Abstract
4, 6-Dichloro-7-(2, 4, 5-trichlorophenoxy)-2-trifluoromethylbenzimidazole (DTTB), which was used as a mothproofing agent in wool fabrics, was quantitatively determined by high performance liquid chromatography using an ultraviolet spectrophotometric detector. DTTB was extracted with diethyl ether from a 10% sodium hydroxide solution of wool fabrics. The extract was cleaned up by the use of SEP-PAK C18 cartridge with acetonitrile-dilute aqueous ammonia (1/2, 000) (1:2) as an eluant. The eluant was concentrated and dissolved in ethyl alcohol containig anthracene as an internal standard. DTTB was separated on a column packed with LiChrosorb RP-18 by the use of acetonitrile-0.0087M acetic acid and 0.0013M ammonium acetate in water (3:1) as the mobile phase, with detection at 220nm. The calibration curve was linear in the range from 1ng to 80ng. The limit of detection was 1ng of DTTB and 0.4μg/g in samples. The recoveries of DTTB added to diethyl ether extracts from socks and neckties were 97.2-99.5% and 97.4-98.9%, respectively.
