“Petroleum Hydrocarbons, Total Recoverable, Method 418.1 (Spectrophotometric, Infrared)”, in Methods for Chemical Analysis of Water and Wastes, EPA-600/4-79-020, United States Environmental Protection Agency, Environmental Monitoring and Support Laboratory, Office of Research and Development, Cincinnati, OH, Ed. (NTIS, Springfield, Virginia, 1983), 3rd ed., p. 493.
2.
FourmanG. L. and MullenM. V., Pharmaceutical Technol.17, 54 (1993).
