Abstract
A method is described for the direct determination of eight substituted urea herbicides at the 0.1 to 1.0 p.p.m. level in soil using electron-capture gas chromatography. Residues of linuron were determined at 0.1, 0.5 and 1.0 p.p.m. in three soils of different organic matter content. Benzomarc, chlorbromuron, diuron, fluometuron, metobromuron, metoxymarc and neburon were determined at 0.1 and 1.0 p.p.m. in a single soil. The mean recovery for linuron was 88%. The recoveries obtained for the other seven herbicides ranged from 73 to 104%.
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