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Evaluation and Comparison of the Cobalt Thiocyanate and Modified Dragendorf Reagent Test Methods for Nonionic Detergents.


PB256949

Publication Date 1972
Personal Author Tabak, H. H.; Bloomhuff, R. N.; Bunch, R. L.
Page Count 47
Abstract Studies were undertaken to evaluate a modified Dragendorf reagent test method for the determination of nonionic surfactants in influents and effluents of biological wastewater treatment plants and to compare its sensitivity with that of the cobalt thiocyanate method for nonionic detergents. The WICKBOLD method is based on the precipitation of the surfactant with a modified Dragendorf reagent (K2BiI4 + BaCl2 + acetic acid). The filtered precipitate is washed with acetic acid and dissolved in ammonium tartrate solution. The bismuth from the bismuth-surfactant complex in solution is then titrated potentiometrically at pH 4 - 5 with 0.0005 N pyrrolidine dithiocarbamate solution using a platinum and calomel electrode. The cobalt thiocyanate method involves the treatment of the detergent with ammonium cobalt thiocyanate solution, chloroform extraction of the surfactant-cobalt thiocyanate complex and the spectrophotometric analysis of the complex in chloroform at 318 nm. The three nonionic surfactants used in the studies were: (1) fatty alcohol ethoxylate with 30.7 ethylene oxide units, (2) fatty alcohol ethoxylate with 10.6 ethylene oxide units, and (3) nonyl phenol ethoxylate.
Keywords
  • Water analysis
  • Detergents
  • Surfactants
  • Comparison
  • Modification
  • Industrial waste treatment
  • Precipitation
  • Solution
  • Cobalt inorganic compounds
  • Thiocyanates
  • Potentiometric analysis
  • Chemical analysis
  • Water pollution
  • Wickbold method
  • Cobalt thiocyanate
  • Water pollution detection
  • Dragendorf reagent test methods
Source Agency
  • National Environmental Research Center
  • Environmental Protection Agency Old Reports
NTIS Subject Category
  • 68D - Water Pollution & Control
  • 99A - Analytical Chemistry
Corporate Authors National Environmental Research Center, Cincinnati, Ohio. Advanced Waste Treatment Research Lab.
Document Type Technical Report
NTIS Issue Number 197622
Evaluation and Comparison of the Cobalt Thiocyanate and Modified Dragendorf Reagent Test Methods for Nonionic Detergents.
Evaluation and Comparison of the Cobalt Thiocyanate and Modified Dragendorf Reagent Test Methods for Nonionic Detergents.
PB256949

  • Water analysis
  • Detergents
  • Surfactants
  • Comparison
  • Modification
  • Industrial waste treatment
  • Precipitation
  • Solution
  • Cobalt inorganic compounds
  • Thiocyanates
  • Potentiometric analysis
  • Chemical analysis
  • Water pollution
  • Wickbold method
  • Cobalt thiocyanate
  • Water pollution detection
  • Dragendorf reagent test methods
  • National Environmental Research Center
  • Environmental Protection Agency Old Reports
  • 68D - Water Pollution & Control
  • 99A - Analytical Chemistry
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