Arsenic determination with graphite-cloth ribbon in graphite-furnace atomic-absorption spectrometry.
The determination of arsenic by atomic-absorption spectrometry with use of a graphite-cloth ribbon placed inside various types of graphite tubes was investigated. It was found that the graphite-cloth ribbon greatly enhances the sensitivity for arsenic and reduces the interferences from various heavy metals, especially when it is placed inside a pyrolytic graphite tube and a nitric acid matrix is used. This is attributed to condensation of arsenic on the ribbon, owing to a temperature lag during the drying and ashing cycles, and to the formation of interlamellar compounds of arsenic with graphite.
Iwamoto
E
E
Department of Chemistry, Faculty of Science, Hiroshima University, Hiroshima 730, Japan.
Chung
C H
CH
Yamamoto
M
M
Yamamoto
Y
Y