抄録
Polarographic determination of free sulfur in anethole-trithione [5-(p-methoxyphenyl)-1, 2-dithiacyclopentene-3-thione] was carried out by the use of pyridine-hydrochloric acid as the supporting electrolyte. Free sulfur gives a reduction wave with E1/2=-0.33V(vs. S.C.E.) in DC polarogram even it the presence of anethole-trithione, and the wave height is proportional to the concentration, The wave height of free sulfur is influenced by the amount of anethole-trithione and dioxan in the electrolytic solution and also by the period of contact time with mercury. Therefore, polarographic condition must be controlled for the determination. The condition shown in Table I is adequately applied for the sample of anethole-trithione containing 0.1-0.7% free sulfur. The amount of free sulfur can be determined by the calibration curve prepared for the concentration of sulfur ranging from 1×10-5M to 1×10<-4>M in the presence of 0.5 to 2×10-3M of anethole-trithione.
