J. Planar Chromatogr. 2, 290-296 (1989). HPTLC separation of 15 urea herbicides on alumina with dichloromethane, on silica C-18 with methanol - water 75:25, and on silica with chloroform - diisopropylether 9:1, and diisopropyl ether - isobutyl methyl ketone 8:2. Detection by fluorescence quenching and/or reflectance resp. absorbance scanning.

J. Agric. Food. Chem. 38, 567-573 (1990). 2D-TLC of 14C residues on silica with dichloromethane - acetone - acetic acid 60:40:5 and acetonitrile - water - NH3 40:9:1; visualization by autoradiography. Substances investigated: monocrotophos, N-methylacetoamide, O-desmethyl-monocrotophos, N-(hydroxymethyl)-monocrotophos, 3-hydroxy-N-methylbutyramide.

Biochemical Systematics and Ecology 22, 43-51 (1994). TLC of the pigment on silica with methanol - water 2:1 with the addition of a few drops of ammonia solution. TLC provides a sensitive and cost effective comparative technique for identifying the pigment in a wide range of Lepidoptera.

Analyst 119, 415-416 (1994). TLC of carbaryl and the hydrolysis product of carbaryl, 1-naphthol, on silica with hexane - acetone 4:1 in a saturated chamber. Detection after drying by spraying with 10% sodium hydroxide solution, followed by freshly prepared 1% ammonium cerium(IV) nitrate reagent. A violet spot was observed; on spraying with 10% sodium nitrite solution the intensity of the colour increased. The sensitivity of the reagent is abt. 0.1 µg.

J. Chromatogr. A 725, 199-202 (1996). TLC of heavy metals and their complexes with dithizone, 4-(2-pyridylazo)resorcinol and ethylenediaminetetraacetic acid on cellulose, Florisil, Polygram Ionex-25 SA-Na or Polygram Ionex-25 SB-Ac with various solvent systems. Elaboration of the conditions for SPE of the metal ions in the title matrix after microwave mineralization, and in air after alkaline absorption.

J. Planar Chromatogr. 18, 423-426 (2005). HPTLC of antibiotics (sulfadimidine, sulfadiazine, sulfaguanidine, trimethoprim) on silica gel without chamber saturation in a twin-trough chamber with chloroform - methanol 89:11. Quantification by videodensitometry at 254 nm. Limit of detection was 0.05 µg per spot for sulfadimidine, sulfadiazine, and sulfaguanidine, and 0.1 µg per spot for trimethoprim.

Chromatographia 65 (1-2), 105-110 (2007). HPTLC of seven pharmaceuticals, enrofloxacine, oxytetracycline, trimethoprim, sulfamethazine, sulfadiazine, sulfaguanidine and penicillin G/procaine in production wastewater (obtained by solid-phase extraction on hydrophilic-lipophilic balance cartridges with methanol) on cyano phase with 0.05 M oxalic acid - methanol 81:19 after optimization of chromatographic separation by systematic variation of the mobile phase composition using genetic algorithm approach. Quantification by videodensitometry at 254 and 366 nm. Validation of the method by investigation of linearity ranges (1.5 - 15.0 µg/L for enrofloxacine, 100 - 500 µg/L for oxytetracycline, 150 - 600 µg/L for trimethoprim, 300 - 1100 µg/L for sulfaguanidine and 100 - 400 µg/L for sulfamethazine, sulfadiazine and penicillin G/procaine, R > 0.991), its mean recoveries (74.6 - 117.1% and 55.1 - 108.0% for wellspring water and production wastewater, respectively). Application of the method in determination of pharmaceuticals in wastewater samples from pharmaceutical industry.

J. Planar Chromatogr. 20, 283-285 (2007). TLC of benzalkonium bromide homologs (with C2, C4, C6 to C16, C18 C20) on silica gel in twin-trough chambers with isopropanol - water - acetic acid 1:1:4 or methanol - chloroform - acetic acid 50:10:1. Detection with iodine vapor or by derivatization with Dragendorff’s reagent.