パラローズァニリン吸光光度法による鋳銑鉄中極微量いおうの定量法

抄録

A method which is rapid and highly sensitive is described for the determination of microgram quantities of sulfur in pig and cast irons.
The sample is burned at 1450°C in a stream of oxygen. The sulfur is converted-to sulfurdioxide, which is absorbed into 0.2 M Na₂HgCl₄ solution, and determined photometrically with P-rosaniline and formaldehyde at 560 Mil after 20 min standing.
Vanadium pentoxide is used as a combustion aid.
The limit of identification of sulfur in this method is 0.05 μg per ml.
Time for analysis is about 30 min.
The reproducibility of analytical results by the proposed method as coefficient of variation is 4.1% for carbon steel (0.011%S).