ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The determination of polysulfide sulfur in solutions of barium polysulfide and the relation of its maximum amount on time

G. Blőckinger

Pedagogische Hochschule in Bratislava

Abstract: A method for detn. of polysulfide S (I) in BaSx solns. is described. The equations are: 4H₃BO₃ + 4KCN + BaS₅ = BaB₄O₇ + H₂S + 4KSCN + 5H₂O, KSCN + 4Br₂ + 4H₂O = BrCN + H₂SO₄ + KBr + 6HBr, BrCN + 2KI = I2 + KCN + KBr, HCN + Br₂ = BrCN + HBr, and 10CH₂O + 4KCN + 2H₂O = (CH₂)₆N₄ + 4CH₂OH.COOK. In this method the formed HCN is eliminated quant. from the excessive KCN with HCHO, and the decompn. of KSCN is inhibited by decreasing the intensity and shortening the time of boiling. This method indicates that I forms in H₂O medium from a mixt. of BaS and S in relation to time. Max. amt. of I is formed after 8 to 10 hrs., and it is retained up to 20 hrs. Then I decreases, and after 200 hrs. it is completely lost.

Full paper in Portable Document Format: 141a32.pdf (in Slovak)

Chemical Papers 14 (1) 32–37 (1960)