(Hungarian). Gyógysterészet 37, 161-163 (1993). TLC of allantoin on cellulose with butanol - acetic acid - water 3:1:1. Visualization by spraying with p-dimethylaminobenzaldehyde and heating at 100 °C for 10 min.

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.

TLC as valuable instrument for preliminary proceedings suitable for chromatographic systems in HPLC separation problems. Reasons and preconditions for TLC as pilot procedure are given. 62 pesticides of 6 different substance classes, i.e. triazines, phenoxycarboxylic acids, urea herbicides, aniline derivatives, phosphoric acid esters, etc., are used for transmission of retention characteristics to HPLC. TLC of triazines on RP-8 with acetonitrile - water 3:2, of phenoxycarboxylic acids on RP-18 with acetonitrile - water - acetic acid 15:9:1, of urea herbicides on CN with hexane - tetrahydrofuran 3:2, of aniline derivatives on NH2 with hexane - tetrahydrofuran 7:3, of phosphoric acid esters on silica with hexane - tetrahydrofuran 3:2, of further pesticides on diol with hexane - tetrahydrofuran 7:3.

Chinese J. Hosp. Pharm. (Zhongguo Yiyuan Yaoxue Zazhi) 24 (5), 315-316 (2004). TLC of matrine on silica gel with benzene - acetone - ethyl acetate - ammonia 10:15:20:1. Detection by spraying with 5 % potassium iodobismuthate and 0.05 mol/L sodium nitrite in ethanol. Identification by comparison with the standard. Quantification by densitometry at 500 nm. Validation of the method by investigation of the linearity range of the calibration curve (2.14-10.70 µg/spot, r=0.999), precision (RSD=1.71 %, n=5), reproducibility (RSD=2.22 %, n=5), recovery (99.58 %, RSD 1.01 %, n=5), and interferences.

Acta Chrom. 9, 113-122 (1999). Selective separation of Hg2+ from spiked sea and industrial waste water samples. TLC of some inorganic pollutants on silica gel impregnated with potassium thiocyanate (0.01 -2.0 M) 1:1 mixtures of sodium chloride (0.01 - 1.0 M) and formic acid (0.01 - 1.0 M) as mobile phases. Detection with 5 % potassium ferrocyanide in water (for Fe3+, Cu2+, UO22+, VO2+, and Tl+), 0.05 % dithizone in carbon tetrachloride (for Zn2+, Cd2+, Pb2+, Bi3+, Hg2+, Ag+, and Tl+), 1 % dimethylglyoxime in ethanol (for Ni2+ and Co2+), 0.1 % aluminum (for Al3+) and 0.01 % thorine (for Th4+ and Zr4+). The effect of surfactants, halides and oxyanions on the separation of Hg2+ from UO22+ and Fe3+ was examined. The method was used to identify Hg2+, Pb2+, Cd2+, and Zn2+ in synthetic heavy metal sludge samples.

Phosphorus, Sulfur Silicon Relat. Elem. 184, 1139-1148 (2009). The new TLC system for sulfide ions detection is based on the use of 2,4,6-triphenylpyrylium salts as pre-chromatographic derivatization reagents. The cations L1 (2,4,6-triphenylpyrylium) or LN1 (4-[p-(N,N-dimethylamino) phenyl]-2,6-diphenylpyrylium) were used in the derivatization reactions in a tube or directly on the TLC plate before the developing step. TLC of L1 on silica gel with methanol – dichloromethane 1:5. TLC of LN1 on cellulose with phosphoric buffer (pH 6.0) – acetonitrile – 1,4-dioxane 4:2:1. The detection procedure allows selective and sensitive detection for sulfide anions at several dozen pmol/spot.

J. Chromatogr. A 1218 (19), 2745-2753 (2011). HPTLC of sucralose in waste water on silica gel with isopropyl acetate – methanol – water 15:3:1. The developing time was 15 min. Detection with p-aminobenzoic acid reagent. Quantification by absorbance measurement at 400 nm. The limit of quantification was 100 ng/L at a recovery rate of 80 % and the extraction of a 0.5 L water sample. An interlaboratory trial in 2008 showed good agreement of the sucralose content determined in four water samples by HPTLC and other methods (HPLC–MS/MS or HPLC–TOF-MS). The good accuracy and high sample throughput capacity proved HPTLC as a well suited method for quantification of sucralose in various aqueous matrices.

J. Planar Chromatogr. 25, 117-121 (2012). HPTLC of octachlorodipropyl ether on silica gel with toluene - acetic acid - water 20:20:1. Detection by spraying with 2 N alcoholic potassium hydroxide, followed by heating at 120 °C for 30 min, overspraying with 1 % silver nitrate in 30 % nitric acid and then exposed to unfiltered UV illumination for approximately 15 min. Quantitative determination by absorbance measurement at 399 nm. The hRf values of octachlorodipropyl ether and photodegradation products O1 and O2 were 93, 19 and 82, respectively.