Investigation of the drying conditions for amidosulfuric acid.
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.
Asakai
Toshiaki
T
National Institute of Technology and Evaluation, Tokyo, Japan. asakai-toshiaki@nite.go.jp
Minegishi
Ryota
R
Inaba
Norie
N
Ishimura
Yutaka
Y
Murayama
Mariko
M
Tanaka
Tatsuhiko
T