Ac polarographic determination of 2-mer-captobenzimidazole in vulcanized rubbers
1978 Volume 27 Issue 11 Pages 687-692
Details
1978 Volume 27 Issue 11 Pages 687-692
Pure gum and filler-loaded compounds were prepared. One gram of its vulcanizates was extracted with acetone for 8 h. To the extract were added methanol (10 cm3), pyridine (2.5 cm3), [2M aqueous ammonia+2M ammonium chloride] (5 cm3), and acetone to make a solution of final 25 cm3. The ac polarographic peak potential for MBI was about -1.2V vs. S.C.E. in the region of (0.53)×10-4M. The peak height of the wave was proportional to the concentration of MBI in the same region. By this method, the recovery variation coefficient of MBI was 2.2% for 7 determinations. The determination was not interfered by dibenzothiazyle disulfide (I) or tetramethylthiuram monosulfide (II) compounded in vulcanized rubber. The variation coefficient was 3.7% of I and 2.6% of II, respectively, when (0.13)μg of each ingredient were added. In the case of vulcanized rubbers, the data of MBI in comparison with the MBI compounded were (4060)%. Its values were influenced by fillers.
