직/편성물 염색

Afterchrome dyeing of wool. I. Chromium in the effluent, analystical determination and characterization of influencing factors

  • 출판일1997.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 288
As a consequence of increasing legal restrictions on the concentration of chromium in industrial discharges, after-chrome dyeing of wool has been re-evaluated. Special regard was given to the distribution of trivalent and hexavalent chromium species in the individual process stages (chroming, rinsing and ammonia aftertreatment baths) of afterchrome dyeing. Recommendations are outlined to give minimum chrome residues in the effluent and to avoid the distribution of the toxic hexavalent chromium species into the environment. The efficiency of the thiosulphate procedure is doubtful for improving the exhaustion of total chromium. Subsequent alkaline treatments of chrome-dyed wool lead to a desorption of chromium compounds that are probably fibre-bonded chromium-tetrathionate (sodium thiosulphate) complexes.
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