J. Agric. Food Chem. 39, 428-430 (1991). TLC of biphenyloxide and metabolites on silica with benzene - acetic acid 5:1, chloroform - acetone 4:1, cyclohexane - ethyl formate - formic acid 30:20:2. Detection under UV 254 and by spraying with diazotized p-sulfanilic acid. Densitometry.

Analyst 118, 777-778 (1993). TLC of pyrethroid insecticides on silica with petrol ether (60-80°) - diethyl ether 9:1 or cyclohexane - toluene. Detection by exposure to bromine vapor for 15 s, spraying with 0.1 % o-tolidine reagent and exposure to UV radiation for 5 min or to sunlight for 2 min. Detection limit 0.25 - 1.00 µg.

Teil 2: Die online Kopplung HPLC - AMD. (AMD (Automated Multiple Development); application and online coupling with reversed phase HPLC. Part 2: Online coupling HPLC-AMD). Dünnschicht-Chromatographie InCom Sonderband 1996, 53-71. Online coupling of HPLC and AMD is a two-dimensional separation system, where the completely different separation mechanisms of reversed-phase chromatography in a column and planar chromatography on silica are coupled. Online coupling of HPLC and AMD/HPTLC is capable of separating several thousand substances. With this system practical any number of pesticides in any kind of water sample can be quantified. Without clean-up, interferences of the matrix are reduced to nearly zero. The method is demonstrated by the analysis of a surface water sample spiked with pesticides.

J. Chromatogr. A 754, 17-31 (1996). A review with 118 references on the present state of the analysis of triazine herbicides stressing on the preconcentration techniques for water and soil samples such as liquid-liquid, supercritical-fluid and solid-phase extraction, and on the modern separation methods, e.g., TLC as well as GC, HPLC and CE in combination with selective detection.

Part III J. Planar Chromatogr. 13, 271-272 (2000). TLC of 20 pesticides (i. a. cypermethrin, deltamethrin, linuron, benomyl, endrin, hexachlororobenzene, simazine, propazine, lenacil, dimethoate, dodine, trifluralin) on silica gel with heptane and polar modifier (ethyl acetate, tetrahydrofuran, dioxane, diisopropyl ether). Detection under UV 254 or 366 nm or by exposure to iodine vapor.

Chromatographia 58 (11-12), 781-788 (2003). Ten urea herbicides and fungicides have been separated by use of two-dimensional thin-layer chromatography. The largest differences are obtained by combination of normal-phase (NP) system and reversed-phase (RP) system on cyanopropyl-bonded polar adsorbents and on two-adsorbent layer containing a narrow zone of octadecyl silica and adjacent a wide zone of silica (or vice versa). The greatest spread of points was obtained for combination of nonaqueous NP systems with ethyl acetate on silica and RP systems comprising a polar solvent (methanol) in water on octadecyl silica adsorbent wettable with water (RP-18W). A good spread of points was also obtained for pairs of normal-phase systems with heptane-ethyl acetate mobile phases and reversed-phase systems with water-dioxane mobile phases, both on cyanopropyl-bonded polar adsorbents. The correlations of Rf values in NP/RP systems were utilized in practical separation of a mixture of ten urea pesticides using 2D-TLC on these adsorbents. The plates were scanned and videoscanned showing the real pictures of TLC chromatograms.

J. Planar Chromatogr. 22, 235-240 (2009). HPTLC of pesticides (clofentezine, neburon, chlorfenvinphos, lenacyl, trifluralin, thiram, procymidone, flufenoxuron, tralkoxydim, propaquizafop, dinoseb) and water samples (sample preparation by solid phase extraction) on silica gel with ethyl acetate - n-heptane 1:4 and 3:7 in a horizontal chamber. Quantitative determination by diode array densitometry in the range of 200 to 600 nm. The limit of detection was between 40 and 650 ng/spot and the limit of quantification was between 120 and 1920 ng/spot.

J. Agric. Food Chem. 35, 100-1 05 (1987). Analytical and preparative TLC separation of fenvalerate and metabolites on silica 60 F 254 in one- and two-dimensional modes with 7 different solvent systems, e.g. hexane - toluene - acetic acid 3:15:2 and toluene - ether 10:1.