Colorimetric Determination of 2-Chlorophenyl N-Methylcarbamate

2-Chlorophenyl N-methylcarbamate was determined colorimetrically. It was hydrolyzed with a veronal buffer solution (pH 8.0) to give corresponding 2-chlorophenol, which was coupled 4-nitrobenzenediazonium fluoroborate to produce a color having a maximum absorption at 520 mμ. The developed color was very stable. On the other hand, contaminated 2-chlorophenol was adsorbed in treated alumina before being hydrolyzed. Other contaminated impurities gave little influences. Technical materials and some formulated products were determined and good results were obtained.