title: Pulse polarography of nitrosated GPC fractions of humic acids.
abstract: A pulse polarographic method for the analysis of humic acids fractionated by gel permeation chromatography is described. It is concluded that the pulse polarography of the nitroso-derivatives, already reported as an analytical method for the determination of humic acids, really gives responses due to the presence of iron in the samples. Atomic-absorption measurements confirm this conclusion quite unambiguously.
authors.affiliation: Istituto Chimico G. Ciamician, Università di Bologna, Via Selmi 2, Bologna 40126, Italy.
authors.forename: M T
authors.initials: MT
authors.lastname: Lippolis
authors.forename: V
authors.initials: V
authors.lastname: Concialini
authors.forename: G
authors.initials: G
authors.lastname: Chiavari