J. Planar Chromatogr. 2, 317-320 (1989). HPTLC separation of fluoranthene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(k)perylene on silica, impregnated with caffeine (immersion in a solution of 4 g caffeine in 96 g dichloromethane) with diisopropylether - hexane 4:1; ascending or horizontal development at - 20°C with dichloromethane as mobile phase. Detection by fluorimetry, partly after immersion of the plate in a liquid paraffin - hexane solution 1:2.

(Layer impregnated with ammonium molybdate for TLC of water contaminated with phenols.) Z. Wasser-Abwasser-Forsch. 23, 113-115 (1990). TLC of phenols on silica impregnated with 5% ammonium molybdate using toluene-acetone-chloroform 49:35:25 as mobile phase. Detection limit for qualitative determination 0.6-1 µg per spot and for semiquantitative determinations between 2 and 10 µg.

J. Planar Chromatogr. 6, 372-377 (1993). TLC of phenol, 2-cresol, 4-cresol, 1-naphthol, and leachates (after oxidative coupling with 3-methyl-2-benzothiazolinone hydrazone, MBTH) on silica with dichloroethane. For certain phenols with very similar Rf values increased resolution could be achieved by multiple elution. In-house evaluation was performed by densitometry in absorbance mode at 500 nm.

J. Planar Chromatogr. 8, 300-305 (1995). TLC and HPTLC of 39 phenols on RP-18 silica and silica in 12 mobile phase systems, i. a. toluene - acetone 4:1, acetonitrile - water 7:3, chloroform, toluene. Detection under UV at 215 nm and 254 nm. Also indication of detection limits. Easy and economic TLC procedure.

Fresenius J. Anal. Chem. 354, 889-891 (1996). HPTLC of 11 phenols (2-, 3-, 4-chlorophenol, 2,4-di- and 2,4,6-trichlorophenol, 4-chloro-3-methylphenol, pentachlorophenol, 2-butyl-4-chlorophenol, 2,3,5,6-tetrachlorophenol, 4-chloro-2-methylphenol, 2,4,5-trichlorophenol) on silica with acetonitrile - water 7:3. Quantification by densitometry at 254 and 216 nm, respectively.

J. Planar Chromatogr. 17, 444-448 (2004). TLC of 16 naphthalimide dyes, 17 benzanthrone dyes, 20 triazine dyes, and 17 fluorescent brighteners on (mainly) silica gel with n-heptane - acetone 1:1 and 3:1, chloroform - methanol 1:1 and 2:1, n-heptane - benzene - chloroform 3:2:1, n-heptane - chloroform - acetone 2:2:1, n-butanol - pyridine - 25 % ammonia 1:1:1, chloroform - methanol - 25 % ammonia 11:5:1, n-propanol - 25 % ammonia 1:1 and 2:1, n-butanol - acetic acid - water 4:1:5. Quantitative determination by UV-scanning densitometry.

Acta Chrom. 11, 108-117 (2001). TLC of polyaromatic carbonyl compounds most commonly found in environmental samples (acridone, 1,2-naphthoquinone, 9,10-phenanthrenequinone, acenaphthenequinone, xanthone, 1-aminoanthraquinone, anthrone, 1,4-chrysenequinone, anthraquinone and 9-fluorenone) on silica gel and RP-18. Different combinations of solvents were evaluated as mobile phases. The best separation was obtained by use of pure dichloromethane on silica gel and methanol – water – acetonitrile 3:2:1 on RP-18 in a horizontal chamber. Evaluation under UV 254 nm and 366 nm. Quantitative determination of acridone by fluorescence measurement at 390/>400 nm, and by absorbance measurement at 250 nm for the other compounds.

CBS 98, 9-11 (2007). Quantitative HPTLC of polycyclic aromatic hydrocarbons (PAH) from water samples, on caffeine-impregnated silica gel, with isopropyl acetate in a precooled (-20 °C, 30 min) twin-trough chamber without chamber saturation over 70 mm at -20°C. After application the dry plate was first equilibrated in the solvent-free trough for 10 min at -20 °C. Qualitative HPTLC at room temperature in the horizontal developing chamber with isopropyl acetate - n-hexane 3:1 over 50 mm. Detection by dipping in paraffin - toluene 1:1 (for fluorescence enhancement). Quantitative determination by fluorescence measurement at UV 366/>400 nm. Qualitative evaluation under UV 366 nm. The method is based on the German standard DIN 38407-7 for quantitative determination of 6 PAH but uses isopropyl acetate as a chlorine-free solvent instead of dichloromethane.