Immobilized fluorophores in dynamic chemiluminescence detection of hydrogen peroxide von Gubitz, Gerald, Van Zoonen, Piet, Gooijer, Cees, Velthorst, Nel H, Frei, Roland W

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Continuous flow alternating current polarographic detection of nitrazepam in liquid chromatography von Hanekamp, Herman B, Voogt, Willem H, Frei, Roland W, Bos, Pieter

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Use of ethylation for the gas and liquid chromatographic determination of linuron, diuron, and metoxuron and two of its degradation products: application to soil analysis von Lawrence, James F, Van Buuren, Carmen, Brinkman, Udo A. T, Frei, Roland W

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Enhanced fluorescence detection of dansyl derivatives of phenolic compounds using a postcolumn photochemical reactor and application to chlorophenols in river water von De Ruiter, Cornelis, Bohle, Jan F, De Jong, Gerhardus J, Brinkman, Udo A. T, Frei, Roland W

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Open-tubular mixer for gradient preparation in microbore high-performance liquid chromatography von Slais, Karel, Frei, Roland W

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Spectrophotometric determination of trace amounts of silver(I) von El-Ghamry, Mohamed T, Frei, Roland W

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Quenched peroxyoxalate chemiluminescence as a new detection principle in flow injection analysis and liquid chromatography von Van Zoonen, Piet, Kamminga, Dik A, Gooijer, Cees, Velthorst, Nel H, Frei, Roland W

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Band broadening in solid phase reactors packed with catalyst for reactions in continuous-flow systems von Nondek, Lubos, Brinkman, Udo A. T, Frei, Roland W

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Sensitive detection of biacetyl in liquid chromatography using time-resolved sensitized phosphorescence von Baumann, Robert A, Gooijer, Cees, Velthorst, Nel H, Frei, Roland W

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Post-column reaction detectors for high-performance liquid chromatography von Frei, Roland W, Jansen, Hans, Brinkman, Udo A. T

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Liquid chromatographic determination of pentachlorophenol in serum, using pre-column phase-transfer catalysed dansylation and post-column photolysis with fluorescence detection von de Ruiter, C, Brinkman, J H, Frei, R W, Lingeman, H, Brinkman, U A, van Zoonen, P

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Gas-nebulized direct liquid introduction interface for liquid chromatography/mass spectrometry von Apffel, James A, Brinkman, Udo A. T, Frei, Roland W, Evers, Evert A. I. M

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Immobilized 1-bromonaphthalene for quenched phosphorescence detection in high performance liquid chromatography von Baumann, Robert A, Gooijer, Cees, Velthorst, Nel H, Frei, Roland W, Aichinger, Ingrid, Guebitz, Gerald

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On-line thermionic detection for narrow-bore reversed-phase liquid chromatography von Maris, Frans A, Van Delft, Rob J, Frei, Roland W, Geerdink, Rene B, Brinkman, Udo A. T

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Transitory mobile phase environments for rapid selectivity changes in liquid chromatography: application to organic dyestuffs von Gluckman, Jennifer C, Slais, Karel, Brinkman, Udo A. T, Frei, Roland W

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Liquid chromatographic determination of guanidines with an anion exchange column used simultaneously as separator and postcolumn reagent generator von Jansen, Hans, Van der Velde, Elisabeth G, Brinkman, Udo A. T, Frei, Roland W, Veening, Hans

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Ultraviolet derivatization of digitalis glycosides as 4-nitrobenzoates for liquid chromatographic trace analysis von Nachtmann, Friedrich, Spitzy, Hans, Frei, Roland W

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Time-resolved quenched phosphorescence detection of chromate in water samples using paired-ion reversed phase high performance liquid chromatography von Baumann, Robert A, Schreurs, Marry, Gooijer, Cees, Velthorst, Nel H, Frei, Roland W

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A simple concentration procedure for trace metals for x-ray fluorescence and atomic absorption spectrometry von Knapp, Günter, Schreiber, Bernhard, Frei, Roland W.

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The factors affecting the reflectance spectra of some dyes adsorbed on alumina von Frei, Roland W., Zeitlin, Harry

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