西南石油大学学报(自然科学版) ›› 1988, Vol. 10 ›› Issue (3): 71-76.DOI: 10.3863/j.issn.1000-2634.1988.03.009

• 油田化学 • Previous Articles     Next Articles

DETERMINATION OF COPPER IN NON-CHROMIUM-LIGNOSULFONATE—IODOMETRIC METHOD AND ITS IMPROVEMENT

Yang Shi-guang   

  1. （Dept. of Applied chemistry）
  • Received:1987-10-09 Revised:1900-01-01 Online:1988-08-20 Published:1988-08-20
  • Contact: Yang Shi-guang

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Abstract: The copper in the lignosulfonate can be determined by the indirect iodometric method. To decompose the sample, we can put in some H2SO4 (1: 1)and some solid (NH4)2S2O8, which is a strong oxidant in an acidic medium. The interference from the iron (Ⅲ) in the sample can be oliminated by the addition of a mixed masking agent NaF+K2[CH(OH)COO)2. And the iodine absorbed by the solid I2can be released by the addition of thiocyanate ion.

Key words: mud additive, Lignocellulose, copper