1970 Volume 19 Issue 3 Pages 339-343
A method was proposed for gravimetric determination of nickel, based on the fact that nickel formed a precipitate with thenoyltrifluoroacetone (TTA) and either pyridine or picoline. The molecular formula of the precipitate was considered to be Ni(tta)2(py or pico)2, where tta, py and pico represent, respectively, univalent anion of TTA, pyridine molecule and picoline molecule. The precipitation of nickel was quantitative with pyridine, picoline and methylethyl pyridine but was not quantitative with ammonia and trimethylamine.
The recommended procedure is as follows : the picoline or pyridine (preferrably β- or γ-picoline) solution of TTA is mixid with nickel solution, and the mixture is diluted with water, adjusted to pH 59, allowed to stand overnight to settle the precipitate. It is then filtered through a weighed sintered-glass filter, washed, dried and weighed.
The method was sensitive, although it was neither selective nor specific. Less than 10 mg of nickel was successfully determined.
