Health Effects Research Laboratory HERL

Commercially Available Humic Acids. A large quantity of the commercially available humic acids was purchased from Fluka AG (Buch, Switzerland) by the Health Effects Research Laboratory (HERL) of the U.S. Environmental Protection Agency (USEPA), Cincinnati, Ohio. This coal-based humic substance is from West Germany. 

The remainder of the modified parfait column consisted of an MSC-1 cation-exchange and an A-162 anion-exchange bed. The elution conditions for these beds were modified to minimize contamination of eluates and to selectively desorb organic anions and cations. With the modified protocol, 20 model compounds (Table I), selected by the U.S. Environmental Protection Agency (USEPA) Health Effects Research Laboratory (HERL), were used to evaluate the recovery efficiency of the method. Recoveries were determined in the presence of 2 ppm of a humic acid supplied by HERL. 

Nesnow S. 1994. Mechanistic linkage between DNA adducts, mutations in oncogenes, and tumorigenicity of carcinogenic aromatic hydrocarbons in strain A/J mice. In Chemical mixtures and quantitative risk assessment. Abstract of the second annual HERL symposium, Nov. 7-10., Raleigh, North Carolina Health Effects Research Laboratory, U.S. Environmental Protection Agency. 

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