摘要：The method of selective extraction of paraquat was investigated by the use of diamine green B (ion association reagent). The recommended procedures are as follows : To 2 ml of the aqueous solution of sample is added 2 ml of the aqueous solution of diamine green B (13.617 mg/ml) and 2 ml of acetone. After standing for 1 min, the mixture is filtered. The precipitate is washed with 100 ml of water-acetone (2 : 1). To the precipitate together with the filter paper, 30 ml of 10 N hydrochloric acid is added and the mixture is boiled. After cooling, the solution is filtered to remove diamine green B and the filter paper. Paraquat in the filtrate is determined by spectrophotometry. The paraquat in green tea, human urine, and milk was analyzed by this method. But paraquat in the blood could not be determined because of the existence of interfering substances.
关键词：paraquat;diamine green B of ion association reagent;infrared spectrum;gas chromatography;ultraviolet spectrum
