J. Chromatogr. A 1116 (1-2), 272-276 (2006). Application of TLC to fractionate well-characterized aquatic humic materials coupled with the novel evaluation of the trihalomethane formation potential of the fractionated materials. HPTLC on silica gel with methanol - ethyl acetate 2:1. Identification of three common fractions based on retention factor (Rf) in all substances examined.

J. Agric. Food Chem. 50, 4619-4627 (2002). TLC on silica gel of alachlor with n-hexane - ethyl acetate 1:1, of chlorpyrifos with n-hexane - toluene 7:3, of deltamethrin with toluene - cyclohexane 7:3, of endosulfan and endosulfan-sulfate with n-hexane - acetone 9:1, of monocrotophos with acetonitrile - water 3:2, of simazine with n-hexane - acetone 1:1, of triflurolin with n-hexane - acetone 3:1. The spatial distribution of radioactivity on the TLC-plates was measured and integrated by an Instant Image Analyzer.

J. High Resol. Chromatogr. 9, 224-235 (1986). Quantitative HPTLC determination of selenium as 2, 1,3-naphthoselenodiazole on silica with chloroform. After developing to 5 cm the wet plate was dipped 3 times into a solution of Triton X 100 - chloroform 1:4 with evaporation of the solvent in between by storing the plate in the dark for 15 min. at 20°C. Quantification by measuring the fluorescence at 560 nm. Dipping in paraffin oil enhances and stabilizes fluorescence.

J. Chromatogr. 754, 273-278 (1996). TLC on silica with the AMD system using a stepwise gradient based on acetone - dichloromethane - hexane. Detection under UV 254 nm. Quantification by densitometry. Detection limits 25 ng - 400 ng per spot. Precision < 9%. Recovery 80 %.

CBS 112, 5-7 (2014). HPTLC-AMD of sediment samples and standards 17α-ethinylestradiole, 17ß-estradiole, estrone and bisphenol A on silica gel with a two step gradient, first step with methanol to 20 mm, second step with ethyl acetate - n-hexane 1:1 to 80 mm. Detection with the p-YES-bioassay by dipping in yeast cell suspension (the cell number of the genetically modified yeast strain (Saccharomyces cerevisiae BJ3505) was determined by photometry and diluted to 150 ± 50 Formazin Attenuation Units) followed by incubation for 3 h at 30 °C in a saturated steam atmosphere. Then the enzyme substrate solution (0.5 mg/mL 4-methylumbelliferyl-ß-D-galactopyranoside solution) was sprayed on the TLC plate followed by a second incubation for 30 min at 37 °C. Detection under UV 254 nm and quantitative fluorescence measurement at UV 320/>400 nm. Two blue fluorescent zones with estrogenic activity were detected at hRF 65 and 80.

Microbiol. Res. 163, 307-313 (2008). HPTLC of norharmane from cyanobacterial culture medium extracts on silica gel with ethyl acetate - methanol - water 200:33:27 or ethyl acetate - formic acid - water 20:2:1. The hRf values of norharmane were 65 and 20, respectively. Evaluation under UV 254 nm without further derivatization. The screening of microalgal culture medium was performed by HPTLC and HPLC.

Chem. (Bunseki Kagaku) 33, 519-523 (1984). (Japanese). (Colorimetric determination of dispersed oils from river water by thin-layer chromatography.) TLC of various mineral oils, glycerides and fatty acids on silica with water - saturated chloroform. Determination by first treating the spots with a mixture of H2SO4, K2Cr2O7 and Ag2SO4 and then measuring the absorption of Cr(III).

J. Chromatogr. 688, 383-389 (1994). HPTLC of atrazine and simazine herbicides on silica with nitromethane - tetrachloromethane 1:1. Detection limits 30 and 60 ng/L for atrazine and simazine, respectively, at the 80 - 400 ng/L fortification level in the surface water. R.S.D. < 12%. Overall recoveries, 58-93%. The method is sufficiently selective and sensitive in screening of the compounds below the maximum residue limits of the European Community.