J. Planar. Chromatogr. 1, 252-254 (1988). TLC on BaSO4-CaSO4, impregnated with coconut oil. Detection by spraying with an ethanolic solution of bromophenol blue (0.1%). Quantification by spectrophotometry 520 nm after elution. Detection limit, 400 µg (!).

Talanta 39, 1361-1367 (1992). Use of the reaction between thiocarbamate herbicides and 2.6-dichlorobenzoquinone-N-chloroimine or 2,6-dibromo-benzoquinone-N-chloroimine for the detection of these herbicides on TLC plate with high sensitivity. Discussion of the reaction mechanism. Also IR, NMR and MS.

J. Liq. Chromatogr. 23, 273-280 (2000). Description of two methods, one on the basis of relative error in yi (YWLS) and another on the basis of 1/xi as a weighting factor (XWLS), for the calculation of calibration functions and comparison with conventional ordinary (OLS) and simple weighted least square method (WLS). Instead of the coefficient of correlation, six coefficients of quality are used to characterize the quality of the calibration functions. - TLC of atrazine, propazine and simazine on silica gel using toluene - acetone 17:3. Detection under UV 254 nm; quantitation by densitometry in reflectance mode at 225 nm.

J. Planar Chromatogr. 18, 85-88 (2005). 11 HPTLC of fenoxaprop-p-ethyl and degradation products on silica gel (prewashed with methanol - chloroform 1:1 and activated at 110 °C for 30 min) in a twin-trough chamber with toluene - dichloromethane 7:3. Visualization on irradiation with an UV lamp at 236 nm. Quantitative determination by absorbance measurement at 236 nm.

J. Planar Chromatogr. 25, 262-268 (2012). HPTLC of paraquat (1), diquat (2), difenzoquat (3), mepiquat (4), and chloromequat (5) in water on silica gel with 1-propanol - methanol - 2.5 N NaCl 1:1:3. Quantitative determination by absorbance measurement between 500 and 535 nm. The hRf values of compounds (1) to (5) were 21, 30 36, 52 and 56, respectively. Limits of quantification were 5 ng/zone for (1), 2 ng/zone for (2), 25 ng/zone for (3), 15 ng/zone for (4) and 9 ng/zone for (5). Recovery rates for compounds (1) to (5) were 50.7, 65.2, 59.6, 45.1 and 33.7 %, respectively.

J. Planar Chromatogr. 2, 378-381 (1989). Reciprocal enrichment of two developing directions in instrumental TLC by optimization of separation applying Soczewinski’s principle. Identification with diffuse reflectance electronic spectra recorded directly from the spots of the separated substances, shown with diphenyl ether derivatives as examples.

J. Planar Chromatogr. 7, 72-74 (1994). TLC of s-triazines (simazine, atrazine, ametryne, prometryne, aziprotryne) on "Aminoplast" with cyclohexane - acetone 9:1, on cellulose with water - acetone 7:3 and on acetylated cellulose with water - methanol 1:1. Observation under UV 254 nm. Densitometry by absorbance at 254 nm.

J. Planar Chromatogr. 13, 281-284 (2000). RPTLC of 10 new 1-(arylaminomethyl)-1,2,4-triazoles on silica gel impregnated with paraffin oil with water - methanol mixtures. Identification of the spots under UV 254 nm. Retention constants were determined and good correlation was found between the retention constants and (1) log P, (2) the new isocratic chromatographic hydrophobicity index and (3) the biological activity of the compounds investigated.