Abstract
A new analytical method for a herbicide, methyl 3-[1-(allyloxyimino)butyl]-4-hydroxy-6, 6-dimethyl-2-oxocyclohex-3- enecarboxylate, sodium salt (alloxydim-sodium), in ground water is described in this report. By this method, the total content of alloxydim-sodium and its degradation products found in soil can be analyzed. Alloxydim-sodium and its degradation products from ground water were converted to 2-methoxycarbonyl-3, 3-dimethylpentane-1, 5-dioic acid and 3, 3-dimethylpentane-1, 5-dioic acid by oxidation with hydrogen peroxide under reflux. After excess hydrogen peroxide was decomposed, the products were extracted with ethyl acetate under acidic condition. After the extract was dried up, the residue was methylated with diazomethane. These derivatives were determined using a gas chromatograph mass spectrometer (GC-MS) before and after a cleanup procedure by Sep-pak Florisil ® The detectable limit was 0.1ppb (μg/l) for each compound. The recovery of alloxydim-sodium and its degradation products ranged from 53 to 85%.
