Further Studies on Degradation of Fenitrothion in Soils

MIKAMI Nobuyoshi, SAKATA Shinoi, YAMADA Hirohiko, MIYAMOTO Junshi

doi:10.1584/jpestics.10.491

The degradation of fenitrothion (I) and 3-methyl-4-nitrophenol (II), one of the major degradation products in soil, was studied, using ¹⁴C preparations labeled at the phenyl ring. In two kinds of aerobic upland soils, I and II degraded with an initial half-life of less than 7 days. A main degradation route of I was a cleavage of the P-O-aryl linkage, leading to the formation of II which underwent further metabolism to ¹⁴CO₂. In soils treated initially with II, a trace amount of 3-methyl-4-nitrocatechol was detected. When soils containing the bound ¹⁴C residues arising from I were mixed with fresh soil, 17.5 to 22.4% of the bound ¹⁴C was mineralized to ¹⁴CO₂ over 22-week period. In two kinds of submerged soils, I degraded mainly via reduction of the nitro group to the amino group with an initial half-life of less than 7 days. The resultant product was bound to the soils or metabolized further to the formylamino and acetylamino derivatives. In addition, a relatively large amount of ¹⁴CO₂ was evolved from the soils. When the conditions of the submerged soils were altered to those of aerobic upland by draining the flooded water, the bound ¹⁴C residues were partially mineralized to ¹⁴CO₂. Furthermore, the bound ¹⁴C residues in upland and submerged soils were hardly taken up by bean and rice plants, respectively.

Further Studies on Degradation of Fenitrothion in Soils

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