Polynuclear aromatic hydrocarbons standard reference materials

May, W.E., Brown, J.M., Chester, S.N., Guenther, F., Hilpert, L.R., Hertz, H.S., Wise, S.A. (1979) Development of an aqueous polynuclear aromatic hydrocarbon standard reference material. In Polynuclear Aromatic Hydrocarbons. Jones, P.W., Leber, P., Editors, pp. 411-418, Ann Arbor Science Publishers, Inc., Ann Arbor, Michigan. 

Standardization. Standardization in analytical chemistry, in which standards are used to relate the instrument signal to compound concentration, is the critical function for determining the relative concentrations of species In a wide variety of matrices. Environmental Standard Reference Materials (SRM s) have been developed for various polynuclear aromatic hydrocarbons (PAH s). Information on SRM s can be obtained from the Office of Standard Reference Materials, National Bureau of Standards, Gaithersburg, MD 20899. Summarized in Table VII, these SRM s range from "pure compounds" in aqueous and organic solvents to "natural" matrices such as shale oil and urban and diesel particulate materials. 

In this paper, the supercritical fluid extraction (SFE) of organic compounds from sand spiked with 36 nitroaromatic compounds, 19 haloethers, and 42 organochlorine pesticides, and from a standard reference material certified for 13 polynuclear aromatic hydrocarbons (PAH), dibenzofuran, and pentachlorophenol was examined using a two- and a four-vessel extractor. Although the results achieved by SFE for the sand and the standard reference soil samples were very encouraging, previous data obtained in our laboratory on the standard reference soil and a few other standard reference marine sediments were less favorable. It was therefore decided that an investigation of seven variables for their influence on the analyte recoveries from the standard soil sample would be useful. Two tests were conducted in which these variables were investigated. In Test 1, the seven variables selected were pressure, temperature, moisture content, cell volume, sample size, extraction time, and modifier volume. In Test 2, the seven variables were pressure, temperature, volume of toluene added to the matrix, volume of solvent in the collection vessel,... 

Analytical Methodology. An N.B.S. Standard Reference Material (SRM 1647) containing sixteen polynuclear aromatic hydrocarbons was diluted twenty-fold with methanol/methylene chloride (1 1) prior to analysis. 

May WE, Brown Thomas JM, Hilpert LR, Wise SA. The certification of selected polynuclear aromatic hydrocarbons in Standard Reference Material 1580, Organics in shale oil. In Cooke M, Dennis AJ, editors. Analytical Methods and Biological Fate of Polynuclear Aromatic Hydrocarbons. Columbus, OH Battelle Press 1981. p. 1—16. 

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