Abstract
The analytical method of 1-naphthyl-N-methylcarbamate (NAC) residues in agricultural products was investigated.
It was found that the color formed by coloring reaction in basic medium is much more stable than that in acidic one, however, some carbamates may prevent the determination of NAC in basic medium.
In clean-up of NAC by coagulating solution, removal of colored materials was uncomplete when the samples contain abundantly colored materials. In these cases, further purification procedures were required. Therefore, when there are many samples in the routine work, the column chromatographic purifications are convenient rather than the coagulation procedure.
The recoveries of NAC added into vegetables were examined by the proposed method, and it was shown that recoveries are between 91% and 96.5%.
