Phenylamide pesticides

MA El-Dib, OA Aly. Colorimetric determination of phenylamide pesticides in natural waters. J Assoc Anal Chem 55 1276-1279, 1972. 

Nonetheless, derivatization methods have been successfully employed [56-58,65], most notably via use of the diazonium salt of 4-nitroaniline, For instance, in the study of phenylamide pesticides, no resonance was observed from these colorless compounds however, after derivation to azo dyes, detection limits of (2-4) X 10 M were achieved for monuron, diuron, a-napthylacetamide, and /3-napthylacetamide. Selectivity in distinguishing derivatized products from isomers of monosubstituted phenols (i.e., ortho, meta, and para) has also been shown to be successful, as illustrated in Fig. 8. Moreover, coupling the sensitivity and selectivity of RRS to the well-known spot-test method (qualitatively identifies colorless solutions only by visual identification of the colored products), a more accurate and sensitive characterization method of trace organic compounds is achieved. Such work has been conducted by Nakamura et al. in the characterization and detection of phenols and heterocyclic aromatic compounds on fruit rinds and food preservatives [58]. 

S Higuchi, O Aiko, S Tanaka. Determination of trace amounts of some phenylamide pesticides by resonance Raman spectrometry. Anal Chim Acta 116 1-6, 1980. 

Figure 3. Proposed chemical reactions leading to stabilization of phenylamide, phenylcarbamate and phenylurea pesticides In soils. (From ACS Symposium Series No. 29, 1976) (173).

---