200
Anal. Chem. 1083, 55, 290-294
In addition we suggest that the separation of different aromatic compounds during the HPLC fractionation with a benzene coated stationary phase is determined by a combination of the ability of the different compounds to form 7 bonding complexes to the adsorbed benzene and hydrogen bonding to the free silanol groups.
ACKNOWLEDGMENT The skillful technical assistance of B. Christensen and B. Seitz is gratefully acknowledged. The measurements of nitrogen oxides, sulfur dioxide, and ozone were performed by B. Westerberg, Danish Air Pollution Laboratory. Registry No. Anthracene, 120-12-7; xanthene, 92-83-1; benz[a]anthracene, 56-55-3; benzo[a]pyrene, 50-32-8; benzo[ghilperylene, 191-24-2;coronene, 191-07-1;9-nitroanthracene, 602-60-8; 10-nitrobenz[a]anthracene, 13209-09-1; l-nitronaphthalene, 86-57-7; 6-nitrobenzo[a]pyrene, 63041-90-7; 9,lOdinotroanthracene, 33685-60-8; 1-nitropyrene, 5522-43-0; 1,5-dinitronaphthalene, 605-71-0. LITERATURE CITED (1) Pltts, J. N., Jr.; van Cauwenberghe, K. A.; Grosjean, D.; Schmid, J. P.; Fltz, D. R.; Belser, w, L., Jr.; Knudson, G. Hynds, p, M. science 7978, 202, 515. (2) Bronstrom, E.; Grennfelt, P.; Lindskog, A.; Sjijdin, A,; Nielsen, T. Inst. Vatten-Luftvardsforsk., [Publ.] 8 . 1982, 682. (3) Brorstrom, E.; Grennfelt, P.; Lindskog, A.; SJMin, A.; Nielsen, T. Inst. Vatten-Luftvardsforsk., [Publ.] B . 1982,682. (4) Nielsen, T.; Ramdahl, T.; Bjorseth, A. EHP, Environ. Health Perspect., In press. (5) PMs, J. N., Jr. EHP, Environ. Health Perspect., In press. (6) Wang, C. Y.; Lee. M A . ; King, C. M.; Warner, P. 0. Chemosphere 1980, 9,83. (7) Lofroth, G. “Proceedings of the Second Symposium on Application of Complex Environmental Mlxtures”; Plenum Press: New York, 1981. (8) Rosenkranz, H. S.; McCoy, E. C.; Mermelstein, R.; Speck, W. T. Mutat. Res. 1981, 9 1 , 103. (9) “Health Effects of Exposure to Diesel Exhaust”; National Academy of Sciences: Washlngton, DC, 1981;pp 21-22. (IO) Cole, J.; Arlett, C. F.; Lowe, J.; Brldges, B. A, Mutat. Res. 7982, 9 3 ,
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R~~~~~~~for review August 16, 1982. ~~~~~~~dOctober 19, 1982. This work was supported financially by the Danish Ministry of Energy. Part of the work was presented a t the 12th Symposium On the Chemistry Of Pollutants in Amsterdam April 14-16, 1982.
Preparation of Gas Cylinder Standards for the Measurement of Trace Levels of Benzene and Tetrachloroethylene William P. Schmidt” and Harry L. Rook Center for Analfllcal Chemistw, National Bureau of Standards, Washington, D.C. 20234
A procedure to prepare primary gas cylinder standards for benzene and tetrachloroethylene at trace levels (0.2-10 ppm) was developed. Gas mlxtures prepared by thls procedure were lntercompared by using gas chromatography wlth flame lonlzation detectlon (GC-FID)over a perlod of 1 year and were determlned to be stable and accurate. Mlxtures of these organics in nitrogen were generated dynamically by using gravimetrically calibrated permeation tubes, and these mixtures were compared with the gas cylinder standards to further confirm the accuracy of the preparatlve technlque.
During the past few years, the need for accurate standards containing trace levels [
