title: Polarographic determination of extraction constants.
abstract: The extraction constant of three organic compounds containing nitrogen as a picrate ion pair in a water-chloroform system were determined by following polarographically the picrate concentration in the aqueous phase as a function of the added amount of reagent. The extraction constants were also determined spectrophotometrically (via batch extraction). The obtained results are in good agreement. The proposed method is applicable for extraction constants with values between 10(3) and 10(9).
authors: Department of Chemical Pharmacy, Subfaculty of Pharmacy, State University of Utrecht, the Netherlands.
authors: H A
authors: HA
authors: Dingjan
authors: W P
authors: WP
authors: Van Bennekom
authors: A
authors: A
authors: Bult
mesh_terms: D007477:Ions; D008433:Mathematics; D008956:Models, Chemical; D011048:Polarography / Q000379:methods*; D011343:Procaine / Q000032:analysis; D011398:Promethazine / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet
chemical_list: D007477:Ions; D000644:Quaternary Ammonium Compounds; D011343:Procaine; C009405:tetrabutylammonium; D011398:Promethazine