part VI. A study of some factors influencing the determination of lead in sulphate matrices.
    Anal. Chim. Acta 94 (1977) 245-256.
  53. Persson J-┼., Frech W., Cedergren A.
    Investigations of reactions involved in flameless atomic absorption procedures. Part V. An experimental study of factors influencing the determination of aluminium.
    Anal. Chim. Acta 92 (1977) 95-104.
  54. Persson J-┼., Frech W., Cedergren A.
    Investigations of reactions involved in flameless atomic absorption procedures. Part IV. A theoretical study of factors influencing the determination of aluminium.
    Anal. Chim. Acta 92 (1977) 85-93.
  55. Frech W., Cedergren A.
    Investigations of reactions involved in flameless atomic absorption procedures. Part III. A study of factors influencing the determination of lead in strong sodium chloride solutions.
    Anal. Chim. Acta 88 (1977) 57-67.
  56. Frech W., Cedergren A.
    Investigations of reactions involved in flameless atomic absorption procedures. Part II. An experimental study of the role of hydrogen in eliminating the interference from chlorine in the determination of lead in steel.
    Anal. Chim. Acta 82 (1976) 93-102.
  57. Frech W., Cedergren A.
    Investigations of reactions involved in flameless atomic absorption procedures. Part I. Application of high-temperature equilibrium calculations to a multicomponent system with special reference to the interference from chlorides.
    Anal. Chim. Acta 82 (1976) 83-92.
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