title: Investigation of the drying conditions for amidosulfuric acid.
abstract: The drying conditions for primary standards of volumetric analysis have a significant effect on the titration results due to changes in the purity, stability and homogeneity. Amidosulfuric acid, a strong acid used as a reference material for volumetric analysis in Japan, was dried in a vacuum desiccator or heated at different temperatures, and then measured by Karl-Fischer titration, thermogravimetry/mass spectroscopy (TG-MS), ion chromatography and coulometric titration. The optimum drying conditions were at 50 degrees C for 24 h with crushing.
authors.affiliation: National Institute of Technology and Evaluation, Tokyo, Japan. asakai-toshiaki@nite.go.jp
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Asakai
authors.forename: Ryota
authors.initials: R
authors.lastname: Minegishi
authors.forename: Norie
authors.initials: N
authors.lastname: Inaba
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ishimura
authors.forename: Mariko
authors.initials: M
authors.lastname: Murayama
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Tanaka