Benzo e pyrene

Individual standards of 2,3-Benzanthracene, 1,2-Benzanthracene, Triphenylene, Rubrene, Pentacene, 1,2:5,6-Dibenzanthracene, and 1,2,3,4-Dibenzanthracene were purchased from Fisher Scientific (Waltham, MA). Pyrene, Benzo(a)Pyrene, Benzo(e)Pyrene, and Perylene were obtained from Sigma Aldrich (St. Louis, MO). Chrysene was obtained from Ultra Scientific (North Kingstown, RI). All chemicals were used as received without further purification. Individual standards were diluted to a final concentration of 0.7 ng/ml in toluene (Fisher Scientific, Waltham, MA). The PAHs in Soil certified research material which contains 16 PAHs at concentrations of 100 ppb to 1 ppm was obtained from Research Technologies Corporation (SQC017, Laramie, WY). The PAH containing soil was processed using ultrasonic extraction according to EPA method 3550C. A Tuning Mix mass spectrometry standard (Tunemix, G2421A, Agilent Technologies, Santa Clara, CA) was used as a mass and mobility calibration standard. Details on the Tuning Mix structures (e.g., m/z = 322 Ko= 1.376 cm²V⁻¹s⁻¹, m/z = 622 Ko= 1.013 cm²V⁻¹s⁻¹, and m/z = 922 Ko= 0.835 cm²V⁻¹s⁻¹) and TIMS mobility calibration procedures can be found elsewhere.^{13 (link),14}