Takeda, M; Suzuki, T; Otsuki, K; Sekita, H; Fujisawa, K; Hoshi, M
PESTAB (6 references) (Japanese) jThe removal of interfering substances containing organosulfur, such as methyl propyl disulfide and allyl propyl disulfide, in the pesticide analysis of onion using gas chromatography with ECD was examined after treatment with potassium permanganate. The stability of 13 organochlorine insecticides, alpha-, beta-, gamma-, and delta-BHC, p,p'-DDT, p,p'-DDE, p,p'-DDD (TDE), dicofol, aldrin, dieldrin, endrin, heptachlor, and heptachlor epoxide, to potassium permanganate treatment was studied. Aldrin and heptachlor were quite unstable, and p,p'-DDE and p,p'-DDD were somewhat unstable; however, the other insecticides were very stable under the conditions studied. The large interfering peak found in the gas chromatogram of untreated extract of onion decreased with increasing amounts of potassium permanganate used in the treatment. It was shown in the present report that the recovery levels of insecticides added to onion homogenates were between 77 and 97%, except for aldrin, heptachlor, p,p'-DDE, and p,p'-DDT. The recoveries of p,p'-DDE and p,p'-DDD were very low, 56 and 54%, respectively, and recoveries of aldrin and heptachlor were practically zero. s,
