R.W. Frei

Two-dimensional column liquid chromatographic technique for resolution of complex mixtures

F. Erni, R.W. Frei · Journal of Chromatography A · 1978 · 267 citations

Supercritical Fluid Chromatography, Separation Science, Complex Mixtures +8

Trace enrichment of polar compounds on chemically bonded and carbonaceous sorbents and application to chlorophenol

C.E. Werkhoven-Goewie, U.A.Th. Brinkman, R.W. Frei · Analytical Chemistry · 1981 · 192 citations

Chemical Engineering, Environmental Chemistry, Carbonaceous Sorbents +12

Influence of organic bases on the stability and separation properties of reversed-phase chemically bonded silica gels

A. Wehrli, Jennie C. Hildenbrand, Hubert Keller et al. · Journal of Chromatography A · 1978 · 161 citations

Materials Science, Chemical Engineering, Engineering +9

The separation of nonapeptides by reversed-phase high-performance liquid chromatography

K. Krummen, R.W. Frei · Journal of Chromatography A · 1977 · 115 citations

Biochemistry, Separation Science, Analytical Chemistry +5

Liquid chromatographic trace enrichment with on‐line capillary gas chromatography for the determination of organic pollutants in aqueous samples

Ebrahim Noroozian, F.A. Maris, Michel W. F. Nielen et al. · Journal of High Resolution Chromatography · 1987 · 107 citations

Engineering, Pesticide-residue Analysis, Chemical Engineering +20