J. Planar Chromatogr. 10, 220-222 (1997). TLC of carbamates (baygon, carbaryl, carbofuran) as described in J. Chromatogr. 457, 383-386 (1988) with hexane - acetone 4:1 in a presaturated TLC chamber. After drying the plate was sprayed with 5% sodium hydroxide solution, and heated at 100°C for approx. 5 min. After cooling the plate was again sprayed uniformly with freshly prepared zinc(II) hexacyanoferrate(III) reagent. Detection limits were 1.5 µg/spot for baygon, 1 µg/spot for carbaryl, and 2 µg/spot for carbofuran.

J. Agric. Food Chem. 35, 138-144 (1987). TLC of vamidothion (0,0-dimethyl-S-(2-((1-(methyl carbamoyl)ethyl)thio)ethyl)phosphorothioate) and metabolites on silica in one- and two-dimensional mode with 7 solvent systems, e.g. acetonitrile - methanol 9:1, acetonitrile - water 85:15, dichloromethane - ethanol 9:1. Detection by UV 254 nm or spraying with either 0.5 % 2,6-dibromo-N-chloro-p-benzoquinoneimine in cyclohexane or 0.25 % palladium chloride in 0.2 N HCl. Radioscanning.

J. Planar Chromatogr. 11, 90-93 (1998). Determination of the relationships between Rf values and mobile phase composition for eleven moderately polar pesticides in systems of the type silica + nonpolar or weakly polar diluent (heptane or chloroform) - polar modifier (ethyl acetate, tetrahydrofuran, dioxane, or acetone). TLC of atrazine, chlorfenvinphos, methoxychlor, carbaryl, alachlor, bromopropylate, captan, dinoseb, diuron, fenchlorphos, fenitrothion on silica gel with e.g. ethyl acetate - heptane. Detection under UV at 254 nm or 365 nm or by exposure to iodine vapor. Useful information for isolation of the pesticides tested.

J. Liquid Chrom. 8, 1327-1346 (1985). TLC separation of aldicarb, bavistin, carbofuran, dimecron and oxamyl on soil coated plates (particle size100 mesh) using water (pH 7) and water of pH 4 (adjusted with 0.1 N HCI) and pH 10 (adjusted with 0.1 N NaOH). Detection of aldicarb, bavistin, carbofuran, oxamyl by spraying with 5 % methanolic KOH followed by 0.1 % p-nitrobenzenediazonium tetrafluoroborate. Detection of dimecron with 0.5 % brilliant green in acetone.

J. AOAC Int. 82, 25-30 (1999). Validation of video densitometric and classical slit-scanning determinations of pesticides on TLC plates for linearity, precision, and detection limit. A comparison of results showed that slit-scanning is more sensitive and more precise than video densitometry. According to validation requirements the relative standard deviation of 3.5 - 5.3% for video densitometry is, however, acceptable . Linearities are considered as very good and almost identical for both techniques. The main advantage of video technology is the speed of a few seconds compared with 20 min with scanning densitometry; it provides excellent archiving facility, and image and chromatographic data can be stored together, edited, and used for many tasks. TLC of propham, chlorpropham, tetramethrin, a-cypermethrin, diflubenzuron, atrazine on silica gel with methanol - water 4:1.

J. Chromatogr. 365, 309-314 (1986). Study of the selectivity and sensitivity of some TLC detection systems for visualization of organochlorine and organophosphorus insecticides and thiocarbamate herbicides, and quantification by densitometry. Investigated: silvernitrate-2-phenoxyethanol, 4-(4'-nitrobenzyl) pyridine, 2,6-dibromobenzo-quinone-N-chloroimine and its analogues.

J. Planar Chromatogr. 12, 425-428 (1996). TLC of ethylenethiourea on silica gel with either chloroform - butanol - methanol - water 200:10:2:1 or chloroform - ethyl acetate - methanol 3:2:1. Detection either under UV 254 nm or by spraying with 2% aqueous sodium nitroferricyanide prepared by dissolving 2 g of Na2Fe(CN)5N ? 2H2O and 4 g of sodium hydroxide in 40 mL of distilled water, addition of 1 g of ammonium peroxodisulfate and dilution to 100 mL with water.

Analyst 113, 1747-1748 (1988). Description of two specific spray reagents for the detection of carbamate insecticide carbaryl: a) 1% (m/v) copper (II)chloride followed by 0. 1% ammonium metavanadate and b) 0. 5% (m/v) potassium hexacyanoferrate (III) in 0. 5% (m/v) potassium hexacyanoferrate (III) in 0. 5% (m/v) sodium hydroxide. Recovery: 100%. Reagent a) has higher sensitivity for degradation products of carbaryl, 1-naphthol, whereas b) has the same sensitivity for both carbaryl and 1-naphthol, ca. 1ng.