JOSEPH L. MCCARTHY 



"1. For estimation of the concentration of 

 the spent liquors from sulfite pulp mills in fresh and salt 

 waters, the Pearl-Benson method based upon a nitroso lignin 

 color reaction is in common use in the Pacific Northwest 

 region of the United States. 



"2. In an initial survey, estimations of 

 spent sulfite liquor concentrations in five water samples 

 by the Pearl-Benson method conducted in 19 Pacific North- 

 west laboratories yielded results which varied substantially 

 for the respective samples and this variation was apparently 

 caused largely by use in the several laboratories of some- 

 what different procedures for conducting the analyses." 



After conducting this Initial survey, Mr. 

 Fellcetta and I, along with eight other collaborators, 

 developed, agreed upon and published the description of 

 an Improved procedure under the title "A standarlzed 

 Pearl-Benson, or Nitroso, Method Recommended for Estimation 

 of Spent Sulfite Liquor or Sulfite Waste Liquor in Concen- 

 tration in Waters", whlcn was published in TAPPI magazine. 

 Volume 46, No. 6, June I963. Collaborators and co-authors, 

 along with Mr. Fellcetta and with me, in this work 

 were the following persons: Professor C. A. Barnes 

 and Dr. E. E. Colllas, the Department of Oceanography, 

 University of Washington, Seattle; Dr. Otto Goldschmld, 



